LINAC2018 - List of Keywords (linac)

Paper	Title	Other Keywords	Page
MO1A01	CSNS Front End and Linac Commissioning	MMI, DTL, rfq, cavity	1
	S. Fu, H.C. Liu, H.F. Ouyang, S. Wang IHEP, Beijing, People’s Republic of China J. Li, J. Peng CSNS, Guangdong Province, People’s Republic of China
	The China Spallation Neutron Source(CSNS) accelera-tor systems is designed to deliver a 1.6GeV, 100kW proton beam to a solid metal target for neutron scattering research. The accelerator consists of a front end, an 80MeV DTL linac, and a 1.6GeV Rapid Cycling Syn-chrotron (RCS). In August 2017 the first 1.6GeV proton beam hit on the tungsten target and production neutrons were monitored. This paper will report the major steps and results of the machine commissioning and beam commissioning of the CSNS front end and linac. In the first section, a brief introduction of the CSNS accelerator design and present status will be presented. Then, we will share our commissioning experience in the front end and the DTL linac in the following sections.
	Slides MO1A01 [9.123 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1A01
About •	paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MO1A02	An Overview of Recent Developments in SRF Technology	cavity, SRF, niobium, cryomodule	6
	R.E. Laxdal TRIUMF, Vancouver, Canada
	Superconducting Radio-Frequency (SRF) is now the technology of choice for both large and small linac projects. Several challenging projects are in progress or planned that are pushing SRF technology and/or are enabled by SRF technology. This paper gives an overview of the present status of the field.
	Slides MO1A02 [4.202 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1A02
About •	paper received ※ 16 September 2018 paper accepted ※ 31 October 2018 issue date ※ 18 January 2019
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MO2A03	Technology Developments for ELI-NP Gamma Beam System	laser, gun, electron, LLRF	13
	L. Piersanti, D. Alesini, A. Battisti, M. Bellaveglia, S. Bini, F. Cardelli, R.D. Di Raddo, A. Falone, A. Gallo, V.L. Lollo, L. Pellegrino, S. Pioli, S. Tomassini, A. Variola INFN/LNF, Frascati (Roma), Italy N. Beaugerard SEIV, Mérignac, France K. Cassou, D. Douillet, K. Dupraz, T. Le Barillec, A. Martens, C.F. Ndiaye, Y. Peinaud, Z.F. Zomer LAL, Orsay, France L. Ficcadenti, A. Mostacci, L. Palumbo, V. Pettinacci INFN-Roma, Roma, Italy M. Migliorati INFN-Roma1, Rome, Italy D.T. Palmer, L. Serafini Istituto Nazionale di Fisica Nucleare, Milano, Italy H. Rocipon ALSYOM, Argebteuil, France
	ELI-NP gamma beam system (GBS) is a linac based gamma-source in construction in Magurele (RO) by the European consortium EuroGammaS led by INFN. Photons with tunable energy, from 0.2 to 19.5 MeV, and with intensity and brilliance beyond the state of the art, will be produced by Compton back-scattering between a high quality electron beam (up to 740 MeV) and an intense laser pulse at 100 Hz repetition rate. Production of very intense photon flux with narrow bandwidth requires multi-bunch operation and laser recirculation at the interaction point. In this paper, the main technological developments carried out by the EuroGammaS consortium for the generation of the ELI-NP gamma beam will be described with a special emphasis on the electron linac technology, such as: RF-gun and C-band accelerating structures design fabrication and tests; low level RF (LLRF) and synchronization systems specifications and development. Finally, the laser recirculation apparatus design is briefly described and first results reported.
	Slides MO2A03 [9.121 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO2A03
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MO1P01	Status of the SNS Proton Power Upgrade Project	target, cryomodule, injection, operation	24
	J. Galambos, M.S. Champion, M.P. Howell, S.-H. Kim, J. Moss, M.A. Plum, B.W. Riemer, K.S. White ORNL, Oak Ridge, Tennessee, USA M. S. Connell, R. W. Steffey ORNL RAD, Oak Ridge, Tennessee, USA
	SNS plans to double the power capability of the SNS proton beam by increasing the beam energy and the beam current. Accelerator scope includes additional superconducting RF cryo-modules and supporting RF systems, and upgrades to existing RF systems. Also the accumulator storage ring and the neutron source target will be upgraded to accommodate the additional power. The technical approach, project status and plans will be discussed.
	Slides MO1P01 [6.457 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1P01
About •	paper received ※ 10 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MO1P02	Approaches to High Power Operation of J-PARC Accelerator	operation, rfq, ion-source, cavity	29
	H. Oguri JAEA/J-PARC, Tokai-mura, Japan
	Japan Proton Accelerator Research Complex (J-PARC) accelerators have been having over 10 years of operation experience. In 2006, the J-PARC linac started beam operation with an energy of 181 MeV. To realize the nominal performance of 1 MW at 3 GeV Rapid Cycling Synchrotron (RCS) and 0.75 MW at a 30 GeV Main Ring synchrotron (MR), the linac energy was upgrade to 400 MeV by adding an annular-ring coupled structure linac, and the beam current was also upgraded from 30 to 50 mA by replacing a new ion source and an RFQ. After the upgrade, the RCS demonstrated 1MW equivalent beam operation and currently operates 400 kW for the Material and Life Science Facility. The MR beam power is increasing and becomes about 480 kW beam to the Neutrino Facility and about 50 kW at the Hadron Experimental Facility. Further upgrade plan of 1.5 MW beam power from the RCS is now in consideration. To achieve the plan, it is necessary to increase by about 20 % both beam current and pulse length at the linac. The detail process in the past upgrade and the possibility for further upgrade at the linac will be presented in this talk.
	Slides MO1P02 [5.595 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1P02
About •	paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MO1P03	Status of the ESS Linac	cavity, ion-source, controls, target	35
	A. Sunesson, P. Arnold, S.L. Birch, R. Garoby, M. Jensen, M. Lindroos, C.A. Martins, A. Nordt, T.J. Shea, J.G. Weisend ESS, Lund, Sweden
	The European Spallation Source under construction in Lund (Sweden) uses a 2 GeV-5MW pulsed superconducting linac as proton driver. Normal conducting accelerating structures are used up to 92 MeV and superconducting structures up to 2 GeV. Most linac components are designed and procured as in-kind contributions by institutes/laboratories in the European partner countries. Installation of the Ion source delivered by INFN-Catania started end 2017. Installation of more components and infrastructure progresses at a high pace. Commissioning of the normal conducting linac section will take place in parallel with installation of the superconducting section. Beam commissioning of the superconducting section will be done starting in 2021, interlaced with the installation of additional high beta cryomodules. Beam will be sent to the target in 2022, initially at an energy of 1.3 GeV. Start of the User Programme is scheduled in 2023, when some neutron instruments will be ready and end of construction is in 2025, with the full set of instruments operational. This paper reports the status of linac components construction, the progress with installation on site, and the overall project schedule.
	Slides MO1P03 [14.161 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1P03
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO009	ELI-NP Gamma Beam System - Current Project Status	laser, gun, electron, experiment	59
	P.S. Tracz IFIN-HH, Bucharest - Magurele, Romania
	The Gamma Beam System at the ELI-NP under construction in Magurele/Bucharest Romania, aims at producing high brilliance gamma-rays based on the laser Compton back-scattering, up to 3.5 and 19.5 MeV out of two interaction chambers. The design of warm RF electron linac is optimized to meet the unique source specification i.e. high brilliance, small relative bandwidth, tunable energy, and high spectral density. Together with technological development in field of high energy/high quality lasers it will open new opportunities for nuclear physics research in fields like nuclear photonics, nuclear astrophysics, photo-fission, and production of exotic nuclei, applications in industry, medicine, and space science. S-band laser driven RF photo-gun and two accelerating structures constitute the injector. The beam is then accelerated by C-band linac up to 350MeV (low energy linac), and up to 720MeV (high energy linac). The GBS was designed and is being constructed by the EuroGammaS - a consortium of European academic and research institutions and industrial partners. This paper gives an overview of the facility, describes the main linac systems and summarizes the project status.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO009
About •	paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MOPO018	Development of an Improved Capture Section for the S-DALINAC Injector*	cavity, electron, simulation, gun	68
	S. Weih, M. Arnold, J. Enders, N. Pietralla TU Darmstadt, Darmstadt, Germany D.B. Bazyl, H. De Gersem, W.F.O. Müller TEMF, TU Darmstadt, Darmstadt, Germany
	For the injector of the superconducting Darmstadt electron linear accelerator S-DALINAC, the design of a new capture cavity was recently completed. This beta-reduced structure will optimize the capture of low-energy electron bunches from the gun section and therefore improve the longitudinal beam quality of the injector beam, as simulations have shown. The existing cryomodule of the injector has to be modified for the installation of the new cavity. These modifications include adaptions of the tuner frame as well as modifications of other surrounding parts. To improve the diagnostics in the low-energy section, an energy-spread measurement setup is currently also under development. In this contribution the cryomodule modifications as well as simulation results for the longitudinal beam dynamics are presented. *Work supported by DFG through GRK 2128 "AccelencE"
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO018
About •	paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MOPO024	Development of High Power Coherent Terahertz Wave Sources at Lebra 125 MeV Linac in Nihon University	FEL, electron, radiation, undulator	78
	T. Sakai, K. Hayakawa, Y. Hayakawa, K. Nogami, Y. Sumitomo, Y. Takahashi, T. Tanaka LEBRA, Funabashi, Japan H. Ogawa, N. Sei AIST, Tsukuba, Ibaraki, Japan
	Funding: This work was supported by JSPS KAKENHI Grant Number JP16K17539 and JP16H03912. Research and Development of a high performance electron linac for the generation of FEL, Parametric X-ray Radiation (PXR) and THz waves has been continued at the Laboratory for Electron Beam Research and Application (LEBRA) of Nihon University as a joint research with KEK and National Institute of Advanced Industrial Science and Technology. The transport systems of the THz wave were installed in the vacuum chamber on the downstream side of the bending magnet of the PXR and FEL beam-line. The CER and the CSR are generated by the bending magnet each of the beam line. In addition, the CTR using thin metal foil is also generated. The average power of the CTR wave was measured approximately 1 mJ/macro-pulse (pulse width 4.5 µs) near the CTR wave beam source point in the frequency range of 0.1 - 2.5 THz. In addition, the energy of the CER as high as 0.2 mJ/macro-pulse were achieved with the experimental room. Furthermore, CER of the generated the FEL beam line can also be guided from the bending magnet on the downstream side of the undulator without disturbing the FEL oscillations. THz transport beam-lines and the characteristics of the THz waves are discussed in this report.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO024
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO035	Status of CLARA Front End Commissioning	laser, GUI, cathode, MMI	98
	D. Angal-Kalinin, A.D. Brynes, S.R. Buckley, P.A. Corlett, L.S. Cowie, K.D. Dumbell, D.J. Dunning, P.C. Hornickel, F. Jackson, J.K. Jones, J.W. McKenzie, B.L. Militsyn, A.J. Moss, T.C.Q. Noakes, M.D. Roper, D.J. Scott, B.J.A. Shepherd, E.W. Snedden, N. Thompson, C. Tollervey, D.A. Walsh, T.M. Weston, A.E. Wheelhouse STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom R.J. Cash, R.F. Clarke, G. Cox, C. Hodgkinson, R.J. Smith, J.T.G. Wilson STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom K.D. Dumbell, B.J.A. Shepherd Cockcroft Institute, Warrington, Cheshire, United Kingdom
	CLARA (Compact Linear Accelerator for Research and Applications) is a Free Electron Laser (FEL) test facility under development at Daresbury Laboratory. The principal aim of CLARA is to test advanced FEL schemes which can later be implemented on existing and future short wavelength FELs. We report on the commissioning of the CLARA front end, consisting of a photoinjector and the first linac section, and merger into the existing VELA (Versatile Electron Linear Accelerator) beamline.
	Slides MOPO035 [1.870 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO035
About •	paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MOPO042	Evolutionary Many-objective Optimization Algorithm for Large-bandwidth Free-Electron-Laser Generation	electron, FEL, free-electron-laser, laser	121
	J.W. Yan, H.X. Deng SINAP, Shanghai, People’s Republic of China
	Funding: National Natural Science Foundation of China , the National Key Research and Development Program of China, the Young Elite Scientist Sponsorship Program by CAST and Ten Thousand Talent Program. X-ray free-electron lasers (XFELs) are leading-edge instruments in a wide range of research fields. Besides pursuing narrow bandwidth FEL pulses, the large-bandwidth XFEL pulses are very useful in various spectroscopy experiments, multi-wavelength anomalous diffraction, and X-ray crystallography. Overcompression operation scheme can be utilized to generate electron beams with large energy chirp which is benefit for bandwidth broadening. Recently, an evolutionary many-objective (having four or more objectives) algorithm, NSGA-III, was used to optimize the electron beam parameters in the overcompression including energy chirp, energy spread, current profile, peak current, and projected emittance. In this paper, combining with the Xie’s semianalytical estimate formula, the NSGA-III is utilized to find an optimal working point of linac by optimizing the XFEL pulse properties directly. Start-to-end numerical simulations based on the Shanghai soft X-ray Free-Electron Laser user facility parameters demonstrate that a full bandwidth of 4.75% can be generated.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO042
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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MOPO058	Industrial Electron Linear Accelerator R&D in CIAE	electron, gun, radiation, controls	124
	J.H. Yang, Y. Yang, G. Yu, Z.Q. Zeng CIAE, Beijing, People’s Republic of China Z.B. Zhu China Institute of Atomic Energy, Beijing, People’s Republic of China
	Electron linear accelerator(E-LINAC)is a vital accelerator type for accelerator applications, which widely applied in industry, agriculture and medical industry. The paper introduces R&D of industrial E-LINAC in China Institute of Atomic Energy (CIAE) , including electron gun, modulator, accelerating tube, assembling and testing. Based on these R&D results, the GT series for non-destructive testing(NDT) and FZ series for irradiation processing are developed successfully. At present these E-LINACs play important roles in pressure vessel inspection, food preservation, sterilization and material modification, promoting the E-LINACs application as well as economic development in China.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO058
About •	paper received ※ 11 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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MOPO063	Development of Side-coupled X-band Medical Linear Accelerator for Radiotherapy	cavity, electron, gun, target	139
	Y.S. Lee, Y.W. Choi, G.J. Kim, I.S. Kim, J.I. Kim, S. Kim, J.H. Lee KERI, Changwon, Republic of Korea J.H. Hwang, Y.N. Kang, A.R. Kim, J.N. Kim, T.G. Oh, Y.A. Oh, Y. J. Seol, J.S. Shin The Catholic University of Korea, Seoul, Republic of Korea
	Recently, LINAC-based radiotherapy equipment are being developed by combining with imaging devices such as CT or MRI, so that it is possible to precisely focus high dose radiation on tumor tissues while minimizing the normal tissue damage. In order to place the diagnostic and treatment devices simultaneously in a confined space, constraints related to interference and volume between the subsystems must be considered. To meet these requirements, the size and weight of the LINAC system need to be reduced, which can be achieved by applying X-band technology. For the purpose of use in IMRT based on image guided radiotherapy, we developed a 9.3 GHz X-band medical LINAC using side-coupled structure. The LINAC is designed to have the accelerating field strength of 16.8 MV/m, and the beam current transmission efficiency of 26 % at the end of accelerating cell when the supplied RF power is at 1.7 MW. Therefore, it can accelerate the electron beam up to 6.2 MeV with having about 90 mA beam current. We plan to carry out the performance test using beam diagnostics system and X-ray measurement system, and the details of design and experimental results of LINAC will be described in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO063
About •	paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MOPO064	O-Arm Mounted X-Band Linear Accelerator System for Radiotherapy	GUI, radiation, DSL, operation	142
	S. Kim, Y.W. Choi, G.J. Kim, I.S. Kim, J.I. Kim, J.H. Lee, Y.S. Lee KERI, Changwon, Republic of Korea J.H. Hwang, Y.N. Kang, A.R. Kim, J.N. Kim, T.G. Oh, Y.A. Oh, Y. J. Seol, J.S. Shin The Catholic University of Korea, Seoul, Republic of Korea
	Current advances in radiotherapy are based on the precise imaging techniques, and there is a pressing need for the development of techniques that are capable of visualizing cancer tissues in real time in conjunction with radiotherapy. Indeed, the image-guided radiotherapy systems in which conventional diagnostic tools such as CT and MRI are combined with the linear accelerator (LINAC)-based radiotherapy have been extensively studied. In this work, we mounted 9.3GHz X-band LINAC designed by KERI on the 360 degree-rotatable O-arm system, which allows efficient integration of a diagnostic tool with a radiotherapy equipment. After mounting, the X-ray profile and percentage depth dose were measured by following the quality assurance using the AAPM TG-51,142 protocol. The beam profile symmetry was estimated to be 10².4% with ±3% tolerance. The X-ray dose was also measured by rotating the O-arm to confirm the stability of the mounted X-band LINAC. As a result, the standard deviation of the X-ray dose was shown to be 0.016 while rotating. Therefore, we demonstrate the feasibility of our O-arm X-band LINAC system for use in highly effective radiotherapy with simultaneous CT image guidance.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO064
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO069	Nuclear and Mechanical Basic Design of Target for Mo-99 Production Using High Power Electron Linac	target, photon, electron, neutron	148
	A. Taghibi Khotbeh-Sara, F. Rahmani KNTU, Tehran, Iran F. Ghasemi NSTRI, Tehran, Iran H. Khalafi AEOI, Tehran, Iran M. Mohseni Kejani Shahid Beheshti University, Tehran, Iran
	Today providing enough supplies of 99mTc / 99Mo as a high usage radioisotope in diagnostic nuclear medicine for the world demand is a big challenge. One of the proofed ways to access reliable source of this radioisotopes is production using e-LINAC [1]. In this investigation it was tried to find the simple and the optimized design of 99Mo production target based on photoneutron reaction using e-LINAC. Based on the Monte-Carlo calculation for radiation transport and finite element thermal analysis, 9 thin plates of enriched 100Mo was suggested. Equal distance between plates was considered for cooling to prevent target melting. The main target includes only 100Mo in one-stage approach method to increase production rate in compare with two-stage approach [2]. Applying 2.5 m/s for inlet velocity of cooling water provides suitable cooling process with maximum temperature of target about 900 ˚C.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO069
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO070	Construction of the Side-coupled Standing-wave e-Linac	cavity, simulation, coupling, electron	151
	S. Zarei Nuclear Science and Technology Research, InstituteRadiation Application School, Tehran, Iran F. Abbasi Shahid Beheshti University, Tehran, Iran M. Bahrami, M. Lamehi IPM, Tehran, Iran F. Ghasemi NSTRI, Tehran, Iran
	Due to Iran’s growing need for accelerators in various applications, NSTRI electron linear accelerator project has been defined for medical and inspection applications. This accelerator is a 6 MeV side-coupled standing-wave that operate is π /2 mode in the frequency of 2998.5 MHz. In this paper the construction and measurement results of the tube of this accelerator are presented. The prototype tube was constructed from aluminum and was clamped with bolts. By using a network analyzer, electric and magnetic probes and a side-coupled cavity tuning method and a bead-pull measurement technique, RF measurements were carried out. The resonant frequency and quality factor have been achieved 2998.5 MHz and 7940 respectively . low-energy accelerator, construction of linac, standing-wave linac
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO070
About •	paper received ※ 12 September 2018 paper accepted ※ 09 November 2018 issue date ※ 18 January 2019
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MOPO077	Design of the High Gradient Negative Harmonic Structure for Compact Ion Therapy Linac	proton, coupling, operation, simulation	160
	S.V. Kutsaev, R.B. Agustsson, A.Yu. Smirnov, A. Verma RadiaBeam, Santa Monica, California, USA A. Barcikowski, R.L. Fischer, B. Mustapha ANL, Argonne, Illinois, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under SBIR grant DE-SC0015717 and Accelerator Stewardship Grant, Proposal No. 0000219678 A novel concept for an Advanced Compact Carbon Ion Linac (ACCIL) that will deliver up to 1 pnA of carbon ions with variable energy from 45 MeV/u to 450 MeV/u in a 45 m footprint, has been developed by Argonne National Laboratory (ANL) in collaboration with RadiaBeam. The ACCIL will have a 35 MV/m real-estate accelerating gradients that became possible to achieve with the development of novel S-band high-gradient structures, capable of providing 50 MV/m accelerating gradients for particles with β>0.3. In particular, a β=0.3 structure based on the novel approach of operation at the first negative spatial harmonic with the increased distance between the accelerating gaps will be presented. This is the first attempt to reach such high gradients at such small velocities. RadiaBeam and ANL have demonstrated the feasibility of building this structure for accelerating carbon ions by means of advanced computer simulations and are currently working towards the fabrication of this structure for high power tests.
	Slides MOPO077 [1.863 MB]
	Poster MOPO077 [0.923 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO077
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO079	Cavity Design of a 7 MeV 325 MHz Proton APF IH-DTL for a Compact Injector	cavity, DTL, proton, focusing	163
	X. Li University of Chinese Academy of Sciences, Beijing, People’s Republic of China X. Li, Y.H. Pu, X.C. Xie, M.H. Zhao SINAP, Shanghai, People’s Republic of China F. Yang Shanghai APACTRON Particle Equipment Company Limited, Shanghai, People’s Republic of China
	Funding: National Key Research and Development Program of China (grant number 2016YFC0105408) An Interdigit H-mode Drift-Tube-Linac (IH-DTL) with Alternating-Phase-Focusing (APF) method working at 325MHz was designed. With the RF field established properly in the cavity, protons can be accelerated from 3MeV to 7MeV successfully. In this paper, the process of designing such an APF IH-DTL cavity is going to be presented. Also, the characteristics of the cavity and pa-rameters studying of RF are going to be demonstrated.
	Poster MOPO079 [0.433 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO079
About •	paper received ※ 02 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO080	The Manufacturing of the CSNS DTL Tank	cavity, DTL, vacuum, factory	167
	X.L. Wu, T. Luo CSNS, Guangdong Province, People’s Republic of China L. Dong, K.Y. Gong, H.C. Liu, H. Song IHEP, Beijing, People’s Republic of China S.M. Liu DNSC, Dongguan, People’s Republic of China
	The DTL tank is a crucial component of the China Spallation Neutron Source (CSNS) linear accelerator (LINAC), which mainly use the technology of oxygen-free copper (OFC) electroplating on the inner surface of the 20# carbon steel tube. It is the first time to perform OFC electroplating with high electrical conductivity in the high intensity beam accelerator in China. In the process of cavity manufacturing, problems such as machining deformation, plating surface nodule and plating peeling are encountered. In this project, based on pre-research and information from literature, the formula of acid solution was improved to construct a stable pickling process protocol. The manufacturing process of DTL tank and the measurement details are introduced in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO080
About •	paper received ※ 10 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO084	The Simulation and Manufacture of the Room Temperature CH-DTL	cavity, impedance, DTL, rfq	177
	J.H. Li, G. Han China Institute of Atomic Energy, Beijing, People’s Republic of China C.G. Li CIAE, Beijing, People’s Republic of China Z. Li SCU, Chengdu, People’s Republic of China
	The room temperature Cross-bar H Type Drift Tube Linac (CH-DTL) is one of the candidate acceleration structures working in CW mode. In order to optimize the parameters, the 3 dimensional electromagnetic field of the CH-DTL cavity is simulated. The method of parameter sweeping with constraint variable is better than the method of parameter sweeping with only one variable during the optimization. In order to simplify the manufacture, the drift tube surface can be designed as spherical shape. The CH-DTL cavity has been manufactured and tested.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO084
About •	paper received ※ 31 August 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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MOPO085	Prototype of an Inter-digital H-mode Drift-tube Linac for Muon Linac	cavity, focusing, DTL, experiment	180
	Y. Nakazawa, H. Iinuma Ibaraki University, Ibaraki, Japan K. Hasegawa, Y. Kondo, T. Morishita JAEA/J-PARC, Tokai-mura, Japan N. Hayashizaki RLNR, Tokyo, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan Y. Iwata NIRS, Chiba-shi, Japan N. Kawamura, T. Mibe, M. Otani, T. Yamazaki, M. Yoshida KEK, Ibaraki, Japan R. Kitamura, H.Y. Yasuda University of Tokyo, Tokyo, Japan N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan Y. Sue Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
	An inter-digital H-mode (IH) drift-tube linac (DTL) is developed for a low velocity part in a muon linac at the J-PARC E34 experiment. It will accelerate muons from v/c = 0.08 to 0.28 at an operational frequency of 324 MHz. In order to achieve higher acceleration efficiency and make cost lower, an alternative phase focusing (APF) scheme is adopted. A prototype with 6 cells of 0.45 m length was manufactured. The prototype accelerates muons from v/c = 0.08 to 0.15 stage. We conducted frequency measurement and bead-pull measurement as a low-power measurement, in order to evaluate the prototype product. In this paper, the results of the low-power measurement for prototype cavity will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO085
About •	paper received ※ 10 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MOPO087	Cold Test of Hybrid RFQ Prototype	rfq, quadrupole, simulation, cavity	184
	P.Y. Yu, Y. He, C.X. Li, F.F. Wang, Z.J. Wang, B. Zhang IMP/CAS, Lanzhou, People’s Republic of China
	Hybrid RFQ is proposed as a potential good choice at the low-energy range of linear accelerator, which is combined by four-vane RFQ structure and CH-DTL structure. It has higher energy gain rate compared to conventional RFQ, and it is more compact than traditional DTL. In order to research on process exploration and RF parameters of this structure, an aluminium prototype is developed. The cold test of Hybrid RFQ prototype is completed. This paper will present the results and analysis of the test.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO087
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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MOPO088	Study on a 325 MHz HOM Drift Tube Linac	DTL, HOM, cavity, impedance	187
	L. Lu, T. He, W. Ma, C.C. Xing, L. Yang IMP/CAS, Lanzhou, People’s Republic of China
	Normally, drift tube linacs (DTL) are used following RFQ linacs for beam acceleration in middle and high beam energy region. but acceleration efficiency of DTLs is decreasing with beam energy increasing. Using resonated higher order mode (HOM) of cavity, DTL can get higher effective shunt impedance. we proposed a 325MHz DTL with TE115 mode. In this paper, the dynamics calculation and electromagnetic design of the HOM-DTL will be reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO088
About •	paper received ※ 13 September 2018 paper accepted ※ 17 October 2018 issue date ※ 18 January 2019
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MOPO089	Design Details of the European Spallation Source Drift Tube LINAC	DTL, interface, vacuum, GUI	190
	P. Mereu, M. Mezzano, C. Mingioni, M. Nenni INFN-Torino, Torino, Italy G. Cibinetto INFN-Ferrara, Ferrara, Italy F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy
	The Drift Tube Linac (DTL) of the European Spallation Source (ESS) is designed to operate at 352.2MHz with a duty cycle of 4% (3 ms pulse length, 14 Hz repetition period) and will accelerate a proton beam of 62.5mA pulse peak current from 3.62 to 90 MeV. This paper gives a detailed overview of the ESS-DTL current mechanical design, and the related driving criteria. It presents also an outlook of the main aspects of the assembly and installation, with related equipments, toolings and procedures.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO089
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO093	A Study of a Cooling Configuration for an OFHC Copper Rebuncher	cavity, simulation, pick-up, vacuum	200
	O. Mazor, M. Bukai, D. Nusbaum, J. Rodnizki Soreq NRC, Yavne, Israel E. Dyunin Ariel University, Ariel, Israel G. Ziskind Ben-Gurion University in the Negev, Beer Sheva, Israel
	Funding: Pazy Fund (Israel Atomic Energy commission) https://pazy.org.il A four gap OFHC copper rebuncher is developed at SNRC as a research study and a risk reduction for the MEBT of SARAF Phase II proton/ deuteron linac. The rebuncher is designed to bunch a 5 mA CW beam at 176 MHz. The required cavity voltage according to beam dynamics evaluation is 150 kV with a beam aperture diameter of 40 mm at a beam energy of 1.3 MeV/u with a Q value of 8000. Considering utilizing this cavity for enhancing the beam energy, the cooling configuration is explored for a cavity voltage of 300 kV, consuming 20 kW dissipated power, at a peak electric field of 16 MV/m, equivalent to the Kilpatrick limit. The electro magnetic study conducted with the CST RF simulation package was reproduced at ANSYS HFSS. The simulated dissipated power along the rebuncher for 20 kW forward power injected through the coupler port with the HFSS driven model were assigned to the ANSYS Fluent model to explore the resulted temperature map. Several evolved cooling configurations were studied, including cooling of the drift tubes. In this configuration the temperature rise along the cavity is in the range of 30 K. A detailed design of the four gap rebuncher is following this study.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO093
About •	paper received ※ 03 September 2018 paper accepted ※ 22 September 2018 issue date ※ 18 January 2019
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MOPO100	Doubly Stripped Proton Causing Vacuum Leak at Brookhaven 200 MeV H⁻ linac Complex	proton, rfq, ion-source, dipole	214
	D. Raparia, G. Atoian, T. Lehn, V. LoDestro, M. Mapes, A. McNerney, J. Ritter, A. Zelenski BNL, Upton, Long Island, New York, USA
	Doubly stripped H⁻ in the low energy beam transport are capture 180 degree apart in the RF of RFQ and accelerated to the full energies. These protons are bend in the opposite direction of H⁻ after the 200 MeV drift tube linac and caused vacuum leak. A new beam dump for these stripped protons is planned
	Poster MOPO100 [4.781 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO100
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO101	LINAC-multitool - an Open Source Java-toolkit	cavity, GUI, simulation, MMI	217
	M. Schwarz, D. Bade, J. Corbet, H. Podlech IAP, Frankfurt am Main, Germany
	Funding: Work supported by BMBF contr. No. 05P15RFRBA and HIC for FAIR Dedicating more precious time to advanced research instead of spending it towards timeconsuming routine tasks is a desirable goal in particle accelerator simulation and development. Requirements engineering was started at IAP in order to identify routine processes at our institute’s R&D that can be automated or simplified. Results indicated that there were several areas to consider: Bead pull measurements, data processing and visualization for the beam dynamics code LORASR, CST field map processing for the use with TraceWin, conversion between different particle distribution data formats and more. Subsequently development of the LINAC-Multitool started to rationalize these processes and replace preexisting scripts also to ensure consistency of results and increase transparency and reliability of computation. In order to guarantee maintainability, expandability and platform independence, LINAC-Multitool is programmed using Java and will be open source. This contribution presents the current state of development.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO101
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO106	New Digital LLRF System for HIT	controls, cavity, LLRF, feedback	227
	E. Feldmeier, Th. Haberer, A. Peters HIT, Heidelberg, Germany
	The Heidelberg Ion Therapy Center HIT is in clinical operation since 2009. The accelerator complex consists of a linear accelerator and a synchrotron to provide carbon ions and protons for clinical use as well as helium and oxygen ions. The analog LLRF system for the linac should be replaced after more than 10 years of continuous operation. In its life-time the LLRF caused no interruption of the clinical operation with a downtime of more than 15 minutes. In order to keep the reliability in the next 10 years at least as high, a new digital LLRF system is planned. Further difficulties for the installation of a new system are due to the clinical full time usage of the accelerator and the short maintenance slots of only two days in series.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO106
About •	paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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MOPO107	Performance Evaluation of the RF Reference Phase Stabilization System on Fiber-optical Link for KEK e⁻/e⁺ Injector LINAC	feedback, controls, EPICS, FPGA	230
	N. Liu, B. Du Sokendai - Hayama, Hayama, Japan D.A. Arakawa, H. Katagiri, T. Matsumoto, S. Michizono, T. Miura, F. Qiu, Y. Yano KEK, Ibaraki, Japan T. Matsumoto, T. Miura, F. Qiu Sokendai, Ibaraki, Japan
	KEK e⁻/e⁺ injector is the 600 m J-shaped LINAC which has 8 RF sectors. Stabilization of RF phase reference for long distance transmission is necessary for stable RF operation. In the present system, single-mode fiber-optical links without feedback control are used from sector 2 to 5. For the SuperKEKB, the phase stability requirement is within 0.1 deg. rms. The more stable RF phase reference is necessary to improve the phase stability. In this paper, a feedback control system for RF reference phase stabilization is tested for system performance evaluation. The temperature and humidity characteristics of the electric and optical components and phase stabilized optical fiber (PSOF) with different wavelengths will also be presented.
	Poster MOPO107 [2.026 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO107
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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MOPO111	Development of New LLRF System at the J-PARC Linac	LLRF, FPGA, low-level-rf, feedback	233
	K. Futatsukawa, Z. Fang, Y. Fukui KEK, Ibaraki, Japan Y. Sato Nippon Advanced Technology Co., Ltd., Tokai, Japan S. Shinozaki JAEA/J-PARC, Tokai-mura, Japan
	In the J-PARC linac, the LLRF system with the digital feedback (DFB) and the digital feedforward (DFF) was adopted for satisfying requirement of amplitude and phase stabilities. It has been operated without serious problems. However, it has been used since the beginning of the J-PARC and more than ten years have already passed since the development. The increase of the failure frequency for this system is expected. Additionally, it is difficult to maintain it for some discontinued boards of DFB and DFF and the older developing environment of software. Therefore, we are starting to study the new LLRF system of the next generation. In the present, we are exploring several possibilities of a new way and investigating each advantage and disadvantage. The project and the status of the development for the new system in the J-PARC linac LLRF are introduced.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO111
About •	paper received ※ 22 September 2018 paper accepted ※ 09 November 2018 issue date ※ 18 January 2019
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MOPO118	Optimized Design for a Compact Linac with Collinear Absorbing Loads at the Hust FEL-THz	cavity, FEL, radiation, electron	242
	J. Jiang, G. Feng, T. Hu, Y. Lu, X.D. Tu, Y.Q. Xiong HUST, Wuhan, People’s Republic of China Y.J. Pei USTC/NSRL, Hefei, Anhui, People’s Republic of China
	To meet the requirement of miniaturization for high power THz radiation in the field of commercial and civil use, RF Linacs have been applied widely as beam injectors, and the Linac with collinear absorbing loads reveals the potential to achieve a tradeoff between performance and compactness. Under overall consideration of systematic conflicts, optimization choices for such Linacs involving power absorbing ability, accelerating efficiency, as well as beamline length were described in this context. Meanwhile, cold testing has been conducted to verify design parameters for the collinear absorbing loads. Furthermore, elaborated calculation of thermal power loss and integrated helical water channel cooling has been performed for the 14MeV Linac with collinear absorbing loads installed on the HUST FEL-THz, and online experiments demonstrated that both the accelerating efficiency and the water cooling performance fulfilled operation demands.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO118
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO120	Improvement of the Linear Part in the Tuner System of ADS 25 MeV Linac	experiment, proton, cavity, superconducting-cavity	250
	L. Zhang, Z. Gao, L.B. Liu, F.F. Wang, B. Zhang IMP/CAS, Lanzhou, People’s Republic of China
	Tuner system is the indispensable part of ADS high current proton superconducting linac. It influences the working frequency of superconducting cavity of particle accelerator. To completely understand the working situa-tion of the tuner system and analyses the problems existing in it, experiments of linear part were fully conducted.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO120
About •	paper received ※ 09 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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MOPO124	Details of the Manufacturing Processes of the ESS-DTL Components	DTL, alignment, coupling, vacuum	260
	P. Mereu, F. Borotto Dalla Vecchia, C. Mingioni, M. Nenni, R. Panero INFN-Torino, Torino, Italy A. Battistello, P. Bottin, D. Conventi, L. Ferrari, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy A.G. Colombo INFN- Sez. di Padova, Padova, Italy
	The Drift Tube Linac (DTL) of the European Spallation Source (ESS) is designed to operate at 352.2MHz with a duty cycle of 4% (3 ms pulse length, 14 Hz repetition period) and will accelerate a proton beam of 62.5mA pulse peak current from 3.62 to 90 MeV. This paper presents the details of the manufacturing processes with quality control reports of the components of the DTL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO124
About •	paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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TU1A01	Challenges in Superconducting Accelerating Module Design and Construction for High Power Proton Accelerators	cryomodule, cavity, vacuum, alignment	280
	C. Madec CEA/DSM/IRFU, France
	CEA is engaged in the construction of the IFMIF, SARAF and ESS superconducting linacs and in particular in the design and production of a their accelerating cryomodules: 1 low-beta half-wave 176 MHz resonators for IFMIF, 4 low-beta half-wave 176 MHz resonators for SARAF and 30 medium and high-beta elliptical cavity resonators for ESS. The developments of these RF cryomodules, although at various stages, are led in parallel by the cryomodule team at CEA-Saclay, including all RF, mechanical, thermal, cryogenic, integration and QA-QC aspects in a global approach which attempts to optimise synergies and lessons learnt between these projects. A status report will be presented describing the common approaches and methods, and the systemic particularities of each project.
	Slides TU1A01 [11.896 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU1A01
About •	paper received ※ 14 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019
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TU1A03	Status and Issues (Microphonics, LFD, MPS) with TRIUMF ARIEL e-Linac Commissioning	cavity, TRIUMF, MMI, electron	286
	S.R. Koscielniak, M. Alcorta, F. Ames, E. Chapman, K. Fong, B. Humphries, O.K. Kester, D. Kishi, R.E. Laxdal, Y. Ma, T. Planche, M. Rowe, S.D. Rädel, V.A. Verzilov, Z.Y. Yao TRIUMF, Vancouver, Canada
	The ARIEL electron linac (e-linac) is designed to generate cw beams of up to 30 MeV and 10 mA for delivery to a photo-convertor. Bremsstrahlung induced fission of a production target yields neutron-rich rare isotope beams to be supplied to the ISAC experimental facilities. The beam power will eventually reach 300 kW, and a machine protection system (MPS) with 10 μs rapidity is essential. The e-linac, which adopts 1.3 GHz, 2K SRF technology, is composed of a 10 MeV single-cavity injector cryomodule (EINJ) and a 20 MeV two-cavity accelerator cryomodule (EACA). The latter has vector-sum control of two cavities driven from a single klystron. Beam commissioning of these systems is ongoing since 2016. The magnetic optics and MPS commissioning to 10 MeV is reported herein. Beam has been accelerated up to 25 MeV, and thread-ed to the high energy dump (EHD). A campaign to investigate microphonics driving terms, LN2 disturb-ances, and a ponderomotive instability in the EACA, is underway.
	Slides TU1A03 [9.683 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU1A03
About •	paper received ※ 17 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TU1A05	Seamless Quarter Wave Resonators for HIE ISOLDE	cavity, ISOL, niobium, cryomodule	292
	W. Venturini Delsolaro, A. Miyazaki CERN, Geneva, Switzerland
	The HIE-ISOLDE post accelerator consists of 4 cryomodules with 5 niobium-coated Quarter Wave Reso-nators (QWR) each. The standard manufacturing tech-nique was to machine the inner and outer conductor sepa-rately, to shrink-fit the 2 pieces and to apply an electron beam welding at the interface. Due toμcracks, ob-served on some of the cavities around the welds, we took the decision to explore the possibility of a seamless de-sign. First cavities became available in late 2017 and were then cold-tested in the vertical cryostat. These seam-less coated quarter wave resonators have shown some of the highest Q-values of all HIE-ISOLDE cavities in the acceptance tests. Furthermore, we studied the cavity per-formance with different compensations of the earth mag-netic field and different temperature gradients upon cool down. These tests have demonstrated record-breaking RF surface fields for the Nb/Cu technology. This paper re-views the design and fabrication and reports on the cold tests results of seamless quarter wave resonators, and of possible future applications
	Slides TU1A05 [30.518 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU1A05
About •	paper received ※ 11 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019
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TU2A01	First Acceleration of Heavy Ion Beams with a Superconducting Continuous Wave HIM/GSI CW-linac	cavity, heavy-ion, acceleration, emittance	297
	W.A. Barth, K. Aulenbacher, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu HIM, Mainz, Germany K. Aulenbacher IKP, Mainz, Germany W.A. Barth, M. Heilmann, A. Rubin, A. Schnase, S. Yaramyshev GSI, Darmstadt, Germany M. Basten, M. Busch, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany
	First acceleration of heavy ion beams with a superconducting continuous wave HIM/GSI CW-Linac After successful RF-testing of a new superconducting Linac RF-cavity at GSI Helmholtzzentrum für Schwerionenforschung and a short commissioning and ramp up time of some days, this 15-gaps Crossbar H-cavity accelerated first time heavy ion beams with full transmission up to the design beam energy. The design acceleration gain of 3.5 MV inside a length of less than 70 cm has been verified with heavy ion beam of up to 1.5 particle mkA. The measured beam parameters show a nice beam quality. The machine commissioning with beam is a milestone of the R&D work of Helmholtz Institute Mainz and GSI in collaboration with Goethe University Frankfurt in development of the superconducting heavy ion continuous wave linear accelerator CW-Linac.
	Slides TU2A01 [3.385 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU2A01
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TU2A04	Progress Report on LIPAC	rfq, MMI, SRF, cavity	308
	M. Sugimoto, T. Akagi, T. Ebisawa, Y. Hirata, R. Ichimiya, A. Kasugai, K. Kondo, S. Maebara, K. Sakamoto, T. Shinya QST, Aomori, Japan P. Abbon, N. Bazin, B. Bolzon, N. Chauvin, S. Chel, R. Gobin, J. Marroncle, B. Renard CEA/IRFU, Gif-sur-Yvette, France L. Antoniazzi, L. Bellan, D. Bortolato, M. Comunian, E. Fagotti, F. Grespan, M. Montis, A. Palmieri, A. Pisent, F. Scantamburlo INFN/LNL, Legnaro (PD), Italy P.-Y. Beauvais, H. Dzitko, D. Gex, R. Heidinger, A. Jokinen, I. Moya, G. Phillips Fusion for Energy, Garching, Germany P. Cara IFMIF/EVEDA, Rokkasho, Japan D. Gavela, D. Jiménez-Rey, I. Kirpitchev, J. Mollá, P. Méndez, I. Podadera, D. Regidor, R. Varela, M. Weber CIEMAT, Madrid, Spain J. Knaster F4E, Barcelona, Spain G. Pruneri Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova, Italy
	International Fusion Materials Irradiation Facility (IFMIF) is the neutron source for simulating fusion reactor environment using two 40 MeV/125 mA CW D⁺ beams. LIPAc facility is under construction in Rokkasho for validating 9 MeV/125 mA CW linac technology as a prototype of the IFMIF accelerator. Commissioning of 5 MeV CW RFQ is underway after the completion of installation of RFQ, MEBT, diagnostic plate. low power beam dump, RF power system and their auxiliaries. As the first step, high power RF conditioning is planned to complete in early 2018 and beam commissioning will start with stepwise approach at the same time. The status of LIPAc construction for preparing 9 MeV acceleration and results of RFQ beam commissioning are presented.
	Slides TU2A04 [9.651 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU2A04
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO001	About the Limits for the Accelerated Beam Current in the LUE-200 Linac of the IREN Facility	klystron, electron, neutron, acceleration	320
	A.P. Sumbaev JINR, Dubna, Moscow Region, Russia A.M. Barnyakov, A.E. Levichev BINP SB RAS, Novosibirsk, Russia
	The beam current loading of the accelerating fields is discussed for the linear accelerator LUE-200 of IREN facility. LUE-200 electron Linac consits of two disk loaded travelling wave accelerating structure with the operating frequency of 2856 MHz and power compression SLED-type system. The limits by the accelerated beam current are defined for different pulse durations of the beam current and RF power. The calculated results are discussed and compared with the measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO001
About •	paper received ※ 12 September 2018 paper accepted ※ 22 January 2019 issue date ※ 18 January 2019
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TUPO003	Development of CW Heavy Ion Linac at IMP	DTL, MMI, cavity, rfq	326
	X. Yin, H. Du, Y. He, Q.Y. Kong, X.N. Li, Z.S. Li, L.Z. Ma, J. Meng, C. Qian, L.T. Sun, K.D. Wang, J.X. Wu, J.W. Xia, W.J. Xie, Z. Xu, Y.Q. Yang, Q.G. Yao, Y.J. Yuan, W. Zhang, X.Z. Zhang, Y. Zhang, H.W. Zhao, Z.Z. Zhou IMP/CAS, Lanzhou, People’s Republic of China J.E. Chen, S.L. Gao, G. Liu, Y.R. Lu, Z. Wang, X.Q. Yan, K. Zhu PKU, Beijing, People’s Republic of China
	A new heavy ion linac as the injector for the Separated Sector Cyclotron (SSC), named SSC-Linac[1], is being under constructed at the national laboratory Heavy Ion Research Facility in Lanzhou (HIRFL). The SSC-Linac mainly consists of a 4-rod RFQ and three IH-DTL cavities which can accelerate ion of A⁄q≤7from 3.73 keV/u to 1.025 MeV/u. Both of themoperating at 53.667MHz had been developed. In the commissioning, ions weresuccessfully accelerated to 0.295MeV/u by IH-DTL1. The beam commissioningof the IH-DTL2 which can accelerate the ion to 0.586MeV/u will come soon. In this paper, the recent R&D progress of the SSC-Linac including the development of key components and the beam commissioning results arepresented.
	Slides TUPO003 [7.335 MB]
	Poster TUPO003 [0.810 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO003
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO004	RF Design and Cold Model Measurement of an IH-DTL for HIMM Injector	DTL, cavity, simulation, quadrupole	329
	H. Du, Q.Y. Kong, Z.S. Li, K.D. Wang, X. Yin IMP/CAS, Lanzhou, People’s Republic of China
	An interdigital H-mode drift tube linac (IH-DTL) will be constructed as a postinjector linac for the Heavy Ion Medical Machine (HIMM). Its resonant frequency, injec-tion and final energies are determined from beam dynamics and hardware parameters considerations of the entire machine to be 162.5MHz, 600keV/u and 4MeV/u, respectively. The beam duty cycle of the injector linac is less than 0.1% based on the injection requirements of the synchrotron. Beam dynamics and RF structure design and optimize of the IH-DTL has been finished. The maximum surface electric field is less than 2.0-times the Kilpatric limit for accelerating C⁴⁺ beam. This IH-DTL contains 42 accelerating gaps and two focusing quadrupole triplets. In order to examine the field distribution of the IH-DTL which reaches the length of 3.17m, an aluminum alloy 1:1 cold model cavity with 4 moveable tuners and 2 empty focusing magnet shell was constructed. The relative intertube-distance errors are less than ±50μm. The measurements show that the gap voltage values can match the CST-MWS simulating results within relative difference of ±3% by adjusting the 4 moveable tuners.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO004
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO012	Compact Multipurpors Facility - BELA	rfq, neutron, ion-source, ECR	349
	T. Kulevoy, R. Fatkullin, A.V. Kozlov, G. Kropachev, D.N. Selesnev, A.I. Semennikov, A. Sitnikov ITEP, Moscow, Russia T. Kulevoy MEPhI, Moscow, Russia T. Kulevoy NRC, Moscow, Russia
	In ITEP the project of multidiscipline facility Based on ECR ion source and Linear Accelerator (BELA) is started. The injector part of facility is based on combinations of ECR ion source and dc H⁺ and He⁺ source will provide the multi beams irradiation of the reactor materials for modeling experiments. The cw RFQ and following DTL will enable the set of experimental activity both for fun-damental physics and for practical applications.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO012
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO013	Commissioning Status of the LIGHT Development Machine	MMI, rfq, DTL, proton	352
	G. De Michele, J. Adam, D. Aguilera Murciano, A. Benot-Morell, R. Bonomi, F. Cabaleiro Magallanes, M. Caldara, G. D’Auria, A. Degiovanni, M. Esposito, S. Fanella, D. Fazio, D.A. Fink, Y. Fusco, M. Gonzalez, P. Gradassi, L. Kobzeva, G. Levy, G. Magrin, A. Marraffa, A. Milla, R. Moser, P. Nadig, G. Nuessle, A. Patino-Revuelta, T. Rutter, F. Salveter, A. Samoshkin, L. Wallet A.D.A.M. SA, Meyrin, Switzerland M. Breitenfeldt, C. Candolfi, G. Castorina, M. Cerv, V.A. Dimov, M.T. Gallas, S. Gibson, A. S. Gonzalez, Ye. Ivanisenko, A. Jeff, V. F. Khan, S. Magnoni, J.L. Navarro Quirante, H. Pavetits, P. Paz Neira, S.G. Soriano, P. Stabile, K. Stachyra, A. Valloni, C. Zannini AVO-ADAM, Meyrin, Switzerland G. D’Auria Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
	ADAM (Application of Detectors and Accelerators to Medicine) is a CERN spin-off company currently working on the construction and testing of the LIGHT (Linac for Image-Guided Hadron Therapy) machine. LIGHT is an innovative high-frequency linac based proton therapy system designed to accelerate protons up to 230 MeV: it consists of three different linac sections i.e. a 750 MHz Radio Frequency Quadrupole (RFQ) accelerating the beam up to 5 MeV; a 3 GHz Side Coupled Drift Tube Linac (SCDTL) up to 37.5 MeV; and a 3 GHz Coupled Cavity Linac (CCL) section up to 230 MeV. The compact and modular design is based on cutting edge technologies developed for particle colliders and adapted to the needs of hadron therapy beams. The LIGHT development machine is currently being built at CERN and this paper describes its design aspects and its different stages of installation and commissioning.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO013
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO014	TRIUMF ISAC LINAC Developments and Upgrades	controls, ISAC, operation, TRIUMF	355
	Z.T. Ang, T. Au, Y. Bylinskii, K. Fong, J.J. Keir, D. Lang, R.E. Laxdal, R. Leewe, B.S. Waraich, Z.Y. Yao, Q. Zheng, V. Zvyagintsev TRIUMF, Vancouver, Canada
	TRIUMF ISAC accelerator complex is in consists of ISAC-I room temperature linac and ISAC-II superconducting linac structure. ISAC-I linac has seventeen RF systems in operation for about twenty years, and ISAC-II linac has forty superconducting QWR RF cavities in operation for more than ten years. A small ISAC booster 3-gap structure at 11.78 MHz located in upstream of RFQ has been designed and installed for energy matching to RFQ. A sliding mode extremum seeking control for LLRF control was developed and implemented in operation. Six of DTL systems have been working in the control mode. Two of them had been commissioning and in operation one and half year reliably. RFQ, two more DTL system, HEBT rebuncher and DSB buncher system will be upgraded in the sliding mode control soon. Twenty ISAC-II SBC superconducting cavity RF power amplifiers were upgraded from YV-229 triode tube amplifier into solid state amplifier(SSA). The prototype and four SSAs have been commissioned in 2017 and in operation successfully. The rest of 16 SSA have been tested in RF lab and installed for operation at the mid of this year.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO014
About •	paper received ※ 04 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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TUPO017	The New Light Ion Injector for NICA	cavity, diagnostics, LLRF, rfq	362
	B. Koubek, M. Basten, H. Höltermann, H. Podlech, U. Ratzinger, A. Schempp, R. Tiede BEVATECH, Frankfurt, Germany A.V. Butenko, D.E. Donets, B.V. Golovenskiy, A. Govorov, K.A. Levterov, D.A. Lyuosev, A.A. Martynov, V.A. Monchinsky, D.O. Ponkin, K.V. Shevchenko, I.V. Shirikov, E. Syresin JINR, Dubna, Moscow Region, Russia C. K. Kampmeyer, H. Schlarb DESY, Hamburg, Germany
	Within the upgrade scheme of the injection complex of the NICA project and after a successful beam commissioning of a heavy ion linac, Bevatech GmbH will build a first part of a new light ion linac as an injector for the Nuclotron ring. The linac will provide a beam of polarised protons and light ions with a mass to charge ratio up to 3 and an energy of 7 MeV/u. The mandate of the Linac does not only include the hardware for the accelerating structures, focusing magnets and beam diagnostic devices, but also the LLRF control soft- and hardware based on the MicroTCA.4 standard in collaboration with the MicroTCA Technology Lab at DESY. An overview of the Linac is presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO017
About •	paper received ※ 10 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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TUPO020	Microphonics Investigation of ARIEL e-Linac Cryomodules	cavity, cryomodule, pick-up, damping	370
	Y. Ma, K. Fong, M. Keikha, J.J. Keir, D. Kishi, S.R. Koscielniak, D. Lang, R.E. Laxdal, R.R. Nagimov, Z.Y. Yao, Q. Zheng, V. Zvyagintsev TRIUMF, Vancouver, Canada L. Lilje DESY, Hamburg, Germany
	Now the stage of the 30MeV portion of ARIEL (The Advanced Rare Isotope Laboratory) e-Linac is under commissioning which includes an injector cryomodule (ICM) and the 1st accelerator cryomodule (ACM1) with two cavities configuration. In this paper, the progress of the microphonics investigation and suppression of ICM and ACM1 is presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO020
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO022	Manufacturing of X-band Accelerating Structures: Metrology Analysis and Process Capability	controls, GUI, collider, linear-collider	374
	J. Sauza-Bedolla, S. Atieh, N. Catalán Lasheras CERN, Geneva, Switzerland
	The fabrication tolerances of RF components are essential for CLIC X-band accelerating structures to perform efficiently. On one hand, the capability of high power accelerating structures depends on the shape accuracy and the asperity of the inner surfaces, when microwaves pass through the cavity. On the other hand, surface flatness and dimensional tolerances are necessary to guarantee a correct assembly process. Hence, the discs that build up the structure require sub-micrometre specifications and, in order to meet all the needs, ultra-precision machining using single crystal diamond tools is mandatory. This paper shows the analysis of the metrology results of the fabrication of 118 discs (4 accelerating structures). Dimensional and form tolerances are studied following the production order to find drifts in the production and to predict the impact on the assembly process. Finally, process capability is evaluated.
	Poster TUPO022 [2.987 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO022
About •	paper received ※ 10 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO023	Preserving Micron Tolerances Through the Assembly Process of an X-band Accelerating Structure	cavity, simulation, HOM, software	377
	J. Sauza-Bedolla, N. Catalán Lasheras, A. Grudiev, S. Lebet, E. Rodriguez-Castro, P. Sobrino-Mompean, A. Solodko, K. T. Szypula CERN, Geneva, Switzerland H. Bursali IZTECH, Izmir, Turkey
	The CLIC structures are designed for operating at X-Band, 2π/3 traveling wave mode with a loaded 100 MV/m gradient. Mechanical tolerances, at the submicron level, are required to satisfy the RF design constraints and beam dynamics and are reachable using ultra-precision diamond machining. However, inherent to the manufacturing process, there is a deviation from the nominal specifications and as a result; incorrect cavity dimensions produce a less efficient linac. Moreover, the assembly process increase the difference from the original geometry. As part of a cost and manufacturability optimization of the structures for mass production, this study aims to identify a correlation between frequency deviations and geometrical errors of the individual discs of the accelerating structures caused by the production process. A sensitivity analysis has been carried out to determine the most critical parameters. Cell frequency deviations have been monitored by bead pull measurements before and after bonding. Several accelerating structure prototypes have been tested to determine our assumptions and to assess if the assembly process preserves the tight tolerances achieved by machining.
	Poster TUPO023 [1.443 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO023
About •	paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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TUPO028	Retreatment of European XFEL Series Cavities at DESY as Part of the Repair of European XFEL Accelerating Modules	cavity, FEL, vacuum, SRF	384
	S. Sievers, N. Krupka, D. Reschke, S. Saegebarth, J. Schaffran, M. Schalwat, P. Schilling, M. Schmökel, N. Steinhau-Kühl, E. Vogel, H. Weise, B. van der Horst DESY, Hamburg, Germany M. Wiencek IFJ-PAN, Kraków, Poland
	For the European XFEL 10² accelerating modules were built and tested. Several accelerating modules had to be reworked due to different kinds of non-conformities. The extent of this rework varied greatly. At the end of production four accelerating modules could not be qualified in time before the tunnel installation was to be finished in September 2016. Meanwhile the cavity strings of two of these accelerating modules have been disassembled in the DESY clean room. The cavities have been retreated at DESY either by additional high pressure water rinsing or BCP flash chemical treatment. All cavities were vertically tested and 15 out of 16 were qualified for the reassembly of the cavity strings. One accelerating module will be reassembled completely and tested until the end of 2018; the other will follow in the first half of 2019. We report on retreatment procedures and performance of these cavities.
	Poster TUPO028 [1.662 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO028
About •	paper received ※ 11 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO030	Precise Evaluation of Characteristic of the Multi-layer Thin-film Superconductor Consisting of NbN and Insulator on Pure Nb Substrate	cavity, superconducting-RF, radio-frequency, SRF	391
	R. Katayama, Y. Iwashita, H. Tongu Kyoto ICR, Uji, Kyoto, Japan C.Z. Antoine CEA/IRFU, Gif-sur-Yvette, France A. Four CEA/DRF/IRFU, Gif-sur-Yvette, France H. Hayano, T. Kubo, T. Saeki KEK, Ibaraki, Japan H. Ito Sokendai, Ibaraki, Japan R. Ito, T. Nagata ULVAC, Inc, Chiba, Japan H. Oikawa Utsunomiya University, Utsunomiya, Japan
	In recent years, it has been pointed out that the maximum accelerating gradient of a superconducting RF cavity can be pushed up by coating the inner surface of the cavity with a multilayer thin-film structure that consists of alternating insulating and superconducting layers. In this structure, the principal parameter that limits the performance of the cavity is the critical magnetic field or effective Hc1 at which vortices start penetrating into the superconductor layer, and it is predicted to depend on the combination of the film thickness. We made samples that have NbN/SiO2 thin-film structure on pure Nb substrate with several thicknesses of NbN film deposited using DC magnetron sputtering method. Here, we report the measurement results of effective Hc1 of the NbN sample with a thickness of 200 nm by using the third-harmonic voltage method. In addition, we report the preliminary results to evaluate the dependence of the effective Hc1 on the thickness of the NbN film in the range 50 nm-200 nm.
	Slides TUPO030 [0.305 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO030
About •	paper received ※ 18 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO032	First Test Results of Superconducting Twin Axis Cavity for ERL Applications	cavity, HOM, SRF, operation	398
	H. Park, S.U. De Silva, J.R. Delayen ODU, Norfolk, Virginia, USA A. Hutton, F. Marhauser, H. Park JLab, Newport News, Virginia, USA
	Superconducting cavities with two beam pipes had been proposed in the past for energy recovery linac applications. The relatively complex geometry of those cavities presented a serious challenge for fabrication and surface processing. Main concerns have now been overcome with the production and successful RF testing of a new elliptical twin-axis cavity proposed by Jefferson Lab and optimized by the Center for Accelerator Science at Old Dominion University in the frame of a DoE accelerator stewardship program. The cavity design provides uniform accelerating or decelerating fields for both beams. This paper describes the cavity design, fabrication experience, and the first cold RF test results and explores potential applications especially for Jefferson Lab s EIC (JLEIC).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO032
About •	paper received ※ 20 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO039	Tests of the Balloon Single Spoke Resonator	cavity, multipactoring, TRIUMF, simulation	417
	Z.Y. Yao, J.J. Keir, D. Kishi, D. Lang, R.E. Laxdal, H. Liu, Y. Ma, B. Matheson, B.S. Waraich, Q. Zheng, V. Zvyagintsev TRIUMF, Vancouver, Canada
	A balloon variant of the single spoke resonator (SSR) has been designed, fabricated and tested. The cavity is the SSR1 prototype for the Rare Isotope Science Project (RISP) in Korea. It is specifically designed to reduce the likelihood of multipacting barriers near the operating point. A systematic multipacting study leads to a novel geometry, a spherical cavity with re-entrant irises and a spoke. Other than eliminating multipacting around operational gradient, the balloon shape also provides competitive RF parameters and robust mechanical structure. Cryostat cold tests demonstrated cavity performance on each design aspect. The cold tests will be reported in this paper.
	Slides TUPO039 [25.279 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO039
About •	paper received ※ 17 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO045	Optimization of Dual Axis Asymmetric Cavity for Energy Recovery Linac	cavity, HOM, coupling, SRF	435
	Ya.V. Shashkov, A.M. Bulygin, M. Gusarova MEPhI, Moscow, Russia I.V. Konoplev JAI, Oxford, United Kingdom F. Marhauser JLab, Newport News, Virginia, USA A. Seryi SLAC, Menlo Park, California, USA
	Funding: The reported study was funded by RFBR according to the research project № 18-302-00990 Optimization of the dual axis asymmetric cavity was performed to minimize the ratio of the peak magnetic and electric fields values to the accelerating voltage, to increase the distance between operating and neighbouring modes as well as to reduce the manufacturing cost of the cavity. To reach the goals several solutions have been suggested bringing the ratios to the acceptable values and leading to simplification of the manufacturing of the structure.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO045
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO055	Next Generation Nb3Sn SRF Cavities for Linear Accelerators	cavity, operation, SRF, site	462
	R.D. Porter, D.L. Hall, M. Liepe, J.T. Maniscalco Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA T. Arias, P. Cueva, D.A. Muller, N. Sitaraman Cornell University, Ithaca, New York, USA
	Niobium-3 Tin (Nb3Sn) is a very promising alternative material for SRF accelerator cavities. The material can achieve higher quality factors, higher temperature operation and potentially higher accelerating gradients (~ 96 MV/m) compared to conventional niobium. This material is formed by vaporizing Sn in a high temperature vacuum furnace and letting the Sn absorb into a Nb substrate to form a 2-3 um Nb3Sn layer. Current Nb3Sn cavities produced at Cornell achieve Q ~ 10¹⁰ at 4.2 K and 17 MV/m. Here we present a summary of the current performance of Nb₃Sn cavities at Cornell and recent progress in improving the accelerating gradient.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO055
About •	paper received ※ 20 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO058	Cool Down Studies for the LCLS-II Project	cavity, network, SRF, cryomodule	470
	M. Ge, M. Liepe Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA D. Gonnella SLAC, Menlo Park, California, USA J. Sears Cornell University, Ithaca, New York, USA
	The quality factor of the nitrogen-doped SRF cavities for the LCLS-II project are strongly impacted by cool down speed. A sufficiently fast cool down speed can produce large thermal gradient across a cavity and sufficiently expel magnetic flux when the cavity wall passes from the normal-conducting to the superconducting state. However, instrumentation in LCLS-II production cryomodules has been kept at a minimum, and additional information during the cool down of the modules is therefore desirable. In this work, we study if and how RF data can be used during cavity cool-down to determine the transition speeds of the individual cavities in the LCLS-II linac.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO058
About •	paper received ※ 19 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO079	Numerical and Experimental Study of H⁻ Beam Dynamics in J-PARC LEBT	rfq, MMI, emittance, solenoid	519
	T. Shibata, K. Ikegami, Y. Liu, K. Ohkoshi, M. Otani J-PARC, KEK & JAEA, Ibaraki-ken, Japan A. Miura, H. Oguri, K. Shinto JAEA/J-PARC, Tokai-mura, Japan F. Naito, K. Nanmo, A. Takagi KEK, Tokai, Ibaraki, Japan
	Negative hydrogen ion (H⁻) beam dynamics in J-PARC Low Energy Beam Transport (LEBT) has been investigated by numerical modeling which calculates particle transport with effect of space charge and collision processes. Understandings of H⁻ beam transport in LEBT is important for high transmission rate from Ion Source (IS) to Radio Frequency Quadrupole (RFQ) in J-PARC in higher beam current in future. In 2017, 45 mA beam current of H⁻ has been extracted from IS in J-PARC user operation which has been increased from 30 mA in last 2 years. The beam current is planned to be increased to 50 mA in the next upgrade. As the beam current increase, IS/LEBT commissioning becomes more difficult because of the higher space charge (SC). Especially in J-PARC, vacuum pressure is around 10^-5 Pa by 15 mmf orifice located in the center of LEBT. The orifice prevents residual gas injection from IS to LEBT/RFQ and thus produces stronger SC effect. In the presentation, numerical results are compared with actual results from J-PARC Linac beam commissioning. A comparison of the results shows that location of the 15 mmf orifice results in two peaks of RFQ transmission rate against SOL currents.
	Slides TUPO079 [0.968 MB]
	Poster TUPO079 [1.699 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO079
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO083	Beam Dynamics for the FAIR p-Linac Ladder RFQ	rfq, emittance, simulation, ion-source	522
	M. Syha, U. Ratzinger, M. Schuett IAP, Frankfurt am Main, Germany
	After the successful measurements with a 0.8 m prototype a 3.3 m Ladder-RFQ is under construction at IAP, Goethe University Frankfurt. It is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the p-Linac at FAIR. Along the acceleration section modulation parameter, aperture and synchronous phase all course (quasi-)linear, which differentiates this design approach from other designs developed at IAP. The ratio of transversal vane curvature radius to mid-cell radial aperture as well as the vane radius itself are constant, which favors a flat voltage distribution along the RFQ. This was verified by implantation of the modulated vane geometry into MWS-CST RF field simulations. The development of adequate beam dynamics was done in close collaboration with the IAP resonator design team. The Los Alamos RFQGen-code was used for the RFQ design and the beam dynamics simulations.
	Poster TUPO083 [0.932 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO083
About •	paper received ※ 12 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019
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TUPO084	Beam Dynamics Simulations for the New Superconducting CW Heavy Ion LINAC at GSI	cavity, heavy-ion, cryomodule, experiment	525
	M. Schwarz, M. Basten, M. Busch, H. Podlech IAP, Frankfurt am Main, Germany K. Aulenbacher IKP, Mainz, Germany K. Aulenbacher, W.A. Barth, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu HIM, Mainz, Germany W.A. Barth, M. Heilmann, A. Rubin, A. Schnase, S. Yaramyshev GSI, Darmstadt, Germany
	Funding: Work supported by BMBF contr. No. 05P15RFRBA, EU Framework Programme H2020 662186 (MYRTE) and HIC for FAIR For future experiments with heavy ions near the coulomb barrier within the super-heavy element (SHE) research project a multi-stage R&D program of GSI/HIM and IAP is currently in progress. It aims for developing a supercon-ducting (sc) continuous wave (CW) LINAC with multiple CH cavities as key components downstream the High Charge State Injector (HLI) at GSI. The LINAC design is challenging due to the requirement of intense beams in CW mode up to a mass-to-charge ratio of 6, while covering a broad output energy range from 3.5 to 7.3 MeV/u with unchanged minimum energy spread. Testing of the first CH-cavity in 2016 demonstrated a promising maximum accelerating gradient of E_a = 9.6 MV/m; the worldwide first beam test with this sc multi-gap CH-cavity in 2017 was a milestone in the R&D work of GSI/HIM and IAP. In the light of experience gained in this research so far, the beam dynamics layout for the entire LINAC has recently been updated and optimized.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO084
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO085	Modelling of Beam Parameters of RF Linac for GBS-ELI-NP	simulation, quadrupole, gun, emittance	528
	P.S. Tracz IFIN-HH, Bucharest - Magurele, Romania
	The Gamma Beam System at the ELI-NP (Extreme Light Infrastructure - Nuclear Physics) currently being constructed in Magurele/Bucharest, Romania will be a high-brilliance advanced source of gamma rays based on laser Compton back-scattering. For a successful operation of the GBS a high brightness low emittance electron beam is of crucial importance. The warm RF linac is designed in two stages - one with the beam up to 300 MeV, and another one about 720 MeV. The S-band photo-injector is combined with a C-band linac. The beam is transported by transfer lines to the interaction points. In this paper we report the results of computer simulations of the electron beam transport in the low energy linac and transfer line up to the low energy interaction point (IP1). The simulation model makes it possible to predict the beam parameters to be recuperated in case of failure of any magnetic or accelerating elements as well as it enables to determine the optimal parameters of replaced components. It will be used for the development of the Gamma Beam System in the future.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO085
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO088	Measurement of Diagnostics Response by RF Parameters for Hard X-ray Line in PAL-XFEL*	FEL, diagnostics, gun, timing	531
	H. Yang PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: *This work is supported by MSIP, Korea. PAL-XFEL is a hard x-ray (HX) and soft x-ray (SX) FEL machine to generate 2.5 - 15 keV FEL in the HX line and 0.28 - 1.2 keV FEL in the SX line. The HX line consists of an e-gun, a laser heater, S-band accelerators, an X-band linearizer, three bunch compressors (BC), and a dog-leg line. PAL-XFEL maintains the stable operation and FEL delivery with more than 98% availability due to machine stabilities including RF modules. In order to investigate the stable operation, we measure the diagnostics response for bunch charge monitors, energy beam position monitors, bunch length monitors, and a FEL intensity with a photon beam position monitor by RF parameters - RF amplitude and phase for an e-gun, accelerators, and a linearizer. In this paper, we present mainly corresponding RF parameters for e-beam and FEL jitters by this measurement and matrix analysis.
	Poster TUPO088 [0.281 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO088
About •	paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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TUPO091	Beam Break Up Instability Analysis for Cavities, Linacs and Energy Recovery Linacs	dipole, cavity, polarization, focusing	537
	V. Volkov, V.M. Petrov BINP SB RAS, Novosibirsk, Russia
	This analyze argue that BBU instability both in separate cavities and in Linacs or ERLs is going due to the consequence of fundamental property of dipole modes. ’Head-tail’ bunch instability has also the same nature. New BBU instability testing methods are described and analytically proved in the article.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO091
About •	paper received ※ 14 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO095	Beam Loading with the First Rebuncher of Spiral2, First Measurements	cavity, simulation, controls, experiment	546
	M. Lechartier, R. Ferdinand, J.F. Leyge GANIL, Caen, France
	In the SPI2 project the middle energy line (LME) is equiped with a radio frequency qupole and three Rebunchers. The subject of this article is to measure and characterise the effect of the beam loading on the first Rebuncher cavity.
	Poster TUPO095 [1.146 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO095
About •	paper received ※ 20 September 2018 paper accepted ※ 15 January 2019 issue date ※ 18 January 2019
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TUPO101	Design of Practical HSC Type Injector for Cancer Therapy	rfq, DTL, cavity, injection	557
	C.C. Xing, T. He, C.X. Li, J. Li, L. Lu, L. Yang IMP/CAS, Lanzhou, People’s Republic of China
	The Hybrid single cavity(HSC), which is designed for 20 mA beam acceleration, is a new HSC Type Injector for Cancer Therapy. Its designed particle, resonant frequency, injection and final energies are designed from beam-optics considerations of the entire system to be C⁶⁺, 100MHz, 20keV/u and 0.6MeV/u. In order to achieve these requirements, keeping the Maximum surface electric field to less than 1.9-times the Kilpatrick limit, the RFQ becomes about 1.2 m long and the DTL is about 2.5 m long. The total efficiency of transmission is more than 80%.
	Poster TUPO101 [0.345 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO101
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO112	Calculation of Electron Beam Dynamics in Four Accelerating Stations for JINR Linear Electron Accelerator LINAC-200	electron, solenoid, detector, acceleration	566
	A. Sledneva, V. Aleksandrov, V.V. Kobets JINR, Dubna, Moscow Region, Russia
	In the Joint Institute for Nuclear Research a Test Stand with an electron beam generated by the linear accelerator LINAC-200 with the energy up to 200 MeV is being constructed to investigate properties of accelerating and semiconducting structures for advanced detectors, a radiation resistance of detectors based on gallium arsenide semiconductor, to study a free electron laser and to do other applied for work. The technical characteristics of the LINAC-200 accelerator make it possible to create an advanced system of test beams for scientific and methodological studies of detectors on its basis. Four accelerating stations with maximum beam energy up to 200 MeV are put into operation. The work is being carried out for experiments with electron test beams with energy up to 800 MeV. This work presents the calculation results of the magnetic field of the focusing solenoidal system and electron beam dynamics in accelerating stations. In addition, the results on the formation of the electron beam with optimal parameters to be captured in further accelerating sections.
	Poster TUPO112 [1.176 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO112
About •	paper received ※ 12 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019
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TUPO113	Beam Dynamics Studies Through Dielectric THz Accelerating Structures	GUI, simulation, vacuum, accelerating-gradient	569
	R. Apsimon, G. Burt, A.L. Healy, S.P. Jamison Cockcroft Institute, Lancaster University, Lancaster, United Kingdom R.B. Appleby, E.J.H. Smith UMAN, Manchester, United Kingdom A. Latina CERN, Geneva, Switzerland
	As conventional RF accelerating schemes approach the physical limit of accelerating gradient, the accelerator community is increasingly looking at novel accelerating techniques to overcome these limitations. Moving from the RF to the THz frequency range, higher acceleration gradients of high energy beams can be achieved in compact structures. Beam dynamics studies are crucial as part of the design of novel accelerating structures to maximise the output beam current as well as the accelerating gradient. In this paper we present beam dynamics simulations through dielectric lined waveguide structures using novel techniques to simulate broadband signals for particle tracking studies in RF-Track. The beam parameters through the structure are optimised and we study the dynamics of general broadband accelerating structures.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO113
About •	paper received ※ 13 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO114	Beam Dynamics Studies for the CSNS DTL Due to a Quadrupole Fault	lattice, DTL, MMI, quadrupole	573
	J. Peng, M.T. Li, Y.D. Liu, X.H. Lu, X.B. Luo CSNS, Guangdong Province, People’s Republic of China Y.W. An, S. Fu, L. Huang, M.Y. Huang, Y. Li, Z.P. Li, S. Wang, S.Y. Xu, Y. Yuan IHEP, Beijing, People’s Republic of China
	The China Spallation Neutron Source(CSNS) accelera-tor systems is designed to deliver a 1.6GeV, 100kW pro-ton beam to a solid metal target for neutron scattering research. It consists of a 50keV H⁻ Ion Source, a 3MeV Radio Frequency Quadrupole (RFQ), an 80MeV Drift Tube Linac (DTL), and a 1.6GeV Rapid-cycling Synchro-tron (RCS). The DTL consists of four tanks. In 2017, three of four tanks have been commissioned successfully, and beam has been accelerated to 61MeV with nearly 100% transmission. However, in July 2017, one quadrupole contained in the drift tube was found fault, the beam transmission decreased to 80%. A new lattice has been designed and the 100% transmission has recovered. In January 2018, the last tank of the DTL has been commissioned and accelerated the H⁻ beam to the design energy of 80MeV for the first time. The commissioning progress and the measurement results before and after lattice adjustment will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO114
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO115	Beam Parameters Measurement and Correction in CSNS Linac	emittance, MMI, DTL, injection	576
	Z.P. Li, Y. Li IHEP, Beijing, People’s Republic of China J. Peng CSNS, Guangdong Province, People’s Republic of China
	All the beam parameters of China Spallation Neutron Source (CSNS) linac had achieved the acceptance goals in January 2018 after a 2-year commissioning. Parameters of the H⁻ beam were carefully studied and corrected. Beam energy was measured and the energy dispersion are reduced. Transverse emittance are obtained by different tools and methods. Linear optics measurements and corrections were carried out under varied beam energies and peak intensities.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO115
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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Paper

Title

Other Keywords

Page

MO1A01

CSNS Front End and Linac Commissioning

MMI, DTL, rfq, cavity

1

S. Fu, H.C. Liu, H.F. Ouyang, S. Wang
IHEP, Beijing, People’s Republic of China
J. Li, J. Peng
CSNS, Guangdong Province, People’s Republic of China

The China Spallation Neutron Source(CSNS) accelera-tor systems is designed to deliver a 1.6GeV, 100kW proton beam to a solid metal target for neutron scattering research. The accelerator consists of a front end, an 80MeV DTL linac, and a 1.6GeV Rapid Cycling Syn-chrotron (RCS). In August 2017 the first 1.6GeV proton beam hit on the tungsten target and production neutrons were monitored. This paper will report the major steps and results of the machine commissioning and beam commissioning of the CSNS front end and linac. In the first section, a brief introduction of the CSNS accelerator design and present status will be presented. Then, we will share our commissioning experience in the front end and the DTL linac in the following sections.

Slides MO1A01 [9.123 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1A01

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paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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MO1A02

An Overview of Recent Developments in SRF Technology

cavity, SRF, niobium, cryomodule

6

R.E. Laxdal
TRIUMF, Vancouver, Canada

Superconducting Radio-Frequency (SRF) is now the technology of choice for both large and small linac projects. Several challenging projects are in progress or planned that are pushing SRF technology and/or are enabled by SRF technology. This paper gives an overview of the present status of the field.

Slides MO1A02 [4.202 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1A02

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paper received ※ 16 September 2018 paper accepted ※ 31 October 2018 issue date ※ 18 January 2019

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MO2A03

Technology Developments for ELI-NP Gamma Beam System

laser, gun, electron, LLRF

13

L. Piersanti, D. Alesini, A. Battisti, M. Bellaveglia, S. Bini, F. Cardelli, R.D. Di Raddo, A. Falone, A. Gallo, V.L. Lollo, L. Pellegrino, S. Pioli, S. Tomassini, A. Variola
INFN/LNF, Frascati (Roma), Italy
N. Beaugerard
SEIV, Mérignac, France
K. Cassou, D. Douillet, K. Dupraz, T. Le Barillec, A. Martens, C.F. Ndiaye, Y. Peinaud, Z.F. Zomer
LAL, Orsay, France
L. Ficcadenti, A. Mostacci, L. Palumbo, V. Pettinacci
INFN-Roma, Roma, Italy
M. Migliorati
INFN-Roma1, Rome, Italy
D.T. Palmer, L. Serafini
Istituto Nazionale di Fisica Nucleare, Milano, Italy
H. Rocipon
ALSYOM, Argebteuil, France

ELI-NP gamma beam system (GBS) is a linac based gamma-source in construction in Magurele (RO) by the European consortium EuroGammaS led by INFN. Photons with tunable energy, from 0.2 to 19.5 MeV, and with intensity and brilliance beyond the state of the art, will be produced by Compton back-scattering between a high quality electron beam (up to 740 MeV) and an intense laser pulse at 100 Hz repetition rate. Production of very intense photon flux with narrow bandwidth requires multi-bunch operation and laser recirculation at the interaction point. In this paper, the main technological developments carried out by the EuroGammaS consortium for the generation of the ELI-NP gamma beam will be described with a special emphasis on the electron linac technology, such as: RF-gun and C-band accelerating structures design fabrication and tests; low level RF (LLRF) and synchronization systems specifications and development. Finally, the laser recirculation apparatus design is briefly described and first results reported.

Slides MO2A03 [9.121 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO2A03

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MO1P01

Status of the SNS Proton Power Upgrade Project

target, cryomodule, injection, operation

24

J. Galambos, M.S. Champion, M.P. Howell, S.-H. Kim, J. Moss, M.A. Plum, B.W. Riemer, K.S. White
ORNL, Oak Ridge, Tennessee, USA
M. S. Connell, R. W. Steffey
ORNL RAD, Oak Ridge, Tennessee, USA

SNS plans to double the power capability of the SNS proton beam by increasing the beam energy and the beam current. Accelerator scope includes additional superconducting RF cryo-modules and supporting RF systems, and upgrades to existing RF systems. Also the accumulator storage ring and the neutron source target will be upgraded to accommodate the additional power. The technical approach, project status and plans will be discussed.

Slides MO1P01 [6.457 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1P01

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paper received ※ 10 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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MO1P02

Approaches to High Power Operation of J-PARC Accelerator

operation, rfq, ion-source, cavity

29

H. Oguri
JAEA/J-PARC, Tokai-mura, Japan

Japan Proton Accelerator Research Complex (J-PARC) accelerators have been having over 10 years of operation experience. In 2006, the J-PARC linac started beam operation with an energy of 181 MeV. To realize the nominal performance of 1 MW at 3 GeV Rapid Cycling Synchrotron (RCS) and 0.75 MW at a 30 GeV Main Ring synchrotron (MR), the linac energy was upgrade to 400 MeV by adding an annular-ring coupled structure linac, and the beam current was also upgraded from 30 to 50 mA by replacing a new ion source and an RFQ. After the upgrade, the RCS demonstrated 1MW equivalent beam operation and currently operates 400 kW for the Material and Life Science Facility. The MR beam power is increasing and becomes about 480 kW beam to the Neutrino Facility and about 50 kW at the Hadron Experimental Facility. Further upgrade plan of 1.5 MW beam power from the RCS is now in consideration. To achieve the plan, it is necessary to increase by about 20 % both beam current and pulse length at the linac. The detail process in the past upgrade and the possibility for further upgrade at the linac will be presented in this talk.

Slides MO1P02 [5.595 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1P02

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paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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MO1P03

Status of the ESS Linac

cavity, ion-source, controls, target

35

A. Sunesson, P. Arnold, S.L. Birch, R. Garoby, M. Jensen, M. Lindroos, C.A. Martins, A. Nordt, T.J. Shea, J.G. Weisend
ESS, Lund, Sweden

The European Spallation Source under construction in Lund (Sweden) uses a 2 GeV-5MW pulsed superconducting linac as proton driver. Normal conducting accelerating structures are used up to 92 MeV and superconducting structures up to 2 GeV. Most linac components are designed and procured as in-kind contributions by institutes/laboratories in the European partner countries. Installation of the Ion source delivered by INFN-Catania started end 2017. Installation of more components and infrastructure progresses at a high pace. Commissioning of the normal conducting linac section will take place in parallel with installation of the superconducting section. Beam commissioning of the superconducting section will be done starting in 2021, interlaced with the installation of additional high beta cryomodules. Beam will be sent to the target in 2022, initially at an energy of 1.3 GeV. Start of the User Programme is scheduled in 2023, when some neutron instruments will be ready and end of construction is in 2025, with the full set of instruments operational. This paper reports the status of linac components construction, the progress with installation on site, and the overall project schedule.

Slides MO1P03 [14.161 MB]

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MOPO009

ELI-NP Gamma Beam System - Current Project Status

laser, gun, electron, experiment

59

P.S. Tracz
IFIN-HH, Bucharest - Magurele, Romania

The Gamma Beam System at the ELI-NP under construction in Magurele/Bucharest Romania, aims at producing high brilliance gamma-rays based on the laser Compton back-scattering, up to 3.5 and 19.5 MeV out of two interaction chambers. The design of warm RF electron linac is optimized to meet the unique source specification i.e. high brilliance, small relative bandwidth, tunable energy, and high spectral density. Together with technological development in field of high energy/high quality lasers it will open new opportunities for nuclear physics research in fields like nuclear photonics, nuclear astrophysics, photo-fission, and production of exotic nuclei, applications in industry, medicine, and space science. S-band laser driven RF photo-gun and two accelerating structures constitute the injector. The beam is then accelerated by C-band linac up to 350MeV (low energy linac), and up to 720MeV (high energy linac). The GBS was designed and is being constructed by the EuroGammaS - a consortium of European academic and research institutions and industrial partners. This paper gives an overview of the facility, describes the main linac systems and summarizes the project status.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO009

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MOPO018

Development of an Improved Capture Section for the S-DALINAC Injector*

cavity, electron, simulation, gun

68

S. Weih, M. Arnold, J. Enders, N. Pietralla
TU Darmstadt, Darmstadt, Germany
D.B. Bazyl, H. De Gersem, W.F.O. Müller
TEMF, TU Darmstadt, Darmstadt, Germany

For the injector of the superconducting Darmstadt electron linear accelerator S-DALINAC, the design of a new capture cavity was recently completed. This beta-reduced structure will optimize the capture of low-energy electron bunches from the gun section and therefore improve the longitudinal beam quality of the injector beam, as simulations have shown. The existing cryomodule of the injector has to be modified for the installation of the new cavity. These modifications include adaptions of the tuner frame as well as modifications of other surrounding parts. To improve the diagnostics in the low-energy section, an energy-spread measurement setup is currently also under development. In this contribution the cryomodule modifications as well as simulation results for the longitudinal beam dynamics are presented.
*Work supported by DFG through GRK 2128 "AccelencE"

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO018

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MOPO024

Development of High Power Coherent Terahertz Wave Sources at Lebra 125 MeV Linac in Nihon University

FEL, electron, radiation, undulator

78

T. Sakai, K. Hayakawa, Y. Hayakawa, K. Nogami, Y. Sumitomo, Y. Takahashi, T. Tanaka
LEBRA, Funabashi, Japan
H. Ogawa, N. Sei
AIST, Tsukuba, Ibaraki, Japan

Funding: This work was supported by JSPS KAKENHI Grant Number JP16K17539 and JP16H03912.
Research and Development of a high performance electron linac for the generation of FEL, Parametric X-ray Radiation (PXR) and THz waves has been continued at the Laboratory for Electron Beam Research and Application (LEBRA) of Nihon University as a joint research with KEK and National Institute of Advanced Industrial Science and Technology. The transport systems of the THz wave were installed in the vacuum chamber on the downstream side of the bending magnet of the PXR and FEL beam-line. The CER and the CSR are generated by the bending magnet each of the beam line. In addition, the CTR using thin metal foil is also generated. The average power of the CTR wave was measured approximately 1 mJ/macro-pulse (pulse width 4.5 µs) near the CTR wave beam source point in the frequency range of 0.1 - 2.5 THz. In addition, the energy of the CER as high as 0.2 mJ/macro-pulse were achieved with the experimental room. Furthermore, CER of the generated the FEL beam line can also be guided from the bending magnet on the downstream side of the undulator without disturbing the FEL oscillations. THz transport beam-lines and the characteristics of the THz waves are discussed in this report.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO024

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MOPO035

Status of CLARA Front End Commissioning

laser, GUI, cathode, MMI

98

D. Angal-Kalinin, A.D. Brynes, S.R. Buckley, P.A. Corlett, L.S. Cowie, K.D. Dumbell, D.J. Dunning, P.C. Hornickel, F. Jackson, J.K. Jones, J.W. McKenzie, B.L. Militsyn, A.J. Moss, T.C.Q. Noakes, M.D. Roper, D.J. Scott, B.J.A. Shepherd, E.W. Snedden, N. Thompson, C. Tollervey, D.A. Walsh, T.M. Weston, A.E. Wheelhouse
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
R.J. Cash, R.F. Clarke, G. Cox, C. Hodgkinson, R.J. Smith, J.T.G. Wilson
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
K.D. Dumbell, B.J.A. Shepherd
Cockcroft Institute, Warrington, Cheshire, United Kingdom

CLARA (Compact Linear Accelerator for Research and Applications) is a Free Electron Laser (FEL) test facility under development at Daresbury Laboratory. The principal aim of CLARA is to test advanced FEL schemes which can later be implemented on existing and future short wavelength FELs. We report on the commissioning of the CLARA front end, consisting of a photoinjector and the first linac section, and merger into the existing VELA (Versatile Electron Linear Accelerator) beamline.

Slides MOPO035 [1.870 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO035

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MOPO042

Evolutionary Many-objective Optimization Algorithm for Large-bandwidth Free-Electron-Laser Generation

electron, FEL, free-electron-laser, laser

121

J.W. Yan, H.X. Deng
SINAP, Shanghai, People’s Republic of China

Funding: National Natural Science Foundation of China , the National Key Research and Development Program of China, the Young Elite Scientist Sponsorship Program by CAST and Ten Thousand Talent Program.
X-ray free-electron lasers (XFELs) are leading-edge instruments in a wide range of research fields. Besides pursuing narrow bandwidth FEL pulses, the large-bandwidth XFEL pulses are very useful in various spectroscopy experiments, multi-wavelength anomalous diffraction, and X-ray crystallography. Overcompression operation scheme can be utilized to generate electron beams with large energy chirp which is benefit for bandwidth broadening. Recently, an evolutionary many-objective (having four or more objectives) algorithm, NSGA-III, was used to optimize the electron beam parameters in the overcompression including energy chirp, energy spread, current profile, peak current, and projected emittance. In this paper, combining with the Xie’s semianalytical estimate formula, the NSGA-III is utilized to find an optimal working point of linac by optimizing the XFEL pulse properties directly. Start-to-end numerical simulations based on the Shanghai soft X-ray Free-Electron Laser user facility parameters demonstrate that a full bandwidth of 4.75% can be generated.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO042

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MOPO058

Industrial Electron Linear Accelerator R&D in CIAE

electron, gun, radiation, controls

124

J.H. Yang, Y. Yang, G. Yu, Z.Q. Zeng
CIAE, Beijing, People’s Republic of China
Z.B. Zhu
China Institute of Atomic Energy, Beijing, People’s Republic of China

Electron linear accelerator(E-LINAC)is a vital accelerator type for accelerator applications, which widely applied in industry, agriculture and medical industry. The paper introduces R&D of industrial E-LINAC in China Institute of Atomic Energy (CIAE) , including electron gun, modulator, accelerating tube, assembling and testing. Based on these R&D results, the GT series for non-destructive testing(NDT) and FZ series for irradiation processing are developed successfully. At present these E-LINACs play important roles in pressure vessel inspection, food preservation, sterilization and material modification, promoting the E-LINACs application as well as economic development in China.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO058

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paper received ※ 11 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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MOPO063

Development of Side-coupled X-band Medical Linear Accelerator for Radiotherapy

cavity, electron, gun, target

139

Y.S. Lee, Y.W. Choi, G.J. Kim, I.S. Kim, J.I. Kim, S. Kim, J.H. Lee
KERI, Changwon, Republic of Korea
J.H. Hwang, Y.N. Kang, A.R. Kim, J.N. Kim, T.G. Oh, Y.A. Oh, Y. J. Seol, J.S. Shin
The Catholic University of Korea, Seoul, Republic of Korea

Recently, LINAC-based radiotherapy equipment are being developed by combining with imaging devices such as CT or MRI, so that it is possible to precisely focus high dose radiation on tumor tissues while minimizing the normal tissue damage. In order to place the diagnostic and treatment devices simultaneously in a confined space, constraints related to interference and volume between the subsystems must be considered. To meet these requirements, the size and weight of the LINAC system need to be reduced, which can be achieved by applying X-band technology. For the purpose of use in IMRT based on image guided radiotherapy, we developed a 9.3 GHz X-band medical LINAC using side-coupled structure. The LINAC is designed to have the accelerating field strength of 16.8 MV/m, and the beam current transmission efficiency of 26 % at the end of accelerating cell when the supplied RF power is at 1.7 MW. Therefore, it can accelerate the electron beam up to 6.2 MeV with having about 90 mA beam current. We plan to carry out the performance test using beam diagnostics system and X-ray measurement system, and the details of design and experimental results of LINAC will be described in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO063

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paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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MOPO064

O-Arm Mounted X-Band Linear Accelerator System for Radiotherapy

GUI, radiation, DSL, operation

142

S. Kim, Y.W. Choi, G.J. Kim, I.S. Kim, J.I. Kim, J.H. Lee, Y.S. Lee
KERI, Changwon, Republic of Korea
J.H. Hwang, Y.N. Kang, A.R. Kim, J.N. Kim, T.G. Oh, Y.A. Oh, Y. J. Seol, J.S. Shin
The Catholic University of Korea, Seoul, Republic of Korea

Current advances in radiotherapy are based on the precise imaging techniques, and there is a pressing need for the development of techniques that are capable of visualizing cancer tissues in real time in conjunction with radiotherapy. Indeed, the image-guided radiotherapy systems in which conventional diagnostic tools such as CT and MRI are combined with the linear accelerator (LINAC)-based radiotherapy have been extensively studied. In this work, we mounted 9.3GHz X-band LINAC designed by KERI on the 360 degree-rotatable O-arm system, which allows efficient integration of a diagnostic tool with a radiotherapy equipment. After mounting, the X-ray profile and percentage depth dose were measured by following the quality assurance using the AAPM TG-51,142 protocol. The beam profile symmetry was estimated to be 10².4% with ±3% tolerance. The X-ray dose was also measured by rotating the O-arm to confirm the stability of the mounted X-band LINAC. As a result, the standard deviation of the X-ray dose was shown to be 0.016 while rotating. Therefore, we demonstrate the feasibility of our O-arm X-band LINAC system for use in highly effective radiotherapy with simultaneous CT image guidance.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO064

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO069

Nuclear and Mechanical Basic Design of Target for Mo-99 Production Using High Power Electron Linac

target, photon, electron, neutron

148

A. Taghibi Khotbeh-Sara, F. Rahmani
KNTU, Tehran, Iran
F. Ghasemi
NSTRI, Tehran, Iran
H. Khalafi
AEOI, Tehran, Iran
M. Mohseni Kejani
Shahid Beheshti University, Tehran, Iran

Today providing enough supplies of 99mTc / 99Mo as a high usage radioisotope in diagnostic nuclear medicine for the world demand is a big challenge. One of the proofed ways to access reliable source of this radioisotopes is production using e-LINAC [1]. In this investigation it was tried to find the simple and the optimized design of 99Mo production target based on photoneutron reaction using e-LINAC. Based on the Monte-Carlo calculation for radiation transport and finite element thermal analysis, 9 thin plates of enriched 100Mo was suggested. Equal distance between plates was considered for cooling to prevent target melting. The main target includes only 100Mo in one-stage approach method to increase production rate in compare with two-stage approach [2]. Applying 2.5 m/s for inlet velocity of cooling water provides suitable cooling process with maximum temperature of target about 900 ˚C.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO069

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO070

Construction of the Side-coupled Standing-wave e-Linac

cavity, simulation, coupling, electron

151

S. Zarei
Nuclear Science and Technology Research, InstituteRadiation Application School, Tehran, Iran
F. Abbasi
Shahid Beheshti University, Tehran, Iran
M. Bahrami, M. Lamehi
IPM, Tehran, Iran
F. Ghasemi
NSTRI, Tehran, Iran

Due to Iran’s growing need for accelerators in various applications, NSTRI electron linear accelerator project has been defined for medical and inspection applications. This accelerator is a 6 MeV side-coupled standing-wave that operate is π /2 mode in the frequency of 2998.5 MHz. In this paper the construction and measurement results of the tube of this accelerator are presented. The prototype tube was constructed from aluminum and was clamped with bolts. By using a network analyzer, electric and magnetic probes and a side-coupled cavity tuning method and a bead-pull measurement technique, RF measurements were carried out. The resonant frequency and quality factor have been achieved 2998.5 MHz and 7940 respectively .
low-energy accelerator, construction of linac, standing-wave linac

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO070

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paper received ※ 12 September 2018 paper accepted ※ 09 November 2018 issue date ※ 18 January 2019

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MOPO077

Design of the High Gradient Negative Harmonic Structure for Compact Ion Therapy Linac

proton, coupling, operation, simulation

160

S.V. Kutsaev, R.B. Agustsson, A.Yu. Smirnov, A. Verma
RadiaBeam, Santa Monica, California, USA
A. Barcikowski, R.L. Fischer, B. Mustapha
ANL, Argonne, Illinois, USA

Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under SBIR grant DE-SC0015717 and Accelerator Stewardship Grant, Proposal No. 0000219678
A novel concept for an Advanced Compact Carbon Ion Linac (ACCIL) that will deliver up to 1 pnA of carbon ions with variable energy from 45 MeV/u to 450 MeV/u in a 45 m footprint, has been developed by Argonne National Laboratory (ANL) in collaboration with RadiaBeam. The ACCIL will have a 35 MV/m real-estate accelerating gradients that became possible to achieve with the development of novel S-band high-gradient structures, capable of providing 50 MV/m accelerating gradients for particles with β>0.3. In particular, a β=0.3 structure based on the novel approach of operation at the first negative spatial harmonic with the increased distance between the accelerating gaps will be presented. This is the first attempt to reach such high gradients at such small velocities. RadiaBeam and ANL have demonstrated the feasibility of building this structure for accelerating carbon ions by means of advanced computer simulations and are currently working towards the fabrication of this structure for high power tests.

Slides MOPO077 [1.863 MB]

Poster MOPO077 [0.923 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO077

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO079

Cavity Design of a 7 MeV 325 MHz Proton APF IH-DTL for a Compact Injector

cavity, DTL, proton, focusing

163

X. Li
University of Chinese Academy of Sciences, Beijing, People’s Republic of China
X. Li, Y.H. Pu, X.C. Xie, M.H. Zhao
SINAP, Shanghai, People’s Republic of China
F. Yang
Shanghai APACTRON Particle Equipment Company Limited, Shanghai, People’s Republic of China

Funding: National Key Research and Development Program of China (grant number 2016YFC0105408)
An Interdigit H-mode Drift-Tube-Linac (IH-DTL) with Alternating-Phase-Focusing (APF) method working at 325MHz was designed. With the RF field established properly in the cavity, protons can be accelerated from 3MeV to 7MeV successfully. In this paper, the process of designing such an APF IH-DTL cavity is going to be presented. Also, the characteristics of the cavity and pa-rameters studying of RF are going to be demonstrated.

Poster MOPO079 [0.433 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO079

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paper received ※ 02 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO080

The Manufacturing of the CSNS DTL Tank

cavity, DTL, vacuum, factory

167

X.L. Wu, T. Luo
CSNS, Guangdong Province, People’s Republic of China
L. Dong, K.Y. Gong, H.C. Liu, H. Song
IHEP, Beijing, People’s Republic of China
S.M. Liu
DNSC, Dongguan, People’s Republic of China

The DTL tank is a crucial component of the China Spallation Neutron Source (CSNS) linear accelerator (LINAC), which mainly use the technology of oxygen-free copper (OFC) electroplating on the inner surface of the 20# carbon steel tube. It is the first time to perform OFC electroplating with high electrical conductivity in the high intensity beam accelerator in China. In the process of cavity manufacturing, problems such as machining deformation, plating surface nodule and plating peeling are encountered. In this project, based on pre-research and information from literature, the formula of acid solution was improved to construct a stable pickling process protocol. The manufacturing process of DTL tank and the measurement details are introduced in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO080

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paper received ※ 10 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO084

The Simulation and Manufacture of the Room Temperature CH-DTL

cavity, impedance, DTL, rfq

177

J.H. Li, G. Han
China Institute of Atomic Energy, Beijing, People’s Republic of China
C.G. Li
CIAE, Beijing, People’s Republic of China
Z. Li
SCU, Chengdu, People’s Republic of China

The room temperature Cross-bar H Type Drift Tube Linac (CH-DTL) is one of the candidate acceleration structures working in CW mode. In order to optimize the parameters, the 3 dimensional electromagnetic field of the CH-DTL cavity is simulated. The method of parameter sweeping with constraint variable is better than the method of parameter sweeping with only one variable during the optimization. In order to simplify the manufacture, the drift tube surface can be designed as spherical shape. The CH-DTL cavity has been manufactured and tested.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO084

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paper received ※ 31 August 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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MOPO085

Prototype of an Inter-digital H-mode Drift-tube Linac for Muon Linac

cavity, focusing, DTL, experiment

180

Y. Nakazawa, H. Iinuma
Ibaraki University, Ibaraki, Japan
K. Hasegawa, Y. Kondo, T. Morishita
JAEA/J-PARC, Tokai-mura, Japan
N. Hayashizaki
RLNR, Tokyo, Japan
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan
Y. Iwata
NIRS, Chiba-shi, Japan
N. Kawamura, T. Mibe, M. Otani, T. Yamazaki, M. Yoshida
KEK, Ibaraki, Japan
R. Kitamura, H.Y. Yasuda
University of Tokyo, Tokyo, Japan
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
Y. Sue
Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan

An inter-digital H-mode (IH) drift-tube linac (DTL) is developed for a low velocity part in a muon linac at the J-PARC E34 experiment. It will accelerate muons from v/c = 0.08 to 0.28 at an operational frequency of 324 MHz. In order to achieve higher acceleration efficiency and make cost lower, an alternative phase focusing (APF) scheme is adopted. A prototype with 6 cells of 0.45 m length was manufactured. The prototype accelerates muons from v/c = 0.08 to 0.15 stage. We conducted frequency measurement and bead-pull measurement as a low-power measurement, in order to evaluate the prototype product. In this paper, the results of the low-power measurement for prototype cavity will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO085

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paper received ※ 10 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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MOPO087

Cold Test of Hybrid RFQ Prototype

rfq, quadrupole, simulation, cavity

184

P.Y. Yu, Y. He, C.X. Li, F.F. Wang, Z.J. Wang, B. Zhang
IMP/CAS, Lanzhou, People’s Republic of China

Hybrid RFQ is proposed as a potential good choice at the low-energy range of linear accelerator, which is combined by four-vane RFQ structure and CH-DTL structure. It has higher energy gain rate compared to conventional RFQ, and it is more compact than traditional DTL. In order to research on process exploration and RF parameters of this structure, an aluminium prototype is developed. The cold test of Hybrid RFQ prototype is completed. This paper will present the results and analysis of the test.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO087

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paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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MOPO088

Study on a 325 MHz HOM Drift Tube Linac

DTL, HOM, cavity, impedance

187

L. Lu, T. He, W. Ma, C.C. Xing, L. Yang
IMP/CAS, Lanzhou, People’s Republic of China

Normally, drift tube linacs (DTL) are used following RFQ linacs for beam acceleration in middle and high beam energy region. but acceleration efficiency of DTLs is decreasing with beam energy increasing. Using resonated higher order mode (HOM) of cavity, DTL can get higher effective shunt impedance. we proposed a 325MHz DTL with TE115 mode. In this paper, the dynamics calculation and electromagnetic design of the HOM-DTL will be reported.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO088

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paper received ※ 13 September 2018 paper accepted ※ 17 October 2018 issue date ※ 18 January 2019

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MOPO089

Design Details of the European Spallation Source Drift Tube LINAC

DTL, interface, vacuum, GUI

190

P. Mereu, M. Mezzano, C. Mingioni, M. Nenni
INFN-Torino, Torino, Italy
G. Cibinetto
INFN-Ferrara, Ferrara, Italy
F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy

The Drift Tube Linac (DTL) of the European Spallation Source (ESS) is designed to operate at 352.2MHz with a duty cycle of 4% (3 ms pulse length, 14 Hz repetition period) and will accelerate a proton beam of 62.5mA pulse peak current from 3.62 to 90 MeV. This paper gives a detailed overview of the ESS-DTL current mechanical design, and the related driving criteria. It presents also an outlook of the main aspects of the assembly and installation, with related equipments, toolings and procedures.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO089

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO093

A Study of a Cooling Configuration for an OFHC Copper Rebuncher

cavity, simulation, pick-up, vacuum

200

O. Mazor, M. Bukai, D. Nusbaum, J. Rodnizki
Soreq NRC, Yavne, Israel
E. Dyunin
Ariel University, Ariel, Israel
G. Ziskind
Ben-Gurion University in the Negev, Beer Sheva, Israel

Funding: Pazy Fund (Israel Atomic Energy commission) https://pazy.org.il
A four gap OFHC copper rebuncher is developed at SNRC as a research study and a risk reduction for the MEBT of SARAF Phase II proton/ deuteron linac. The rebuncher is designed to bunch a 5 mA CW beam at 176 MHz. The required cavity voltage according to beam dynamics evaluation is 150 kV with a beam aperture diameter of 40 mm at a beam energy of 1.3 MeV/u with a Q value of 8000. Considering utilizing this cavity for enhancing the beam energy, the cooling configuration is explored for a cavity voltage of 300 kV, consuming 20 kW dissipated power, at a peak electric field of 16 MV/m, equivalent to the Kilpatrick limit. The electro magnetic study conducted with the CST RF simulation package was reproduced at ANSYS HFSS. The simulated dissipated power along the rebuncher for 20 kW forward power injected through the coupler port with the HFSS driven model were assigned to the ANSYS Fluent model to explore the resulted temperature map. Several evolved cooling configurations were studied, including cooling of the drift tubes. In this configuration the temperature rise along the cavity is in the range of 30 K. A detailed design of the four gap rebuncher is following this study.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO093

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paper received ※ 03 September 2018 paper accepted ※ 22 September 2018 issue date ※ 18 January 2019

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MOPO100

Doubly Stripped Proton Causing Vacuum Leak at Brookhaven 200 MeV H⁻ linac Complex

proton, rfq, ion-source, dipole

214

D. Raparia, G. Atoian, T. Lehn, V. LoDestro, M. Mapes, A. McNerney, J. Ritter, A. Zelenski
BNL, Upton, Long Island, New York, USA

Doubly stripped H⁻ in the low energy beam transport are capture 180 degree apart in the RF of RFQ and accelerated to the full energies. These protons are bend in the opposite direction of H⁻ after the 200 MeV drift tube linac and caused vacuum leak. A new beam dump for these stripped protons is planned

Poster MOPO100 [4.781 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO100

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO101

LINAC-multitool - an Open Source Java-toolkit

cavity, GUI, simulation, MMI

217

M. Schwarz, D. Bade, J. Corbet, H. Podlech
IAP, Frankfurt am Main, Germany

Funding: Work supported by BMBF contr. No. 05P15RFRBA and HIC for FAIR
Dedicating more precious time to advanced research instead of spending it towards timeconsuming routine tasks is a desirable goal in particle accelerator simulation and development. Requirements engineering was started at IAP in order to identify routine processes at our institute’s R&D that can be automated or simplified. Results indicated that there were several areas to consider: Bead pull measurements, data processing and visualization for the beam dynamics code LORASR, CST field map processing for the use with TraceWin, conversion between different particle distribution data formats and more. Subsequently development of the LINAC-Multitool started to rationalize these processes and replace preexisting scripts also to ensure consistency of results and increase transparency and reliability of computation. In order to guarantee maintainability, expandability and platform independence, LINAC-Multitool is programmed using Java and will be open source. This contribution presents the current state of development.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO101

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO106

New Digital LLRF System for HIT

controls, cavity, LLRF, feedback

227

E. Feldmeier, Th. Haberer, A. Peters
HIT, Heidelberg, Germany

The Heidelberg Ion Therapy Center HIT is in clinical operation since 2009. The accelerator complex consists of a linear accelerator and a synchrotron to provide carbon ions and protons for clinical use as well as helium and oxygen ions. The analog LLRF system for the linac should be replaced after more than 10 years of continuous operation. In its life-time the LLRF caused no interruption of the clinical operation with a downtime of more than 15 minutes. In order to keep the reliability in the next 10 years at least as high, a new digital LLRF system is planned. Further difficulties for the installation of a new system are due to the clinical full time usage of the accelerator and the short maintenance slots of only two days in series.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO106

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paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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MOPO107

Performance Evaluation of the RF Reference Phase Stabilization System on Fiber-optical Link for KEK e⁻/e⁺ Injector LINAC

feedback, controls, EPICS, FPGA

230

N. Liu, B. Du
Sokendai - Hayama, Hayama, Japan
D.A. Arakawa, H. Katagiri, T. Matsumoto, S. Michizono, T. Miura, F. Qiu, Y. Yano
KEK, Ibaraki, Japan
T. Matsumoto, T. Miura, F. Qiu
Sokendai, Ibaraki, Japan

KEK e⁻/e⁺ injector is the 600 m J-shaped LINAC which has 8 RF sectors. Stabilization of RF phase reference for long distance transmission is necessary for stable RF operation. In the present system, single-mode fiber-optical links without feedback control are used from sector 2 to 5. For the SuperKEKB, the phase stability requirement is within 0.1 deg. rms. The more stable RF phase reference is necessary to improve the phase stability. In this paper, a feedback control system for RF reference phase stabilization is tested for system performance evaluation. The temperature and humidity characteristics of the electric and optical components and phase stabilized optical fiber (PSOF) with different wavelengths will also be presented.

Poster MOPO107 [2.026 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO107

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paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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MOPO111

Development of New LLRF System at the J-PARC Linac

LLRF, FPGA, low-level-rf, feedback

233

K. Futatsukawa, Z. Fang, Y. Fukui
KEK, Ibaraki, Japan
Y. Sato
Nippon Advanced Technology Co., Ltd., Tokai, Japan
S. Shinozaki
JAEA/J-PARC, Tokai-mura, Japan

In the J-PARC linac, the LLRF system with the digital feedback (DFB) and the digital feedforward (DFF) was adopted for satisfying requirement of amplitude and phase stabilities. It has been operated without serious problems. However, it has been used since the beginning of the J-PARC and more than ten years have already passed since the development. The increase of the failure frequency for this system is expected. Additionally, it is difficult to maintain it for some discontinued boards of DFB and DFF and the older developing environment of software. Therefore, we are starting to study the new LLRF system of the next generation. In the present, we are exploring several possibilities of a new way and investigating each advantage and disadvantage. The project and the status of the development for the new system in the J-PARC linac LLRF are introduced.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO111

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paper received ※ 22 September 2018 paper accepted ※ 09 November 2018 issue date ※ 18 January 2019

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MOPO118

Optimized Design for a Compact Linac with Collinear Absorbing Loads at the Hust FEL-THz

cavity, FEL, radiation, electron

242

J. Jiang, G. Feng, T. Hu, Y. Lu, X.D. Tu, Y.Q. Xiong
HUST, Wuhan, People’s Republic of China
Y.J. Pei
USTC/NSRL, Hefei, Anhui, People’s Republic of China

To meet the requirement of miniaturization for high power THz radiation in the field of commercial and civil use, RF Linacs have been applied widely as beam injectors, and the Linac with collinear absorbing loads reveals the potential to achieve a tradeoff between performance and compactness. Under overall consideration of systematic conflicts, optimization choices for such Linacs involving power absorbing ability, accelerating efficiency, as well as beamline length were described in this context. Meanwhile, cold testing has been conducted to verify design parameters for the collinear absorbing loads. Furthermore, elaborated calculation of thermal power loss and integrated helical water channel cooling has been performed for the 14MeV Linac with collinear absorbing loads installed on the HUST FEL-THz, and online experiments demonstrated that both the accelerating efficiency and the water cooling performance fulfilled operation demands.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO118

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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MOPO120

Improvement of the Linear Part in the Tuner System of ADS 25 MeV Linac

experiment, proton, cavity, superconducting-cavity

250

L. Zhang, Z. Gao, L.B. Liu, F.F. Wang, B. Zhang
IMP/CAS, Lanzhou, People’s Republic of China

Tuner system is the indispensable part of ADS high current proton superconducting linac. It influences the working frequency of superconducting cavity of particle accelerator. To completely understand the working situa-tion of the tuner system and analyses the problems existing in it, experiments of linear part were fully conducted.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO120

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paper received ※ 09 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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MOPO124

Details of the Manufacturing Processes of the ESS-DTL Components

DTL, alignment, coupling, vacuum

260

P. Mereu, F. Borotto Dalla Vecchia, C. Mingioni, M. Nenni, R. Panero
INFN-Torino, Torino, Italy
A. Battistello, P. Bottin, D. Conventi, L. Ferrari, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
A.G. Colombo
INFN- Sez. di Padova, Padova, Italy

The Drift Tube Linac (DTL) of the European Spallation Source (ESS) is designed to operate at 352.2MHz with a duty cycle of 4% (3 ms pulse length, 14 Hz repetition period) and will accelerate a proton beam of 62.5mA pulse peak current from 3.62 to 90 MeV. This paper presents the details of the manufacturing processes with quality control reports of the components of the DTL.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO124

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paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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TU1A01

Challenges in Superconducting Accelerating Module Design and Construction for High Power Proton Accelerators

cryomodule, cavity, vacuum, alignment

280

C. Madec
CEA/DSM/IRFU, France

CEA is engaged in the construction of the IFMIF, SARAF and ESS superconducting linacs and in particular in the design and production of a their accelerating cryomodules: 1 low-beta half-wave 176 MHz resonators for IFMIF, 4 low-beta half-wave 176 MHz resonators for SARAF and 30 medium and high-beta elliptical cavity resonators for ESS. The developments of these RF cryomodules, although at various stages, are led in parallel by the cryomodule team at CEA-Saclay, including all RF, mechanical, thermal, cryogenic, integration and QA-QC aspects in a global approach which attempts to optimise synergies and lessons learnt between these projects. A status report will be presented describing the common approaches and methods, and the systemic particularities of each project.

Slides TU1A01 [11.896 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU1A01

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paper received ※ 14 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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TU1A03

Status and Issues (Microphonics, LFD, MPS) with TRIUMF ARIEL e-Linac Commissioning

cavity, TRIUMF, MMI, electron

286

S.R. Koscielniak, M. Alcorta, F. Ames, E. Chapman, K. Fong, B. Humphries, O.K. Kester, D. Kishi, R.E. Laxdal, Y. Ma, T. Planche, M. Rowe, S.D. Rädel, V.A. Verzilov, Z.Y. Yao
TRIUMF, Vancouver, Canada

The ARIEL electron linac (e-linac) is designed to generate cw beams of up to 30 MeV and 10 mA for delivery to a photo-convertor. Bremsstrahlung induced fission of a production target yields neutron-rich rare isotope beams to be supplied to the ISAC experimental facilities. The beam power will eventually reach 300 kW, and a machine protection system (MPS) with 10 μs rapidity is essential. The e-linac, which adopts 1.3 GHz, 2K SRF technology, is composed of a 10 MeV single-cavity injector cryomodule (EINJ) and a 20 MeV two-cavity accelerator cryomodule (EACA). The latter has vector-sum control of two cavities driven from a single klystron. Beam commissioning of these systems is ongoing since 2016. The magnetic optics and MPS commissioning to 10 MeV is reported herein. Beam has been accelerated up to 25 MeV, and thread-ed to the high energy dump (EHD). A campaign to investigate microphonics driving terms, LN2 disturb-ances, and a ponderomotive instability in the EACA, is underway.

Slides TU1A03 [9.683 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU1A03

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paper received ※ 17 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TU1A05

Seamless Quarter Wave Resonators for HIE ISOLDE

cavity, ISOL, niobium, cryomodule

292

W. Venturini Delsolaro, A. Miyazaki
CERN, Geneva, Switzerland

The HIE-ISOLDE post accelerator consists of 4 cryomodules with 5 niobium-coated Quarter Wave Reso-nators (QWR) each. The standard manufacturing tech-nique was to machine the inner and outer conductor sepa-rately, to shrink-fit the 2 pieces and to apply an electron beam welding at the interface. Due toμcracks, ob-served on some of the cavities around the welds, we took the decision to explore the possibility of a seamless de-sign. First cavities became available in late 2017 and were then cold-tested in the vertical cryostat. These seam-less coated quarter wave resonators have shown some of the highest Q-values of all HIE-ISOLDE cavities in the acceptance tests. Furthermore, we studied the cavity per-formance with different compensations of the earth mag-netic field and different temperature gradients upon cool down. These tests have demonstrated record-breaking RF surface fields for the Nb/Cu technology. This paper re-views the design and fabrication and reports on the cold tests results of seamless quarter wave resonators, and of possible future applications

Slides TU1A05 [30.518 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU1A05

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paper received ※ 11 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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TU2A01

First Acceleration of Heavy Ion Beams with a Superconducting Continuous Wave HIM/GSI CW-linac

cavity, heavy-ion, acceleration, emittance

297

W.A. Barth, K. Aulenbacher, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu
HIM, Mainz, Germany
K. Aulenbacher
IKP, Mainz, Germany
W.A. Barth, M. Heilmann, A. Rubin, A. Schnase, S. Yaramyshev
GSI, Darmstadt, Germany
M. Basten, M. Busch, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany

First acceleration of heavy ion beams with a superconducting continuous wave HIM/GSI CW-Linac After successful RF-testing of a new superconducting Linac RF-cavity at GSI Helmholtzzentrum für Schwerionenforschung and a short commissioning and ramp up time of some days, this 15-gaps Crossbar H-cavity accelerated first time heavy ion beams with full transmission up to the design beam energy. The design acceleration gain of 3.5 MV inside a length of less than 70 cm has been verified with heavy ion beam of up to 1.5 particle mkA. The measured beam parameters show a nice beam quality. The machine commissioning with beam is a milestone of the R&D work of Helmholtz Institute Mainz and GSI in collaboration with Goethe University Frankfurt in development of the superconducting heavy ion continuous wave linear accelerator CW-Linac.

Slides TU2A01 [3.385 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU2A01

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TU2A04

Progress Report on LIPAC

rfq, MMI, SRF, cavity

308

M. Sugimoto, T. Akagi, T. Ebisawa, Y. Hirata, R. Ichimiya, A. Kasugai, K. Kondo, S. Maebara, K. Sakamoto, T. Shinya
QST, Aomori, Japan
P. Abbon, N. Bazin, B. Bolzon, N. Chauvin, S. Chel, R. Gobin, J. Marroncle, B. Renard
CEA/IRFU, Gif-sur-Yvette, France
L. Antoniazzi, L. Bellan, D. Bortolato, M. Comunian, E. Fagotti, F. Grespan, M. Montis, A. Palmieri, A. Pisent, F. Scantamburlo
INFN/LNL, Legnaro (PD), Italy
P.-Y. Beauvais, H. Dzitko, D. Gex, R. Heidinger, A. Jokinen, I. Moya, G. Phillips
Fusion for Energy, Garching, Germany
P. Cara
IFMIF/EVEDA, Rokkasho, Japan
D. Gavela, D. Jiménez-Rey, I. Kirpitchev, J. Mollá, P. Méndez, I. Podadera, D. Regidor, R. Varela, M. Weber
CIEMAT, Madrid, Spain
J. Knaster
F4E, Barcelona, Spain
G. Pruneri
Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova, Italy

International Fusion Materials Irradiation Facility (IFMIF) is the neutron source for simulating fusion reactor environment using two 40 MeV/125 mA CW D⁺ beams. LIPAc facility is under construction in Rokkasho for validating 9 MeV/125 mA CW linac technology as a prototype of the IFMIF accelerator. Commissioning of 5 MeV CW RFQ is underway after the completion of installation of RFQ, MEBT, diagnostic plate. low power beam dump, RF power system and their auxiliaries. As the first step, high power RF conditioning is planned to complete in early 2018 and beam commissioning will start with stepwise approach at the same time. The status of LIPAc construction for preparing 9 MeV acceleration and results of RFQ beam commissioning are presented.

Slides TU2A04 [9.651 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU2A04

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paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO001

About the Limits for the Accelerated Beam Current in the LUE-200 Linac of the IREN Facility

klystron, electron, neutron, acceleration

320

A.P. Sumbaev
JINR, Dubna, Moscow Region, Russia
A.M. Barnyakov, A.E. Levichev
BINP SB RAS, Novosibirsk, Russia

The beam current loading of the accelerating fields is discussed for the linear accelerator LUE-200 of IREN facility. LUE-200 electron Linac consits of two disk loaded travelling wave accelerating structure with the operating frequency of 2856 MHz and power compression SLED-type system. The limits by the accelerated beam current are defined for different pulse durations of the beam current and RF power. The calculated results are discussed and compared with the measurements.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO001

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paper received ※ 12 September 2018 paper accepted ※ 22 January 2019 issue date ※ 18 January 2019

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TUPO003

Development of CW Heavy Ion Linac at IMP

DTL, MMI, cavity, rfq

326

X. Yin, H. Du, Y. He, Q.Y. Kong, X.N. Li, Z.S. Li, L.Z. Ma, J. Meng, C. Qian, L.T. Sun, K.D. Wang, J.X. Wu, J.W. Xia, W.J. Xie, Z. Xu, Y.Q. Yang, Q.G. Yao, Y.J. Yuan, W. Zhang, X.Z. Zhang, Y. Zhang, H.W. Zhao, Z.Z. Zhou
IMP/CAS, Lanzhou, People’s Republic of China
J.E. Chen, S.L. Gao, G. Liu, Y.R. Lu, Z. Wang, X.Q. Yan, K. Zhu
PKU, Beijing, People’s Republic of China

A new heavy ion linac as the injector for the Separated Sector Cyclotron (SSC), named SSC-Linac[1], is being under constructed at the national laboratory Heavy Ion Research Facility in Lanzhou (HIRFL). The SSC-Linac mainly consists of a 4-rod RFQ and three IH-DTL cavities which can accelerate ion of A⁄q≤7from 3.73 keV/u to 1.025 MeV/u. Both of themoperating at 53.667MHz had been developed. In the commissioning, ions weresuccessfully accelerated to 0.295MeV/u by IH-DTL1. The beam commissioningof the IH-DTL2 which can accelerate the ion to 0.586MeV/u will come soon. In this paper, the recent R&D progress of the SSC-Linac including the development of key components and the beam commissioning results arepresented.

Slides TUPO003 [7.335 MB]

Poster TUPO003 [0.810 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO003

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO004

RF Design and Cold Model Measurement of an IH-DTL for HIMM Injector

DTL, cavity, simulation, quadrupole

329

H. Du, Q.Y. Kong, Z.S. Li, K.D. Wang, X. Yin
IMP/CAS, Lanzhou, People’s Republic of China

An interdigital H-mode drift tube linac (IH-DTL) will be constructed as a postinjector linac for the Heavy Ion Medical Machine (HIMM). Its resonant frequency, injec-tion and final energies are determined from beam dynamics and hardware parameters considerations of the entire machine to be 162.5MHz, 600keV/u and 4MeV/u, respectively. The beam duty cycle of the injector linac is less than 0.1% based on the injection requirements of the synchrotron. Beam dynamics and RF structure design and optimize of the IH-DTL has been finished. The maximum surface electric field is less than 2.0-times the Kilpatric limit for accelerating C⁴⁺ beam. This IH-DTL contains 42 accelerating gaps and two focusing quadrupole triplets. In order to examine the field distribution of the IH-DTL which reaches the length of 3.17m, an aluminum alloy 1:1 cold model cavity with 4 moveable tuners and 2 empty focusing magnet shell was constructed. The relative intertube-distance errors are less than ±50μm. The measurements show that the gap voltage values can match the CST-MWS simulating results within relative difference of ±3% by adjusting the 4 moveable tuners.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO004

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paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO012

Compact Multipurpors Facility - BELA

rfq, neutron, ion-source, ECR

349

T. Kulevoy, R. Fatkullin, A.V. Kozlov, G. Kropachev, D.N. Selesnev, A.I. Semennikov, A. Sitnikov
ITEP, Moscow, Russia
T. Kulevoy
MEPhI, Moscow, Russia
T. Kulevoy
NRC, Moscow, Russia

In ITEP the project of multidiscipline facility Based on ECR ion source and Linear Accelerator (BELA) is started. The injector part of facility is based on combinations of ECR ion source and dc H⁺ and He⁺ source will provide the multi beams irradiation of the reactor materials for modeling experiments. The cw RFQ and following DTL will enable the set of experimental activity both for fun-damental physics and for practical applications.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO012

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO013

Commissioning Status of the LIGHT Development Machine

MMI, rfq, DTL, proton

352

G. De Michele, J. Adam, D. Aguilera Murciano, A. Benot-Morell, R. Bonomi, F. Cabaleiro Magallanes, M. Caldara, G. D’Auria, A. Degiovanni, M. Esposito, S. Fanella, D. Fazio, D.A. Fink, Y. Fusco, M. Gonzalez, P. Gradassi, L. Kobzeva, G. Levy, G. Magrin, A. Marraffa, A. Milla, R. Moser, P. Nadig, G. Nuessle, A. Patino-Revuelta, T. Rutter, F. Salveter, A. Samoshkin, L. Wallet
A.D.A.M. SA, Meyrin, Switzerland
M. Breitenfeldt, C. Candolfi, G. Castorina, M. Cerv, V.A. Dimov, M.T. Gallas, S. Gibson, A. S. Gonzalez, Ye. Ivanisenko, A. Jeff, V. F. Khan, S. Magnoni, J.L. Navarro Quirante, H. Pavetits, P. Paz Neira, S.G. Soriano, P. Stabile, K. Stachyra, A. Valloni, C. Zannini
AVO-ADAM, Meyrin, Switzerland
G. D’Auria
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy

ADAM (Application of Detectors and Accelerators to Medicine) is a CERN spin-off company currently working on the construction and testing of the LIGHT (Linac for Image-Guided Hadron Therapy) machine. LIGHT is an innovative high-frequency linac based proton therapy system designed to accelerate protons up to 230 MeV: it consists of three different linac sections i.e. a 750 MHz Radio Frequency Quadrupole (RFQ) accelerating the beam up to 5 MeV; a 3 GHz Side Coupled Drift Tube Linac (SCDTL) up to 37.5 MeV; and a 3 GHz Coupled Cavity Linac (CCL) section up to 230 MeV. The compact and modular design is based on cutting edge technologies developed for particle colliders and adapted to the needs of hadron therapy beams. The LIGHT development machine is currently being built at CERN and this paper describes its design aspects and its different stages of installation and commissioning.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO013

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO014

TRIUMF ISAC LINAC Developments and Upgrades

controls, ISAC, operation, TRIUMF

355

Z.T. Ang, T. Au, Y. Bylinskii, K. Fong, J.J. Keir, D. Lang, R.E. Laxdal, R. Leewe, B.S. Waraich, Z.Y. Yao, Q. Zheng, V. Zvyagintsev
TRIUMF, Vancouver, Canada

TRIUMF ISAC accelerator complex is in consists of ISAC-I room temperature linac and ISAC-II superconducting linac structure. ISAC-I linac has seventeen RF systems in operation for about twenty years, and ISAC-II linac has forty superconducting QWR RF cavities in operation for more than ten years. A small ISAC booster 3-gap structure at 11.78 MHz located in upstream of RFQ has been designed and installed for energy matching to RFQ. A sliding mode extremum seeking control for LLRF control was developed and implemented in operation. Six of DTL systems have been working in the control mode. Two of them had been commissioning and in operation one and half year reliably. RFQ, two more DTL system, HEBT rebuncher and DSB buncher system will be upgraded in the sliding mode control soon. Twenty ISAC-II SBC superconducting cavity RF power amplifiers were upgraded from YV-229 triode tube amplifier into solid state amplifier(SSA). The prototype and four SSAs have been commissioned in 2017 and in operation successfully. The rest of 16 SSA have been tested in RF lab and installed for operation at the mid of this year.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO014

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paper received ※ 04 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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TUPO017

The New Light Ion Injector for NICA

cavity, diagnostics, LLRF, rfq

362

B. Koubek, M. Basten, H. Höltermann, H. Podlech, U. Ratzinger, A. Schempp, R. Tiede
BEVATECH, Frankfurt, Germany
A.V. Butenko, D.E. Donets, B.V. Golovenskiy, A. Govorov, K.A. Levterov, D.A. Lyuosev, A.A. Martynov, V.A. Monchinsky, D.O. Ponkin, K.V. Shevchenko, I.V. Shirikov, E. Syresin
JINR, Dubna, Moscow Region, Russia
C. K. Kampmeyer, H. Schlarb
DESY, Hamburg, Germany

Within the upgrade scheme of the injection complex of the NICA project and after a successful beam commissioning of a heavy ion linac, Bevatech GmbH will build a first part of a new light ion linac as an injector for the Nuclotron ring. The linac will provide a beam of polarised protons and light ions with a mass to charge ratio up to 3 and an energy of 7 MeV/u. The mandate of the Linac does not only include the hardware for the accelerating structures, focusing magnets and beam diagnostic devices, but also the LLRF control soft- and hardware based on the MicroTCA.4 standard in collaboration with the MicroTCA Technology Lab at DESY. An overview of the Linac is presented in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO017

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paper received ※ 10 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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TUPO020

Microphonics Investigation of ARIEL e-Linac Cryomodules

cavity, cryomodule, pick-up, damping

370

Y. Ma, K. Fong, M. Keikha, J.J. Keir, D. Kishi, S.R. Koscielniak, D. Lang, R.E. Laxdal, R.R. Nagimov, Z.Y. Yao, Q. Zheng, V. Zvyagintsev
TRIUMF, Vancouver, Canada
L. Lilje
DESY, Hamburg, Germany

Now the stage of the 30MeV portion of ARIEL (The Advanced Rare Isotope Laboratory) e-Linac is under commissioning which includes an injector cryomodule (ICM) and the 1st accelerator cryomodule (ACM1) with two cavities configuration. In this paper, the progress of the microphonics investigation and suppression of ICM and ACM1 is presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO020

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO022

Manufacturing of X-band Accelerating Structures: Metrology Analysis and Process Capability

controls, GUI, collider, linear-collider

374

J. Sauza-Bedolla, S. Atieh, N. Catalán Lasheras
CERN, Geneva, Switzerland

The fabrication tolerances of RF components are essential for CLIC X-band accelerating structures to perform efficiently. On one hand, the capability of high power accelerating structures depends on the shape accuracy and the asperity of the inner surfaces, when microwaves pass through the cavity. On the other hand, surface flatness and dimensional tolerances are necessary to guarantee a correct assembly process. Hence, the discs that build up the structure require sub-micrometre specifications and, in order to meet all the needs, ultra-precision machining using single crystal diamond tools is mandatory. This paper shows the analysis of the metrology results of the fabrication of 118 discs (4 accelerating structures). Dimensional and form tolerances are studied following the production order to find drifts in the production and to predict the impact on the assembly process. Finally, process capability is evaluated.

Poster TUPO022 [2.987 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO022

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paper received ※ 10 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO023

Preserving Micron Tolerances Through the Assembly Process of an X-band Accelerating Structure

cavity, simulation, HOM, software

377

J. Sauza-Bedolla, N. Catalán Lasheras, A. Grudiev, S. Lebet, E. Rodriguez-Castro, P. Sobrino-Mompean, A. Solodko, K. T. Szypula
CERN, Geneva, Switzerland
H. Bursali
IZTECH, Izmir, Turkey

The CLIC structures are designed for operating at X-Band, 2π/3 traveling wave mode with a loaded 100 MV/m gradient. Mechanical tolerances, at the submicron level, are required to satisfy the RF design constraints and beam dynamics and are reachable using ultra-precision diamond machining. However, inherent to the manufacturing process, there is a deviation from the nominal specifications and as a result; incorrect cavity dimensions produce a less efficient linac. Moreover, the assembly process increase the difference from the original geometry. As part of a cost and manufacturability optimization of the structures for mass production, this study aims to identify a correlation between frequency deviations and geometrical errors of the individual discs of the accelerating structures caused by the production process. A sensitivity analysis has been carried out to determine the most critical parameters. Cell frequency deviations have been monitored by bead pull measurements before and after bonding. Several accelerating structure prototypes have been tested to determine our assumptions and to assess if the assembly process preserves the tight tolerances achieved by machining.

Poster TUPO023 [1.443 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO023

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paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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TUPO028

Retreatment of European XFEL Series Cavities at DESY as Part of the Repair of European XFEL Accelerating Modules

cavity, FEL, vacuum, SRF

384

S. Sievers, N. Krupka, D. Reschke, S. Saegebarth, J. Schaffran, M. Schalwat, P. Schilling, M. Schmökel, N. Steinhau-Kühl, E. Vogel, H. Weise, B. van der Horst
DESY, Hamburg, Germany
M. Wiencek
IFJ-PAN, Kraków, Poland

For the European XFEL 10² accelerating modules were built and tested. Several accelerating modules had to be reworked due to different kinds of non-conformities. The extent of this rework varied greatly. At the end of production four accelerating modules could not be qualified in time before the tunnel installation was to be finished in September 2016. Meanwhile the cavity strings of two of these accelerating modules have been disassembled in the DESY clean room. The cavities have been retreated at DESY either by additional high pressure water rinsing or BCP flash chemical treatment. All cavities were vertically tested and 15 out of 16 were qualified for the reassembly of the cavity strings. One accelerating module will be reassembled completely and tested until the end of 2018; the other will follow in the first half of 2019. We report on retreatment procedures and performance of these cavities.

Poster TUPO028 [1.662 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO028

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paper received ※ 11 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO030

Precise Evaluation of Characteristic of the Multi-layer Thin-film Superconductor Consisting of NbN and Insulator on Pure Nb Substrate

cavity, superconducting-RF, radio-frequency, SRF

391

R. Katayama, Y. Iwashita, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
C.Z. Antoine
CEA/IRFU, Gif-sur-Yvette, France
A. Four
CEA/DRF/IRFU, Gif-sur-Yvette, France
H. Hayano, T. Kubo, T. Saeki
KEK, Ibaraki, Japan
H. Ito
Sokendai, Ibaraki, Japan
R. Ito, T. Nagata
ULVAC, Inc, Chiba, Japan
H. Oikawa
Utsunomiya University, Utsunomiya, Japan

In recent years, it has been pointed out that the maximum accelerating gradient of a superconducting RF cavity can be pushed up by coating the inner surface of the cavity with a multilayer thin-film structure that consists of alternating insulating and superconducting layers. In this structure, the principal parameter that limits the performance of the cavity is the critical magnetic field or effective Hc1 at which vortices start penetrating into the superconductor layer, and it is predicted to depend on the combination of the film thickness. We made samples that have NbN/SiO2 thin-film structure on pure Nb substrate with several thicknesses of NbN film deposited using DC magnetron sputtering method. Here, we report the measurement results of effective Hc1 of the NbN sample with a thickness of 200 nm by using the third-harmonic voltage method. In addition, we report the preliminary results to evaluate the dependence of the effective Hc1 on the thickness of the NbN film in the range 50 nm-200 nm.

Slides TUPO030 [0.305 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO030

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paper received ※ 18 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO032

First Test Results of Superconducting Twin Axis Cavity for ERL Applications

cavity, HOM, SRF, operation

398

H. Park, S.U. De Silva, J.R. Delayen
ODU, Norfolk, Virginia, USA
A. Hutton, F. Marhauser, H. Park
JLab, Newport News, Virginia, USA

Superconducting cavities with two beam pipes had been proposed in the past for energy recovery linac applications. The relatively complex geometry of those cavities presented a serious challenge for fabrication and surface processing. Main concerns have now been overcome with the production and successful RF testing of a new elliptical twin-axis cavity proposed by Jefferson Lab and optimized by the Center for Accelerator Science at Old Dominion University in the frame of a DoE accelerator stewardship program. The cavity design provides uniform accelerating or decelerating fields for both beams. This paper describes the cavity design, fabrication experience, and the first cold RF test results and explores potential applications especially for Jefferson Lab s EIC (JLEIC).

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO032

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paper received ※ 20 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO039

Tests of the Balloon Single Spoke Resonator

cavity, multipactoring, TRIUMF, simulation

417

Z.Y. Yao, J.J. Keir, D. Kishi, D. Lang, R.E. Laxdal, H. Liu, Y. Ma, B. Matheson, B.S. Waraich, Q. Zheng, V. Zvyagintsev
TRIUMF, Vancouver, Canada

A balloon variant of the single spoke resonator (SSR) has been designed, fabricated and tested. The cavity is the SSR1 prototype for the Rare Isotope Science Project (RISP) in Korea. It is specifically designed to reduce the likelihood of multipacting barriers near the operating point. A systematic multipacting study leads to a novel geometry, a spherical cavity with re-entrant irises and a spoke. Other than eliminating multipacting around operational gradient, the balloon shape also provides competitive RF parameters and robust mechanical structure. Cryostat cold tests demonstrated cavity performance on each design aspect. The cold tests will be reported in this paper.

Slides TUPO039 [25.279 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO039

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paper received ※ 17 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO045

Optimization of Dual Axis Asymmetric Cavity for Energy Recovery Linac

cavity, HOM, coupling, SRF

435

Ya.V. Shashkov, A.M. Bulygin, M. Gusarova
MEPhI, Moscow, Russia
I.V. Konoplev
JAI, Oxford, United Kingdom
F. Marhauser
JLab, Newport News, Virginia, USA
A. Seryi
SLAC, Menlo Park, California, USA

Funding: The reported study was funded by RFBR according to the research project № 18-302-00990
Optimization of the dual axis asymmetric cavity was performed to minimize the ratio of the peak magnetic and electric fields values to the accelerating voltage, to increase the distance between operating and neighbouring modes as well as to reduce the manufacturing cost of the cavity. To reach the goals several solutions have been suggested bringing the ratios to the acceptable values and leading to simplification of the manufacturing of the structure.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO045

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO055

Next Generation Nb3Sn SRF Cavities for Linear Accelerators

cavity, operation, SRF, site

462

R.D. Porter, D.L. Hall, M. Liepe, J.T. Maniscalco
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
T. Arias, P. Cueva, D.A. Muller, N. Sitaraman
Cornell University, Ithaca, New York, USA

Niobium-3 Tin (Nb3Sn) is a very promising alternative material for SRF accelerator cavities. The material can achieve higher quality factors, higher temperature operation and potentially higher accelerating gradients (~ 96 MV/m) compared to conventional niobium. This material is formed by vaporizing Sn in a high temperature vacuum furnace and letting the Sn absorb into a Nb substrate to form a 2-3 um Nb3Sn layer. Current Nb3Sn cavities produced at Cornell achieve Q ~ 10¹⁰ at 4.2 K and 17 MV/m. Here we present a summary of the current performance of Nb₃Sn cavities at Cornell and recent progress in improving the accelerating gradient.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO055

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paper received ※ 20 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO058

Cool Down Studies for the LCLS-II Project

cavity, network, SRF, cryomodule

470

M. Ge, M. Liepe
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
D. Gonnella
SLAC, Menlo Park, California, USA
J. Sears
Cornell University, Ithaca, New York, USA

The quality factor of the nitrogen-doped SRF cavities for the LCLS-II project are strongly impacted by cool down speed. A sufficiently fast cool down speed can produce large thermal gradient across a cavity and sufficiently expel magnetic flux when the cavity wall passes from the normal-conducting to the superconducting state. However, instrumentation in LCLS-II production cryomodules has been kept at a minimum, and additional information during the cool down of the modules is therefore desirable. In this work, we study if and how RF data can be used during cavity cool-down to determine the transition speeds of the individual cavities in the LCLS-II linac.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO058

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paper received ※ 19 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO079

Numerical and Experimental Study of H⁻ Beam Dynamics in J-PARC LEBT

rfq, MMI, emittance, solenoid

519

T. Shibata, K. Ikegami, Y. Liu, K. Ohkoshi, M. Otani
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
A. Miura, H. Oguri, K. Shinto
JAEA/J-PARC, Tokai-mura, Japan
F. Naito, K. Nanmo, A. Takagi
KEK, Tokai, Ibaraki, Japan

Negative hydrogen ion (H⁻) beam dynamics in J-PARC Low Energy Beam Transport (LEBT) has been investigated by numerical modeling which calculates particle transport with effect of space charge and collision processes. Understandings of H⁻ beam transport in LEBT is important for high transmission rate from Ion Source (IS) to Radio Frequency Quadrupole (RFQ) in J-PARC in higher beam current in future. In 2017, 45 mA beam current of H⁻ has been extracted from IS in J-PARC user operation which has been increased from 30 mA in last 2 years. The beam current is planned to be increased to 50 mA in the next upgrade. As the beam current increase, IS/LEBT commissioning becomes more difficult because of the higher space charge (SC). Especially in J-PARC, vacuum pressure is around 10^-5 Pa by 15 mmf orifice located in the center of LEBT. The orifice prevents residual gas injection from IS to LEBT/RFQ and thus produces stronger SC effect. In the presentation, numerical results are compared with actual results from J-PARC Linac beam commissioning. A comparison of the results shows that location of the 15 mmf orifice results in two peaks of RFQ transmission rate against SOL currents.

Slides TUPO079 [0.968 MB]

Poster TUPO079 [1.699 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO079

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO083

Beam Dynamics for the FAIR p-Linac Ladder RFQ

rfq, emittance, simulation, ion-source

522

M. Syha, U. Ratzinger, M. Schuett
IAP, Frankfurt am Main, Germany

After the successful measurements with a 0.8 m prototype a 3.3 m Ladder-RFQ is under construction at IAP, Goethe University Frankfurt. It is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the p-Linac at FAIR. Along the acceleration section modulation parameter, aperture and synchronous phase all course (quasi-)linear, which differentiates this design approach from other designs developed at IAP. The ratio of transversal vane curvature radius to mid-cell radial aperture as well as the vane radius itself are constant, which favors a flat voltage distribution along the RFQ. This was verified by implantation of the modulated vane geometry into MWS-CST RF field simulations. The development of adequate beam dynamics was done in close collaboration with the IAP resonator design team. The Los Alamos RFQGen-code was used for the RFQ design and the beam dynamics simulations.

Poster TUPO083 [0.932 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO083

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paper received ※ 12 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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TUPO084

Beam Dynamics Simulations for the New Superconducting CW Heavy Ion LINAC at GSI

cavity, heavy-ion, cryomodule, experiment

525

M. Schwarz, M. Basten, M. Busch, H. Podlech
IAP, Frankfurt am Main, Germany
K. Aulenbacher
IKP, Mainz, Germany
K. Aulenbacher, W.A. Barth, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu
HIM, Mainz, Germany
W.A. Barth, M. Heilmann, A. Rubin, A. Schnase, S. Yaramyshev
GSI, Darmstadt, Germany

Funding: Work supported by BMBF contr. No. 05P15RFRBA, EU Framework Programme H2020 662186 (MYRTE) and HIC for FAIR
For future experiments with heavy ions near the coulomb barrier within the super-heavy element (SHE) research project a multi-stage R&D program of GSI/HIM and IAP is currently in progress. It aims for developing a supercon-ducting (sc) continuous wave (CW) LINAC with multiple CH cavities as key components downstream the High Charge State Injector (HLI) at GSI. The LINAC design is challenging due to the requirement of intense beams in CW mode up to a mass-to-charge ratio of 6, while covering a broad output energy range from 3.5 to 7.3 MeV/u with unchanged minimum energy spread. Testing of the first CH-cavity in 2016 demonstrated a promising maximum accelerating gradient of E_a = 9.6 MV/m; the worldwide first beam test with this sc multi-gap CH-cavity in 2017 was a milestone in the R&D work of GSI/HIM and IAP. In the light of experience gained in this research so far, the beam dynamics layout for the entire LINAC has recently been updated and optimized.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO084

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO085

Modelling of Beam Parameters of RF Linac for GBS-ELI-NP

simulation, quadrupole, gun, emittance

528

P.S. Tracz
IFIN-HH, Bucharest - Magurele, Romania

The Gamma Beam System at the ELI-NP (Extreme Light Infrastructure - Nuclear Physics) currently being constructed in Magurele/Bucharest, Romania will be a high-brilliance advanced source of gamma rays based on laser Compton back-scattering. For a successful operation of the GBS a high brightness low emittance electron beam is of crucial importance. The warm RF linac is designed in two stages - one with the beam up to 300 MeV, and another one about 720 MeV. The S-band photo-injector is combined with a C-band linac. The beam is transported by transfer lines to the interaction points. In this paper we report the results of computer simulations of the electron beam transport in the low energy linac and transfer line up to the low energy interaction point (IP1). The simulation model makes it possible to predict the beam parameters to be recuperated in case of failure of any magnetic or accelerating elements as well as it enables to determine the optimal parameters of replaced components. It will be used for the development of the Gamma Beam System in the future.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO085

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO088

Measurement of Diagnostics Response by RF Parameters for Hard X-ray Line in PAL-XFEL*

FEL, diagnostics, gun, timing

531

H. Yang
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: *This work is supported by MSIP, Korea.
PAL-XFEL is a hard x-ray (HX) and soft x-ray (SX) FEL machine to generate 2.5 - 15 keV FEL in the HX line and 0.28 - 1.2 keV FEL in the SX line. The HX line consists of an e-gun, a laser heater, S-band accelerators, an X-band linearizer, three bunch compressors (BC), and a dog-leg line. PAL-XFEL maintains the stable operation and FEL delivery with more than 98% availability due to machine stabilities including RF modules. In order to investigate the stable operation, we measure the diagnostics response for bunch charge monitors, energy beam position monitors, bunch length monitors, and a FEL intensity with a photon beam position monitor by RF parameters - RF amplitude and phase for an e-gun, accelerators, and a linearizer. In this paper, we present mainly corresponding RF parameters for e-beam and FEL jitters by this measurement and matrix analysis.

Poster TUPO088 [0.281 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO088

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paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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TUPO091

Beam Break Up Instability Analysis for Cavities, Linacs and Energy Recovery Linacs

dipole, cavity, polarization, focusing

537

V. Volkov, V.M. Petrov
BINP SB RAS, Novosibirsk, Russia

This analyze argue that BBU instability both in separate cavities and in Linacs or ERLs is going due to the consequence of fundamental property of dipole modes. ’Head-tail’ bunch instability has also the same nature. New BBU instability testing methods are described and analytically proved in the article.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO091

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paper received ※ 14 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO095

Beam Loading with the First Rebuncher of Spiral2, First Measurements

cavity, simulation, controls, experiment

546

M. Lechartier, R. Ferdinand, J.F. Leyge
GANIL, Caen, France

In the SPI2 project the middle energy line (LME) is equiped with a radio frequency qupole and three Rebunchers. The subject of this article is to measure and characterise the effect of the beam loading on the first Rebuncher cavity.

Poster TUPO095 [1.146 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO095

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paper received ※ 20 September 2018 paper accepted ※ 15 January 2019 issue date ※ 18 January 2019

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TUPO101

Design of Practical HSC Type Injector for Cancer Therapy

rfq, DTL, cavity, injection

557

C.C. Xing, T. He, C.X. Li, J. Li, L. Lu, L. Yang
IMP/CAS, Lanzhou, People’s Republic of China

The Hybrid single cavity(HSC), which is designed for 20 mA beam acceleration, is a new HSC Type Injector for Cancer Therapy. Its designed particle, resonant frequency, injection and final energies are designed from beam-optics considerations of the entire system to be C⁶⁺, 100MHz, 20keV/u and 0.6MeV/u. In order to achieve these requirements, keeping the Maximum surface electric field to less than 1.9-times the Kilpatrick limit, the RFQ becomes about 1.2 m long and the DTL is about 2.5 m long. The total efficiency of transmission is more than 80%.

Poster TUPO101 [0.345 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO101

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO112

Calculation of Electron Beam Dynamics in Four Accelerating Stations for JINR Linear Electron Accelerator LINAC-200

electron, solenoid, detector, acceleration

566

A. Sledneva, V. Aleksandrov, V.V. Kobets
JINR, Dubna, Moscow Region, Russia

In the Joint Institute for Nuclear Research a Test Stand with an electron beam generated by the linear accelerator LINAC-200 with the energy up to 200 MeV is being constructed to investigate properties of accelerating and semiconducting structures for advanced detectors, a radiation resistance of detectors based on gallium arsenide semiconductor, to study a free electron laser and to do other applied for work. The technical characteristics of the LINAC-200 accelerator make it possible to create an advanced system of test beams for scientific and methodological studies of detectors on its basis. Four accelerating stations with maximum beam energy up to 200 MeV are put into operation. The work is being carried out for experiments with electron test beams with energy up to 800 MeV. This work presents the calculation results of the magnetic field of the focusing solenoidal system and electron beam dynamics in accelerating stations. In addition, the results on the formation of the electron beam with optimal parameters to be captured in further accelerating sections.

Poster TUPO112 [1.176 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO112

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paper received ※ 12 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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TUPO113

Beam Dynamics Studies Through Dielectric THz Accelerating Structures

GUI, simulation, vacuum, accelerating-gradient

569

R. Apsimon, G. Burt, A.L. Healy, S.P. Jamison
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
R.B. Appleby, E.J.H. Smith
UMAN, Manchester, United Kingdom
A. Latina
CERN, Geneva, Switzerland

As conventional RF accelerating schemes approach the physical limit of accelerating gradient, the accelerator community is increasingly looking at novel accelerating techniques to overcome these limitations. Moving from the RF to the THz frequency range, higher acceleration gradients of high energy beams can be achieved in compact structures. Beam dynamics studies are crucial as part of the design of novel accelerating structures to maximise the output beam current as well as the accelerating gradient. In this paper we present beam dynamics simulations through dielectric lined waveguide structures using novel techniques to simulate broadband signals for particle tracking studies in RF-Track. The beam parameters through the structure are optimised and we study the dynamics of general broadband accelerating structures.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO113

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paper received ※ 13 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO114

Beam Dynamics Studies for the CSNS DTL Due to a Quadrupole Fault

lattice, DTL, MMI, quadrupole

573

J. Peng, M.T. Li, Y.D. Liu, X.H. Lu, X.B. Luo
CSNS, Guangdong Province, People’s Republic of China
Y.W. An, S. Fu, L. Huang, M.Y. Huang, Y. Li, Z.P. Li, S. Wang, S.Y. Xu, Y. Yuan
IHEP, Beijing, People’s Republic of China

The China Spallation Neutron Source(CSNS) accelera-tor systems is designed to deliver a 1.6GeV, 100kW pro-ton beam to a solid metal target for neutron scattering research. It consists of a 50keV H⁻ Ion Source, a 3MeV Radio Frequency Quadrupole (RFQ), an 80MeV Drift Tube Linac (DTL), and a 1.6GeV Rapid-cycling Synchro-tron (RCS). The DTL consists of four tanks. In 2017, three of four tanks have been commissioned successfully, and beam has been accelerated to 61MeV with nearly 100% transmission. However, in July 2017, one quadrupole contained in the drift tube was found fault, the beam transmission decreased to 80%. A new lattice has been designed and the 100% transmission has recovered. In January 2018, the last tank of the DTL has been commissioned and accelerated the H⁻ beam to the design energy of 80MeV for the first time. The commissioning progress and the measurement results before and after lattice adjustment will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO114

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO115

Beam Parameters Measurement and Correction in CSNS Linac

emittance, MMI, DTL, injection

576

Z.P. Li, Y. Li
IHEP, Beijing, People’s Republic of China
J. Peng
CSNS, Guangdong Province, People’s Republic of China

All the beam parameters of China Spallation Neutron Source (CSNS) linac had achieved the acceptance goals in January 2018 after a 2-year commissioning. Parameters of the H⁻ beam were carefully studied and corrected. Beam energy was measured and the energy dispersion are reduced. Transverse emittance are obtained by different tools and methods. Linear optics measurements and corrections were carried out under varied beam energies and peak intensities.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO115

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TUPO119

A Diagnostics Box for the Linear Accelerator of Institute for Research in Fundamental Science (IPM)

diagnostics, electron, dipole, solenoid

581

S. Sanaye Hajari, M. Bahrami, H. Behnamian, S. Kasaei, H. Shaker
IPM, Tehran, Iran
S. Ahmadiannamin
ILSF, Tehran, Iran
F. Ghasemi
NSTRI, Tehran, Iran

The IPM linac is an 8 MeV (up gradable to 11 MeV) electron linear accelerator under development at Institute for Research in Fundamental Sciences, Tehran, Iran. The design and construction of the linac is nearly finished and it is in the commissioning stage. The commissioning is planned in several phase of different energy ranging from 50 keV to 8 MeV. At each phase appropriate diagnostics is required in order to investigate the linac performance. A diagnostics box including a scintillator view screen, a dipole magnet, and a focusing solenoid is designed to diagnose the beam longitudinal and transverse parameters in wide range of energy. These parameters are the beam transverse profile, size, position, emittance and the energy spectrum.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO119

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paper received ※ 12 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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TUPO127

Activities at the Linac4 Test Stand

emittance, rfq, electron, extraction

587

J.-B. Lallement, V. Bencini, S.B. Bertolo, F.D.L. Di Lorenzo, J. Lettry, A.M. Lombardi, C.M. Mastrostefano, D. Noll, M. O’Neil
CERN, Geneva, Switzerland

Linac4, the new CERN H⁻ injector to the Proton Synchrotron Booster, has been commissioned and has delivered a beam intensity and quality calculated to be sufficient to produce the standard beams for LHC and the high intensity beams for ISOLDE when connected. The beam current is nevertheless half of what is foreseen and the problem has been identified at the low energy end, between the extraction and the matching to the RFQ. The Linac4 test stand is being used to address this issue by testing different extraction geometries and different plasma generators. A fast method to access the current in the RFQ acceptance has been put in place. This paper reports the results of the measurements obtained so far.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO127

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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WE1A05

SwissFEL Linac Commissioning Status, Current Performance and Future Plans

FEL, electron, experiment, operation

605

P. Craievich
PSI, Villigen PSI, Switzerland

SwissFEL, the hard x-ray free-electron laser facility at PSI, is in an advanced commissioning phase. The commissioning of the 5.8 GeV Linac started in 2016 and the first FEL pilot-experiments were performed at a reduced beam energy in the end of 2017. In 2018, it is foreseen to progressively increase the electron beam energy and photon energy up to the maximum design values, interleaved by several FEL pilot experiments. This paper gives an overview of the commissioning progress including the achieved machine performance and first operational experience.

Slides WE1A05 [10.370 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-WE1A05

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paper received ※ 18 September 2018 paper accepted ※ 09 October 2018 issue date ※ 18 January 2019

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WE1A06

Pulse-to-pulse Beam Modulation for 4 Storage Rings with 64 Pulsed Magnets

power-supply, controls, positron, electron

609

Y. Enomoto, K. Furukawa, T. Kamitani, F. Miyahara, T. Natsui, M. Satoh, K. Yokoyama, M. Yoshida
KEK, Ibaraki, Japan
H.S. Saotome
Kanto Information Service (KIS), Accelerator Group, Ibaraki, Japan
S. Ushimoto
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan

The KEK injector linac has delivered electrons and positrons for particle physics and photon science experiments for more than 30 years. It is planned to inject electron and positron beams with energies from 2.5 GeV to 7 GeV pulse-by-pulse at 50 Hz into the dual ring SuperKEKB collider and two light source storage rings. As the beam quality requirement from SuperKEKB is demanding, the beam orbit and optics conditions have to be maintained precisely. To that end 64 newly designed pulsed magnets were installed. Quadrupole magnets with the inductance of 1 mH are driven by power supplies with pulses up to 330 A and 0.5 ms, which recover the energy stored in coils up to 65%. Orbit corrector magnets with the inductance of 3 mH are driven with bipolar pulsed power supplies up to 10 A. Those power supplies are controlled under the event-based synchronized controls and monitored pulse-by-pulse, and are confirmed to have the stability over weeks within 0.1%. The details of the design and the operational performance will be reported.

Slides WE1A06 [6.694 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-WE1A06

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paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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WE2A01

First Acceleration at FRIB

rfq, MMI, cryomodule, emittance

615

G. Pozdeyev
FRIB, East Lansing, Michigan, USA

FRIB is now moving to commissioning interleaved with installation. The ECR, low energy transport and RFQ have been commissioned with beam By the time of the conference the 4K cryogenic system and first three beta 0.041 QWR cryomodules will be commissioned with first cold acceleration. The talk would focus on the hardware and beam performance.

Slides WE2A01 [11.425 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-WE2A01

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paper received ※ 17 September 2018 paper accepted ※ 09 October 2018 issue date ※ 18 January 2019

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WE2A03

Construction Status of the Superconducting Linac at RIKEN RIBF

cavity, vacuum, cryomodule, DTL

620

N. Sakamoto, H. Imao, O. Kamigaito, K. Kusaka, H. Okuno, K. Ozeki, K. Suda, T. Watanabe, Y. Watanabe, K. Yamada
RIKEN Nishina Center, Wako, Japan
H. Hara, T. Yanagisawa
MHI, Hiroshima, Japan
E. Kako, H. Nakai, H. Sakai, K. Umemori
KEK, Ibaraki, Japan
A. Miyamoto, K. Sennyu
MHI-MS, Kobe, Japan

An upgrade project of the RIKEN Heavy-Ion Linac, RILAC, is under going, which aims at the further investigation of the super-heavy elements and production of radioactive isotopes for medical applications. In this project, a new superconducting ECR ion source and superconducting RF (SRF) booster linac are being developed and constructed. The SRF linac consists of 10 quarter-wavelength resonator operated at 73 MHz, that are contained in three cryomodules. The construction status, including the first vertical test results, will be given in this paper.

Slides WE2A03 [23.169 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-WE2A03

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paper received ※ 14 September 2018 paper accepted ※ 17 October 2018 issue date ※ 18 January 2019

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WE2A04

Commissioning of New SARAF RFQ and Design of New Linac

rfq, proton, operation, emittance

626

A. Perry, D. Berkovits, H. Dafna, B. Kaizer, J. Luner, J. Rodnizki, A. Shor, I. Silverman, L. Weissman
Soreq NRC, Yavne, Israel
A. Bechtold, P. Niewieczerzal
NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany
R.D. Duperrier, G. Ferrand, B. Gastineau, M. Jacquemet, C. Madec, N. Pichoff, D. Uriot
CEA/IRFU, Gif-sur-Yvette, France
S. Ladegaillerie, Th. Plaisant
IRFU, CEA, University Paris-Saclay, Gif-sur-Yvette, France

Status of the CEA desing of the future Saraf linac (title to be revised)

Slides WE2A04 [7.096 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-WE2A04

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paper received ※ 17 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TH1A05

Jitter Study for the APS Linac Photo-injector Beam

laser, timing, simulation, experiment

647

D. Hui, M. Borland, J.M. Byrd, Y. Sun
ANL, Argonne, Illinois, USA

Funding: *Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The APS Linac photo-injector can deliver high brightness electron beams to the Linac Extension Area (LEA) for beam experiments such as TESSA (Tapering Enhanced Stimulated Superradiant Amplification). Beam jitter in the device-under-test (DUT) area of the LEA can adversely affect the quality of data for such experiments. In this paper, a start-to-end simulation of jitter is studied. Sources of jitter include photo-cathode drive-laser arrival time, laser energy, and RF phases and voltages of the photo-cathode gun and accelerating cavities. It is found that at the DUT the relative mean energy jitter is the most significant concern, and that improvements in the Linac RF voltage stability can help to reduce it. RMS energy spread are more sensitive to the laser timing and charge jitter. The laser timing jitter itself can be compressed by the magnetic chicane by a factor of 5.6.

Slides TH1A05 [4.377 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1A05

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paper received ※ 10 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TH1P01

Commissioning of CERN LINAC4

MMI, injection, proton, emittance

658

A.M. Lombardi
CERN, Geneva, Switzerland

This talk reviews the commissioning effort of CERN’s new H⁻ linear accelerator, Linac4, which is presently undergoing a beam quality and reliability run. Linac4 will be connected to the LHC proton injector chain during the next long LHC shutdown (LS2) and will then replace the 50MeV proton Linac2.

Slides TH1P01 [4.591 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1P01

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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TH1P02

Injection Complex Development for the NICA-project at JINR

rfq, acceleration, booster, injection

663

A.V. Butenko, B.V. Golovenskiy, A. Govorov, A.D. Kovalenko, V.A. Monchinsky, A.V. Smirnov, G.V. Trubnikov
JINR, Dubna, Moscow Region, Russia
D.E. Donets, K.A. Levterov, D.A. Lyuosev, A.A. Martynov, V.V. Mialkovskiy, D.O. Ponkin, K.V. Shevchenko, I.V. Shirikov, A.O. Sidorin
JINR/VBLHEP, Dubna, Moscow region, Russia
H. Höltermann, H. Podlech, U. Ratzinger, A. Schempp
BEVATECH, Frankfurt, Germany
T. Kulevoy
ITEP, Moscow, Russia
S.M. Polozov
MEPhI, Moscow, Russia

The new accelerator complex Nuclotron-based Ion Collider fAcility (NICA) is still under construction at JINR, Dubna. Two Linacs should serve as injectors for this new accelerator complex. LU-20 as an Alvarez based lLinac for light polarized ions and the new Heavy Ion Linear Accelerator HILAC dedicated to heavy ion beam operation. Main results of the HILAC commissioning with carbon beam from the laser ion source should be discussed. Besides a new R&D-project is ongoing to developed superconducting cavities for a new light ion linear injector which created to upgrade the injector complex. The current status of linac design and results of the beam dynamics simulations and SRF technology developments should be presented as well.

Slides TH1P02 [8.162 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1P02

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paper received ※ 17 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TH1P03

New Trends in Proton and Carbon Therapy Linacs

cavity, DTL, rfq, proton

666

S. Benedetti
CERN, Geneva, Switzerland

In the last years, many developments have contributed to make feasible an all linac solution for proton and carbon ion therapy, with typical output energies of about 200 MeV and 400 MeV/u, respectively. The efficient beam matching of the source to the high-energy linacs, operating at 3 GHz, represents one of the major challenges. With the successful test of a 750 MHz RFQ at CERN, this possibility starts to be a reality. At the same time CERN is testing a high-gradient S-band cavity, successfully exceeding the accelerating gradient goal of 50 MV/m - more than twice what has been obtained before - and paving the way to more compact medical facilities. In this paper, some of the most significant projects involving linear accelerators for hadron therapy will be presented.

Slides TH1P03 [3.378 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1P03

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paper received ※ 11 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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THPO001

Design Study on CEPC Positron Damping Ring System

damping, injection, positron, emittance

672

D. Wang, Y.L. Chi, J. Gao, D.J. Gong, C. Meng, G. Pei, J.R. Zhang
IHEP, Beijing, People’s Republic of China

The primary purpose of CEPC damping ring is to reduce the transverse phase spaces of positron beam to suitably small value at the beginning of linac and hence reduce the beam loss in the booster. Before damping ring, an energy spread compression structure is designed to match the RF acceptance of damping ring. A longitudinal bunch length control is also necessary to meet the energy spread requirement in the linac by a bunch compressor system after the damping ring. Both designs for damping ring and energy/bunch compressors are discussed in this paper.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO001

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO004

Pulsed Operation of CEBAF for JLEIC Injection

cavity, injection, electron, beam-loading

682

J. Guo, J.M. Grames, R. Kazimi, F. Lin, T. E. Plawski, R.A. Rimmer, H. Wang
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
JLab Electron Ion Collider (JLEIC) is planning to use the recently upgraded 12 GeV CEBAF 1497 MHz SRF CW recirculating linac as a full-energy injector for the electron collider ring. The JLEIC electron injection requires 3-4µs long bunch trains with a 20-400ms spacing in between, resulting in uneven beam loading for the CW CEBAF. With the high beam current in JLEIC collider rings, the low duty factor of injection also requires to a very high pulsed beam current from CEBAF, exacerbating the transient beam loading issue. In this paper, we will present CEBAFs detailed pulsed operation scheme for JLEIC injection, as well as some experimental results at CEBAF.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO004

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paper received ※ 20 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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THPO006

Status of 650 MHz SRF Cavity for eRHIC SRF Linac

cavity, SRF, HOM, collider

688

W. Xu, I. Ben-Zvi, Y. Gao, D. Holmes, P. Kolb, G.T. McIntyre, R. Porqueddu, K.S. Smith, F.J. Willeke, Q. Wu, A. Zaltsman
BNL, Upton, Long Island, New York, USA

Funding: This work is supported by LDRD program of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. DOE.
A 5-cell 650 MHz SRF cavity was designed for eRHIC SRF linac. One Cu cavity was fabricated for HOM damping study, and one Nb cavity was fabricated for SRF studies. Through various post-processing recipes and vertical tests, the SRF study includes high Q-value study for ERL SRF linac and high gradient study for recirculating linac. This paper reports the HOM damping measurement on the Cu cavity and preliminary vertical test results.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO006

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paper received ※ 22 August 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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THPO008

Long-term 0peration with Beam and Cavity Performance Degradation in Compact-ERL Main Linac at KEK

cavity, operation, vacuum, cryomodule

695

H. Sakai, T. Furuya, E. Kako, T. Konomi, T. Miura, F. Qiu, K. Umemori
KEK, Ibaraki, Japan

We developed ERL main linac cryomodule for Compact ERL (cERL) in KEK. The module consists of two 9-cell 1.3 GHz superconducting cavities. After construction of cERL recirculation loop, beam operation was started in 2013 Dec. First electron beam of 20 MeV successfully passed the main linac cavities. Beam current increased step by step and currently reached to 1mA (CW). Energy recovery has successfully achieved. However, field emission was one of the problems for long term operation. Therefore, the performance of the SRF cavities through long term beam operation has been investigated. In this paper, we express the measurement of the cavity performances and its degradation during long term beam operation. We also described the details of the cavity performance degradation and some trial for the cavity performance recovery.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO008

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO011

First Energy Recovery Operation at the S-DALINAC: RF Control Stability Measurements

controls, operation, cavity, beam-loading

706

M. Steinhorst, M. Arnold, N. Pietralla
TU Darmstadt, Darmstadt, Germany
C. Burandt
HIM, Mainz, Germany

Funding: *Supported by the DFG through GRK 2128.
One of the main research instruments at the institute for nuclear physics at the TU Darmstadt is the recirculating superconducting linear accelerator S‑DALINAC. Many improvements were implemented since the first recirculated beam in 1991. One of the major enhancement is the upgrade from a twice to a thrice recirculating scheme in 2015/2016. With this upgrade the operation mode can be changed between a conventional accelerating operation and energy recovery linac (ERL) mode by an 180° rf phaseshift of the beam done via a path length variation of the arcs in the second recirculation. ERL operation was not possible when the rf control system for the superconducting structures was set up in 2010. Therefore the current rf control system is not optimized for this kind of operation and so it had to be tested during ERL operation in order to also demonstrate its capability of this operation mode. In August 2017 a first once recirculating ERL operation was achieved. During this operation measurements regarding the rf control stability and the demand of rf power were done. This contribution is discussing this measurements and possible improvements for future energy recovery beam times.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO011

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO012

Once Recirculating Energy Recovery Linac Operation of S-DALINAC*

operation, simulation, acceleration, recirculation

710

M. Arnold, J. Birkhan, J. Pforr, N. Pietralla, F. Schließmann, M. Steinhorst
TU Darmstadt, Darmstadt, Germany
F. Hug
KPH, Mainz, Germany

Funding: *Work supported by DFG through GRK 2128 and INST163/383-1/FUGG
Since 1991 the superconducting S-DALINAC is running in recirculating operation. It was built in a twice recirculating layout. A third recirculation beam line was added in 2015/2016 as an upgrade. The new recirculation beam line is installed in-between the two existing beam lines. It houses a path length adjustment system capable of changing the length of the orbit for recirculation by up to 10 cm corresponding to the RF wave length at the operation frequency of 3 GHz and consequently to a freedom of RF phase adjustment by 360°. The new beam line can, thus, be utilized for an accelerating operation or, if the change in phase is set to 180°, for an energy recovery linac (ERL) operation. In August 2017 the S-DALINAC was first operated in once recirculating ERL mode and became the first running ERL in Germany. Different aspects of this ERL run have been observed and were evaluated. The layout of the S-DALINAC allows a once or twice recirculating ERL mode. Beam dynamics simulations for both modes have been conducted or are currently under investigation. This contribution will discuss the once recirculating ERL operation, its results, and future plans concerning ERL measurements.

Poster THPO012 [0.708 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO012

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paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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THPO018

Building a 12GHz Traveling Wave Accelerating Structure Brazed Through Irises

controls, cavity, collider, electron

721

V.A. Dolgashev, G.B. Bowden, M. Dal Forno, A.A. Haase
SLAC, Menlo Park, California, USA
A. Grudiev
CERN, Geneva, Switzerland
H. Zha
TUB, Beijing, People’s Republic of China

Accelerating structures are usually manufactured by precision turning of individual cells combined with precision milling for complex parts such as rf power couplers. These multiple parts are staked and brazed into a complete structure. We consider an alternative approach: precision milling of multiple cells and couplers into metal blocks that comprise halves or quadrants of the complete structure. We successfully produced a 12~GHz Compact Linear Collider (CLIC) main linac accelerating structure prototype using this method. A previous prototype was designed as an open structure with a gap between cell irises. Here we describe a different approach, an accelerating structure which is brazed through irises. It is based on a multi-cell traveling wave structure designed at CERN for PSI, so called "T24 PSI 12 GHz". This brazed-through irises structure was built at SLAC for high power tests at CERN. Here we describe the details of this process.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO018

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paper received ※ 19 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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THPO021

Research on X Ray Characteristics Produced by Highenergy Picosecond Electron Beam Shooting

target, electron, photon, radiation

729

X.D. Zhang, X.P. Ouyang, B. Sun, X.J. Tan, X.F. Weng
NINT, Xi’an, People’s Republic of China

Funding: Supported by National Natural Science Foundation of China(11375142)
The X ray sources based on electron linac can produce X-rays with high energy, concentrated directions, and strong penetrating power, which have been widely applied in various fields. An electronic linear accelerator which has been built at present can provide an electron beam with energy of 120 MeV and pulse width of picosecond. The electron beam shooting at the metal targets can produce ultra-fast pulsed X-rays in the order of picosecond. In this paper, the pulse X ray characteristics are studied through simulating electron beam shooting at four metal targets with different thickness of Au, Ta, U, W and Pb by MCNPX program. The calculation shows that the X-rays can reach about 1010p/pulse and the pulse width can reach about picosecond level, when the pulsed electron beams with energy of 120 MeV ,charge of 0.5nC and pulse width of picosecond shooting at Ta targets. The yield and time width of pulsed X-rays are related to the diameter and thickness of the target.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO021

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paper received ※ 11 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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THPO022

Development Progress of the H⁺/H⁻ Linear Accelerators at Tsinghua University

DTL, neutron, proton, rfq

732

Q.Z. Xing, C.B. Bi, C. Cheng, C.T. Du, T.B. Du, X. Guan, Q.K. Guo, Y. Lei, P.F. Ma, S. Shuai, R. Tang, X.W. Wang, X.D. Xudong, H.Y. Zhang, S.X. Zheng
TUB, Beijing, People’s Republic of China
W.Q. Guan, Y. He, J. Li
NUCTECH, Beijing, People’s Republic of China
W.L. Liu, B.C. Wang, Z.M. Wang, Y. Yang, C. Zhao
NINT, Shannxi, People’s Republic of China

We present, in this paper, the development progress of the 13MeV proton linac for the Compact Pulsed Hadron Source (CPHS), and the 7MeV H⁻ linac injector for the synchrotron of the Xi’an 200MeV Proton Application Facility (XiPAF).

Slides THPO022 [4.421 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO022

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO026

The Multi-physics Analysis of Dual-beam Drift Tube Linac

DTL, cavity, simulation, operation

735

T. He, L. Lu, W. Ma, L.P. Sun, C.C. Xing, X.B. Xu, L. Yang
IMP/CAS, Lanzhou, People’s Republic of China

The DB-DTL prototype is proposed to validate the fea-sibility of multi-beam accelerator in middle energy region. The main parameters are listed in Table.1. The DB-DTL will operate as pulse injector with the capacity of accelerating proton from 0.56 MeV to 2.5 MeV. The 35.83 kW normalized power dissipation of DB-DTL dis-sipated on the cavity internal surface will heat the cavity and cause cavity temperature rise and structural defor-mation, which will lead to resonant frequency shifting. The cooling water takes away the power to resolve this problem. In this paper, detailed multi-physics field simu-lation of DB-DTL is performed by using ANSYS multi-physics, which is a coupled electromagnetic, thermal and structural analysis.

Poster THPO026 [0.759 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO026

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO028

Magnetic Field Measurement and Analysis for Drift Tube Linac of CSNS

DTL, quadrupole, cavity, drift-tube-linac

738

B. Li, M.X. Fan, A.H. Li, P.H. Qu, Y. Wang, X.L. Wu
CSNS, Guangdong Province, People’s Republic of China
Q. Chen, K.Y. Gong, W. Kang, H.C. Liu, J.X. Zhou
IHEP, Beijing, People’s Republic of China

Funding: The National Natural Science Foundation of China(11105166)； Youth Innovation Promotion Association（2015011）
A 324MHz Alvarez-type Drift Tube Linac (DTL) is used to accelerate the H⁻ ion beam from 3 to 80 MeV with peak current 15mA for China Spallation Neutron Source (CSNS). DTL is composed by 36 meters cavity and 161 DTs, the DT magnet coil adopted SAKAE structure with compact, smaller aperture. Magnetic field is measured by self-developed high precision rotating coil measurement system. This paper introduces the rotating coil measure-ment system simply and presents the 161 DTs magnetic field measurement results comprehensively, include mag-netic field center offset, integral magnetic field, higher-order harmonics. In addition, cooling test result of magnet coil is also presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO028

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paper received ※ 31 August 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO029

Quality Factor and Power Loss of the CSNS DTL

cavity, DTL, operation, simulation

741

P.H. Qu, M.X. Fan, A.H. Li, B. Li, J. Peng, Y. Wang, X.L. Wu
CSNS, Guangdong Province, People’s Republic of China
Q. Chen, K.Y. Gong, H.C. Liu
IHEP, Beijing, People’s Republic of China

An Alvarez-type Drift tube linac (DTL) was utilized to accelerate the H⁻ ion beam of up to 15mA peak current from 3 to 80MeV of China Spallation neutron source (CSNS). For ease of manufacturing and measurement, the CSNS DTL was divided into four independent cavities. The Q factor of four cavities were given, including the measurement results of low-power[1] and high-power[2], and several reasons for the low Q factor of the cavity in the measurement process were analysed. During the op-eration of the DTL, the frequent alarm of the water flow switch causes the power of the cavity to fall to 0. Esti-mate the power loss of each component, under the cir-cumstances of ensuring adequate water flow, reduce the alarm threshold of the water flow switch of some compo-nents to improve the stability of the system.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO029

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paper received ※ 22 August 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO030

Operation Experience of the CSNS DTL

DTL, MMI, operation, vacuum

744

H.C. Liu, Q. Chen, S. Fu, K.Y. Gong
IHEP, Beijing, People’s Republic of China
M.X. Fan, A.H. Li, B. Li, J. Peng, P.H. Qu, Y. Wang, X.L. Wu
CSNS, Guangdong Province, People’s Republic of China

The China Spallation Neutron Source (CSNS) Drift tube linac (DTL) accelerates H⁻ beam from 3 to 80MeV with 4 independent tanks. The 80MeV beam acceleration was achieved in January 2018. The linac is a key to the reliability of the whole CSNS facility since all the beams stop when these upstream facilities fail. Many efforts have been made for DTL reliable operation. This paper presents the operation experience learned in DTL com-missioning.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO030

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paper received ※ 28 August 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO032

CSNS Linac Beam Commissioning Tools and Experience

MMI, DTL, emittance, software

750

Y. Li, Z.P. Li, S. Wang
IHEP, Beijing, People’s Republic of China
J. Peng
CSNS, Guangdong Province, People’s Republic of China

The China Spallation Neutron Source (CSNS) successfully accelerated the H⁻ beam to 80 MeV in January 2018, marking a key progress in the beam commissioning. One of the keys to success is the development and use of software tools. XAL, a Java-based software infrastructure originally developed by SNS was applied for CSNS beam commissioning. We have developed and transplanted many applications based on XAL. Some of the applications for the Linac are described ,and some experiences are shared.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO032

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO034

Experimental Study of Tuning Method on a Model Alvarez DTL Cavity for CPHS Project

cavity, experiment, DTL, drift-tube-linac

756

Y. Lei, X. Guan, R. Tang, X.W. Wang, Q.Z. Xing, S.X. Zheng
TUB, Beijing, People’s Republic of China

This article is devoted to the experimental study of tun-ing method for an Alvarez-type drift tube linac (DTL) of the Compact Pulse Hadron Source (CPHS) project at Tsinghua University. The biperiodic structure based on the post couplers are introduced to overcome the instability of the Alvarez DTL tank which is used to operate in 0 (or 2π) mode. The experimental method and results are pre-sented, and the tuning scheme for the formal CPHS DTL is summarized from the tuning experiment.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO034

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO035

Tuning and Low Power Test of the 325 MHz IH-DTL at Tsinghua University

DTL, proton, simulation, cavity

759

R. Tang, C.T. Du, X. Guan, Y. Lei, P.F. Ma, K.D. Man, C.-X. Tang, X.W. Wang, Q.Z. Xing, W.B. Ye, H.Y. Zhang, S.X. Zheng
TUB, Beijing, People’s Republic of China
J. Li
NUCTECH, Beijing, People’s Republic of China

An interdigital H-mode drift tube linac (IH-DTL), which accelerates proton beam from 3 MeV to 7 MeV has been designed and assembled at Tsinghua University. There are 8 plungers in the 1 m tank and one co-axial coupler is used to feed the power. The frequency is tuned to 325 MHz. The field distribution is measured by the bead perturbation method. Finally, the gap voltage error has been tuned to be smaller than ±3.0%, which satisfies the design requirement. The Q factor of the tank is 7000 while the power dissipation is 244 kW. Details of the low power test is presented.

Poster THPO035 [1.268 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO035

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO036

Error Study of CPHS DTL after Assembly

DTL, rfq, alignment, emittance

763

P.F. Ma, C.T. Du, X. Guan, Q.K. Guo, Y. Lei, R. Tang, X.W. Wang, Q.Z. Xing, S.X. Zheng
TUB, Beijing, People’s Republic of China
B.C. Wang
NINT, Shannxi, People’s Republic of China

The Compact Pulsed Hadron Source (CPHS) at Tsinghua University is one multi-purpose pulsed neutron source. The injector of the CPHS is a linac, which mainly consists of a source, a low-energy beam transport line (LEBT), a radio frequency quadrupole (RFQ) and a drift tube linac (DTL). The error study of the DTL for CPHS is presented in this paper. The error study can provide the field tolerances in the DTL cavity and the alignment tolerance between the RFQ and DTL.

Poster THPO036 [2.645 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO036

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paper received ※ 06 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO040

Operation Experiences of the J-PARC Linac

operation, DTL, cavity, target

774

K. Hasegawa
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

The J-PARC linac has delivered beam to users since 2008. As of 2018, the linac provides a 40 mA beam at an energy of 400 MeV to the following Rapid Cycling Synchrotron. We have had many issues to impede high availability during the operation. One of them was troubles of high voltage power supply of klystrons. The other category is related to vacuum property in accelerating cavities. The vacuum pumps were reinforced at the RFQ#1 in 2009. The cleaning of the inside surface of some acceleration cavities were performed after the big earthquake in 2011. The cooling water flow rate drop had been a long-time issue. We modified a cooling system to take better flow balances. As a result of these improvement, the availability is approximately 92% or more in these days. However, we have encountered another issue due to some aging components. The operation experiences and availability improvement at the J-PARC linac will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO040

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paper received ※ 19 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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THPO043

ESS Normal Conducting Linac Status and Plans

rfq, ion-source, DTL, proton

781

E. Sargsyan, H. Danared, F. Hellström, G. Hulla, Ø. Midttun, J.S. Schmidt
ESS, Lund, Sweden
I. Bustinduy, N. Garmendia, J.L. Muñoz
ESS Bilbao, Zamudio, Spain
L. Celona, S. Gammino, L. Neri
INFN/LNS, Catania, Italy
A.C. Chauveau, B. Pottin
CEA/IRFU, Gif-sur-Yvette, France
F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
P. Mereu
INFN-Torino, Torino, Italy

The European Spallation Source (ESS) uses a linear accelerator to deliver the high intensity proton beam to the target station for producing intense beams of neutrons. The average beam power is 5 MW with a peak beam power at the target of 125 MW. The normal conducting linear accelerator (linac) operating at 352.21 MHz accelerates a proton beam of 62.5 mA from 0.075 to 90 MeV. It consists of an ion source, Low Energy Beam Transport (LEBT), Radio Frequency Quadrupole (RFQ), Medium Energy Beam Transport (MEBT), and Drift Tube Linac (DTL). The design, construction and testing of those structures is done by European partner labs as an in-kind contribution to the ESS project. This paper presents the status and plans for the ESS normal conducting linac.
E.Sargsyan for the ESS NC Linac collaboration team

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO043

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO045

Tuning Esperience on the ESS DTL Cold Model

DTL, cavity, interface, alignment

784

F. Grespan, A. Baldo, P. Bottin, G.S. Mauro, A. Palmieri, A. Pisent
INFN/LNL, Legnaro (PD), Italy
P. Mereu, M. Mezzano
INFN-Torino, Torino, Italy

An aluminum model of the ESS DTL tank 2 has been delivered to INFN-LNL in december 2017. The tank is 7.1 m long, equipped with movable tuners and movable post couplers. The purpose of this DTL model is to verify the RF design choices (in particular on the first 2 tanks where the Post coupler distribution is irregular) as well as implement and debug algorithms and procedure for stabilization and tuning. The preparatory simulation work and the results of measurements campaign are here presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO045

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO046

Status of the FAIR Proton Linac

proton, rfq, DTL, injection

787

C.M. Kleffner, S. Appel, R. Berezov, J. Fils, P. Forck, M. Kaiser, K. Knie, C. Mühle, S. Puetz, A. Schnase, G. Schreiber, A. Seibel, T. Sieber, V. Srinivasan, J. Trüller, W. Vinzenz, C. Will
GSI, Darmstadt, Germany
A. Almomani, H. Hähnel, U. Ratzinger, M. Schuett, M. Syha
IAP, Frankfurt am Main, Germany

As part of the accelerator chain for antiproton production of the FAIR facility, a special high-intensity short pulsed 325 MHz proton linac is being developed. The Proton linac is designed to deliver a beam current of 70 mA with an energy of 68 MeV. A 2.45 GHz ECR source designed for the generation of 100 mA beams with an energy of 95 keV is currently being tested at CEA/Saclay. The production of the structure of the IAP ladder RFQ is nearly completed. First parts of the RFQ vacuum chambers have been successfully copperplated at the GSI. Seven Thales Klystrons have been delivered to GSI at the beginning of 2018 and are nearly ready for use. The completion of the setup of the HV modulator is expected end of the year 2018. The state of procurement and development of further accelerator components will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO046

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paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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THPO047

SPIRAL2 Injector Commissioning

rfq, emittance, cavity, diagnostics

790

R. Ferdinand, M. Di Giacomo, H. Franberg, O. Kamalou, J.-M. Lagniel, G. Normand, A. Savalle, F. Varenne
GANIL, Caen, France
D. Uriot
CEA/DRF/IRFU, Gif-sur-Yvette, France

The SPIRAL2 injector is composed of two ion sources (p/d and heavy ions up to A/Q=3) followed by a 730 keV/u RFQ. Beam commissioning has started in 2014 in parallel with the superconducting linac and HEBT installations. The RFQ beam commissioning started soon after the first RF conditioning done in October 2015. This paper describes the RFQ beam measurements done on the diagnostic plate for the reference particles (H⁺, 4He2+ and recently 18O6+) and the difficulties encountered for the RFQ commissioning at the A/Q=3 field level.

Slides THPO047 [7.846 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO047

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO048

Low Power Measurement of a 1300-MHz RFQ Cold Model

rfq, emittance, experiment, acceleration

794

Y. Kondo, T. Morishita, J. Tamura
JAEA/J-PARC, Tokai-mura, Japan
M. Otani
KEK, Ibaraki, Japan

Funding: This work is supported by JSPS KAKENHI Grant Number 17K18784.
A muon linac development for a new muon g-2/EDM experiment is now going on at J-PARC. Muons from the muon beam line (H-line) of the J-PARC muon facility are once stopped in a silica aerojel target and room temperature muoniums are evaporated from the aerogel. They are dissociated with the lasers to be the ultra slow muons, then accelerated up to 212 MeV using a linear accelerator. The low energy part of this muon linac consists of a 324-MHz RFQ and an IH DTL. The frequency is increased to 1296 MHz at the following CCL section. We propose to replace the low energy section to a 1300-MHz RFQ to simplify the configuration of the muon linac. The 1300-MHz RFQ will be extremely small compared to conventional RFQs, therefore we made a cold model to proof the feasibility of this scheme. In this paper, the result of low-power measurement of the 1300-MHz RFQ cold model is described.

Slides THPO048 [2.160 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO048

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO049

Field Tuning of a Radio-frequency Quadrupole Using Full 3D Modeling

rfq, cavity, insertion, simulation

798

T. Morishita, K. Hasegawa, Y. Kondo, H. Oguri
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
M. Otani
KEK, Ibaraki, Japan

The radio-frequency quadrupole linac (RFQ) is operating in the frontend of the J-PARC linac to accelerates 50 mA negative hydrogen beams from 0.05 MeV to 3 MeV. As a backup, the spare RFQ has been fabricated in 2018. The vane-voltage ramping is adopted to improve the acceleration efficiency so that the cross-sectional shape is adjusted longitudinally to produce the designed voltage distribution. Then, the three-dimensional cavity models including modulations and cutbacks were created in CST Micro-Wave Studio. The vane-base widths and cutback depths were optimized to produce the desired vane-voltage distribution. In the final tuning, the heights of the stub turners were also determined based on the tuner responses obtained from the full 3D models. In this paper, the detailed design process of the cavity dimensions and the result of the low-power measurements are described.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO049

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO054

Recent Progress of a CW 4-rod RFQ for the SSC-LINAC

rfq, MMI, emittance, controls

814

Z.S. Li, Y. Cong, H. Du, Y. He, L. Jing, Q.Y. Kong, X.N. Li, J. Meng, G.D. Shen, K.D. Wang, Z.J. Wang, W. Wei, J.X. Wu, J.W. Xia, H.M. Xie, W.J. Xie, Z. Xu, J.C. Yang, Y.Q. Yang, X. Yin, Y.J. Yuan, Y. Zhang
IMP/CAS, Lanzhou, People’s Republic of China
Y.R. Lu
PKU, Beijing, People’s Republic of China

The SSC-LINAC is under design and construction as a linear injector for the Separated-Sector Cyclotron (SSC) of the Heavy Ion Research Facility at Lanzhou (HIRFL). The continuous-wave (CW) 4-rod radio-frequency quad-rupole (RFQ) of the SSC-LINAC has important progress in past years. In the autumn of 2016, the cavity has been operated with 35 kW on CW mode in automatic RF con-trolled mode during RF power commissioning, which is needed to accelerate 238U³⁴⁺ beams. The beam transmis-sion efficiency, transverse emittance and energy spread has been obtained in beam commissioning. In this paper, the results of experiments will be presented and discussed in detail.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO054

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO057

Redesign of CERN Linac3 RFQ for Lead 29+

rfq, emittance, cavity, simulation

818

S. Benedetti, G. Bellodi, J.-B. Lallement, A.M. Lombardi
CERN, Geneva, Switzerland

CERN Linac3 is at the start of the CERN Heavy Ion Facility, providing 4.2 MeV/u ion beams to the Low Energy Ion Ring (LEIR). It mostly accelerates 208Pb²⁹⁺, though in recent years runs were performed with 40Ar¹¹⁺ and 129Xe²²⁺, in view of the increasing interest of the physics community towards lighter ions experiments. In the framework of the LHC Injectors Upgrade (LIU) project, measurements and beam dynamics simulations showed that a transmission bottleneck of Linac3 is represented by the RFQ. As this accelerator was originally designed for 208Pb²⁵⁺, the lower beam rigidity of the heavy ions currently in use and planned for the future permits a redesign of the RFQ optics aimed at increasing its transverse acceptance, and thus the transmitted beam current. A study of this has been performed, and the methodology adopted and the results are presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO057

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paper received ※ 11 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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THPO058

RF Design of a High-frequency RFQ Linac for PIXE Analysis

rfq, simulation, cavity, proton

822

H.W. Pommerenke, A. Bilton, A. Grudiev, A.M. Lombardi, S.J. Mathot, E. Montesinos, M.A. Timmins, M. Vretenar
CERN, Geneva, Switzerland
H.W. Pommerenke, U. van Rienen
Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany

Funding: This work has been sponsored by the Wolfgang Gentner Program of the German Federal Ministry of Education and Research (grant no. 05E12CHA).
Protons with an energy of few MeV are commonly used for Ion Beam Analysis of materials, in particular with the Proton Induced X-ray Emission technique (PIXE). Because of its non-damaging character, PIXE is used in a variety of fields, in particular for the diagnosis of cultural heritage artwork. A compact accelerator based on a high frequency RFQ (Radio Frequency Quadrupole) linac has been designed and is being built at CERN. The length of the RFQ is only one meter and it allows the acceleration of a proton beam up to an energy of 2 MeV. The complete system is conceived to be transportable, allowing PIXE analysis almost anywhere. This paper covers the RF design of the compact RFQ operating at 750 MHz. We present general accelerator parameters and the current state of the RF design, which includes RFQ geometry and coupler design, thermal simulation and first particle tracking results.

Slides THPO058 [2.404 MB]

Poster THPO058 [2.192 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO058

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO060

First RF Measurements of the 325 MHz Ladder RFQ

rfq, simulation, proton, coupling

826

M. Schuett, U. Ratzinger, M. Syha
IAP, Frankfurt am Main, Germany

Funding: BMBF 05P15RFRBA
Based on the positive results of the unmodulated 325 MHz Ladder-RFQ prototype from 2013 to 2016, we developed and designed a modulated 3.3 m Ladder-RFQ*. The unmodulated prototype Ladder-RFQ features a very constant voltage along the axis. The RFQ was high power tested at the GSI test stand. It accepted 3 times the RF power level needed in operation**. That level corresponds to a Kilpatrick factor of 3.1 with a pulse length of 200 µs. The 325 MHz RFQ is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the proton linac within the FAIR project. This particular high frequency creates difficulties for a 4-ROD type RFQ, which triggered the development of a Ladder RFQ with its higher symmetry. The results of the unmodulated prototype have shown, that the Ladder-RFQ is a suitable candidate for that frequency. For the present design duty cycles are feasible up to 5%. The basic design and tendering of the RFQ has been successfully completed in 2016. Manufacturing will be completed in August 2018. We will show the the finalization of manufacturing as well as first low level RF measurements of the Ladder RFQ.
*Journal of Physics: Conf. Series 874 (2017) 012048
**Proceedings of LINAC2016, East Lansing, TUPLR053

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO060

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO066

First High Power Test of the ESS High Beta Elliptical Cavity

cavity, SRF, accelerating-gradient, flattop

841

H. Li, L. Hermansson, M. Jobs, R.J.M.Y. Ruber, R. Santiago Kern
Uppsala University, Uppsala, Sweden
G. Devanz, T. Hamelin
CEA/DSM/IRFU, France

ESS, the European Spallation Source, will adopt elliptical multi-cell superconducting cavities with a beta value of 0.86 to accelerate the proton beam up to 2 GeV at the last section of the linac. A 5-cell high-beta cavity for ESS project was tested with high power at FREIA Laboratory. A pulse mode test stand based on a self-excited loop was used in this test. The qualification of the cavity package involved a 5-cell elliptical cavity, a fundamental power coupler, a cold tuning system, LLRF system and a RF station. These tests represented an important verification before the series production. This paper presents the test configuration, RF conditioning history, first high power performance and experience of this cavity package.

Slides THPO066 [1.437 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO066

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paper received ※ 14 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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THPO068

AN Effect of Field Emission on Low Beta Superconducting Cavities

pick-up, cavity, SRF, simulation

849

X. Liu, Z. Gao, Y. He, G. Huang
IMP/CAS, Lanzhou, People’s Republic of China

Superconducting RF (SRF) technology is widely ap-plied in particle accelerators to shorten the accelerator length and lower the construction price due to its high acceleration gradients with low rf losses. Field emission is the chief limitation associated with the surface electric field which will finally determine the cavity performance during the operation. The pickup-drop signal caused by field emission seriously affect the stable operation of the superconducting linac in the Chinese initiative Accelera-tor-Driven Sub-critical System (CiADS) demon facility. Simulations of the field emission effect and experimental measurements of the pickup-drop signal have been per-formed on the half wavelength resonator (HWR) cavity. And a modified design of the pickup antenna will be discussed to solve the pickup-drop problem.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO068

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paper received ※ 12 September 2018 paper accepted ※ 09 October 2018 issue date ※ 18 January 2019

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THPO069

The Electromagnetic Optimization of TE-sample Host Cavity at IMP

cavity, SRF, niobium, electron

852

S.C. Huang, Y. He, T. Tan, S.X. Zhang
IMP/CAS, Lanzhou, People’s Republic of China

As a part of the research and development work of thin-film materials for superconducting radio frequency(SRF) application in future accelerators at IMP, a 3.9GHz TE sample host cavity is being developed for the purpose of characterizing the RF Property and the loss mechanism of thin-film materials, which operates in the TE011 mode and accommodates disk sample with 110mm diameter, theoretically, the maximum magnetic field on sample surface will go up to 100mT, the resolution of surface resistance on sample will below nOhm by using thermometry technique( T-Mapping). In this paper, the electromagnetic optimization result of TE-sample host cavity will be presented, and the design consideration of hook tip style coupler and T-mapping system are also discussed.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO069

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paper received ※ 12 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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THPO072

Cryogenic Tests of the Superconducting β=0.069 CH-cavities for the HELIAC-project

cavity, heavy-ion, cryogenics, accelerating-gradient

855

M. Basten, M. Busch, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany
K. Aulenbacher, W.A. Barth, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu
HIM, Mainz, Germany
W.A. Barth, M. Heilmann, S. Yaramyshev
GSI, Darmstadt, Germany

In the future the existing UNILAC (UNIversal Linear Accelerator) at GSI will be most exclusively used as an injector for FAIR to provide short pulse high intensity heavy ion beams at low repetition rates [Barth3]. A new superconducting (sc) continuous wave (cw) high intensity heavy ion Linac should provide ion beams with max. duty factor above the coulomb barrier for the Super Heavy Element (SHE) program at GSI. The fundamental Linac design comprises a low energy beam transport (LEBT)-section followed by a sc Drift Tube Linac (DTL) consisting of sc Crossbar-H-mode (CH) structures for acceleration up to 7.3 MeV/u [*]. After the successful test and commissioning of the first demonstrator section with heavy ion beam from the HLI in 2017 [**], the next two sc CH-structures have been constructed and the first one has been extensively tested at cryogenic temperatures at the Institute for Applied Physics (IAP) at Goethe University Frankfurt (GUF). The results of the final cold test of the first CH-structure as well as the next steps realizing a new sc cw heavy ion LINAC at GSI will be presented.
[*]W. Barth et al., "Further investigations for a superconducting cw-Linac at GSI"
[**]W. Barth et al., "First high intensity heavy ion beam tests with a superconducting multi gap CH-cavity"

Poster THPO072 [1.150 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO072

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paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO073

RF Commissioning of the Superconducting 217 MHz CH Cavity for Heavy Ions and First Beam Operation

cavity, heavy-ion, SRF, MMI

859

F.D. Dziuba, K. Aulenbacher, W.A. Barth, V. Gettmann, T. Kürzeder, M. Miski-Oglu
HIM, Mainz, Germany
K. Aulenbacher
IKP, Mainz, Germany
W.A. Barth, M. Heilmann, J. Salvatore, A. Schnase, S. Yaramyshev
GSI, Darmstadt, Germany
M. Basten, M. Busch, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany

Future research programs at GSI in the field super heavy element (SHE) synthesis require high intense heavy ion beams above the coulomb barrier and high average particle currents. The upcoming demands exceed the technical opportunities of the existing UNIversal Linear ACcelerator (UNILAC). Consequently, a new dedicated superconducting (sc) continuous wave (cw) linac is crucial to keep the SHE research program at GSI competitive on a high level. Recently the first linac section, serving as a prototype to demonstrate the reliable operability of 217 MHz multi gap crossbar-H-mode (CH) cavities under a realistic accelerator environment, has been extensively tested with a heavy ion beam delivered from the GSI High Charge State Injector (HLI). Fulfilling its role as a key component of the whole demonstrator setup. The first sc 217 MHz CH cavity (CH⁰) successfully accelerated heavy ions up to the design beam energy and even beyond at high beam intensities and full transmission. In this contribution the rf commissioning and the first beam operation of the cavity is presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO073

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO084

BPM Time of Flight Measurements for Setting-up the RF Cavities of the CERN Linac4

cavity, DTL, simulation, electron

879

M. Bozzolan
CERN, Geneva, Switzerland

The newly constructed H⁻ LINAC4 at CERN has recently completed its first extended reliability run. It is equipped with Beam Position Monitors (BPMs) based on shorted-stripline pick-up electrodes to measure both position and Time of Flight (ToF). The ToF, in turn used to calculate the kinetic energy of the beam, is determined through signal phase shift measurements between pairs of BPMs. ToF measurements are performed by scanning of the phase of the RF injected into the cavities to find the nominal RF settings for optimal beam acceleration. This paper focuses on the technical aspects of the ToF measurement as well as on the results obtained during beam commissioning and their comparison with beam dynamics simulations.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO084

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paper received ※ 12 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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THPO095

Present Status of Capacitor-charging Power Supplies for Klystron Modulators in SuperKEKB Injector Linac

klystron, status, power-supply, controls

898

M. Kawamura, M. Akemoto, S. Fukuda, H. Honma, S. Michizono, H. Nakajima, T. Natsui, T. Shidara
KEK, Ibaraki, Japan
H. Akikawa, O. Endo, K. Sato
Nihon Koshuha Co. Ltd, Yokohama, Japan

The capacitor-charging power supplies (CCPSs) for the klystron modulators have been developed from 2002 in the SuperKEKB injector linac. The specifications are that the output voltage is 43kV, the charging power is 30kJ/s, and the output voltage stability is 0.2%p-p. Being used in the old facility, their sizes are restricted in 480mm x 680 mm x 760mm. After various modifications, the 13 CCPSs in the linac have been operated with no fault since last October. The present status of the CCPSs, including the outlines, specifications, and the modifications against the faults, are described.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO095

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO096

Design Study of a High Efficiency Klystron for SuperKEKB Linac

klystron, cavity, gun, simulation

901

F. Qiu, S. Fukuda, S. Matsumoto, T. Matsumoto, T. Miura, T. Natsui
KEK, Ibaraki, Japan

The injector linear accelerator (linac) for the SuperKEKB particle accelerator requires a higher efficiency klystron than the currently used 50 MW, S-band, pulsed unit (PV3050/E3730), which operates at the same voltage, to increase the power redundancy. The efficiency is expected to improve from the currently observed 45% to more than 60%. We propose a type of high efficiency klystron using novel bunching mechanisms. The 1-D disk model based code is used for preliminary optimization of the tube parameters; these parameters are further checked by 2-D codes known as field charge interaction (FCI) and MAGIC. In this paper, the design consideration of the high efficiency klystron is presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO096

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO107

High Power Coupler R&D for Superconducting CH-cavities

cavity, simulation, Windows, heavy-ion

920

J. List, K. Aulenbacher, W.A. Barth, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu
HIM, Mainz, Germany
K. Aulenbacher
IKP, Mainz, Germany
W.A. Barth, M. Heilmann, J. Salvatore, A. Schnase, S. Yaramyshev
GSI, Darmstadt, Germany
M. Basten, M. Busch, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany

The upcoming demands of the future research programs at GSI exceed the technical opportunities of the existing UNIversal Linear ACcelerator (UNILAC). Besides, the machine will be exclusively used as an injector for FAIR (Facility for Antiproton and Ion Research) providing high power heavy ion beams at a low repetition rate for injection into the synchrotron. A new dedicated superconducting (sc) continuous wave (cw) Linac is crucial to keep the research program competitive. The first part of the cw-linac, comprising a 217 MHz multi gap Crossbar-H-mode (CH) cavity surrounded by two sc solenoids inside a cryostat, already served as a prototype demonstrating reliable operability in a realistic accelerator environment. A sufficient high power RF-coupling concept is needed to feed this newly developed cw-RF cavity with up to 5 kW of RF-power. A high power coupler test stand was recently built to provide for a testing environment; further upgrade measures of this test area are foreseen. This contribution deals with the recent coupler R&D for the demonstrator set up. Besides simulations of thermal losses at the coupler (inside the RF-cavity) will be shown as well.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO107

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paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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THPO108

Development of an High Gradient Side Coupled Cavity for PROBE

cavity, proton, coupling, target

924

S. Pitman, R. Apsimon, G. Burt
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
N. Catalán Lasheras, A. Grudiev, W. Wuensch
CERN, Geneva, Switzerland
H.L. Owen
UMAN, Manchester, United Kingdom

The PROBE project aims to develop a high gradient proton accelerator for protons with energy around 250-350 MeV for proton radiography. Detailed studies have shown that the optimum design is a side coupled cavity at S-band. With an aperture of 8 mm a gradient of 54 MV/m can be obtained with 13 MW of RF power in a 30 cm structure. A prototype cavity has been machined by VDL and diffusion bonded by Bodycote. We present initial measurements of the prototype.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO108

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paper received ※ 17 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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THPO111

The Test of RF Breakdowns of CPHS RFQ

rfq, pick-up, simulation, proton

931

W.B. Ye, C. Cheng, X. Guan, J. Shi, X.W. Wang, Q.Z. Xing, S.X. Zheng
TUB, Beijing, People’s Republic of China
M.C. Wang
NINT, Shannxi, People’s Republic of China

The high accelerating gradient is significant for a compact linear accelerator, and RF breakdowns is a limitation for the high gradient. This work aims to research RF breakdowns of a 325MHz proton Radio Frequency Quadrupole (RFQ) accelerator of the Compact Pulsed Hadron Source（CPHS）. The breakdown rate (BDR) of the RFQ has been measured. Breakdown waveforms have been recorded, which have been used for counting breakdown time distribution and analyzing the location of RF breakdowns.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO111

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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THPO113

Design of 4 Ampere S-Band Linac Using Slotted Iris Structure for Hom Damping

HOM, damping, target, simulation

934

J. Pang, S. Chen, X. He
CAEP/IFP, Mainyang, Sichuan, People’s Republic of China
S. Pei, H. Shi, J.R. Zhang
IHEP, Beijing, People’s Republic of China

An S-band LINAC with the operating frequency of 2856 MHz and beam current of 4 A was designed for flash X-ray radiography for hydrodynamic test. The optimization of the parameters of the LINAC was processed to obtain the minimum beam radius and the maximum energy efficiency. For the purpose of reducing the beam orbits offset at the exit of LINAC, a slotted iris accelerating structure would be employed to suppress the transverse Higher Order Modes (HOMs) by cutting four radial slots in the iris to couple the HOMs to SiC loads. In this paper, we present the design of the LINAC and the results of beam dynamic analysis.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO113

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paper received ※ 10 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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THPO115

Consolidation and Extension of the High-gradient LINAC RF Technology at PSI

FEL, accelerating-gradient, cavity, polarization

937

P. Craievich, M. Bopp, H.-H. Braun, A. Citterio, H. Fitze, T. Garvey, T. Kleeb, F. Löhl, F. Marcellini, M. Pedrozzi, J.-Y. Raguin, L. Rivkin, K. Rolli, R. Zennaro
PSI, Villigen PSI, Switzerland

For SwissFEL a novel production process for high-gradient, high-precision C-band accelerating structures had been developed at PSI and was implemented for series production in collaboration with industry. The copper parts of the structures are machined and brazed relying on a ultra-high precision manufacturing process and tight mechanical tolerances; no RF tuning methods are applied during or after production. So far none of the structures of the series production failed during RF power conditioning and operation in the SwissFEL facility. After completing the series production for SwissFEL PSI started collaborations with CERN, ELETTRA and DESY for applying the production process and related know-how to other frequencies, namely S-band (3 GHz) and X-band (12 GHz). This paper gives an overview on the ongoing and planned R\&D activities and results obtained so far.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO115

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paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019

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FR1A05

Development of Pulsed Gas Strippers for Intense Beams of Heavy and Intermediate Mass Ions

target, operation, heavy-ion, injection

982

P. Gerhard, W.A. Barth, M. Bevcic, Ch.E. Düllmann, L. Groening, K.P. Horn, E. Jäger, J. Khuyagbaatar, J. Krier, M.T. Maier, P. Scharrer, A. Yakushev
GSI, Darmstadt, Germany
W.A. Barth, Ch.E. Düllmann, J. Khuyagbaatar
HIM, Mainz, Germany
Ch.E. Düllmann
Johannes Gutenberg University Mainz, Institut of Nuclear Chemistry, Mainz, Germany

The GSI UNILAC together with SIS18 will serve as injector for the future FAIR. A modified 1.4~MeV/u gas stripper setup has been developed, aiming at an increased yield into the particular desired charge state. The setup delivers short pulses of high gas density in synchronization with the beam pulse. This provides a higher gas density. Different gases as stripping targets were tested. Measurements with various isotopes and gas densities were conducted to investigate the stripping properties. High intensity beams of ²³⁸U⁴⁺ were successfully stripped using hydrogen as stripping gas. The stripping efficiency was significantly increased while the beam quality remained suitable. The new stripper setup and major results achieved during the development are presented. Problems with the fast valves arose while they were used for a longer duration. Another revision of the setup took place to exchange the valves. In parallel, the installation of the required infrastructure for regular operation of the gas stripper using hydrogen was planned.

Slides FR1A05 [10.013 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-FR1A05

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paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019

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FR2A02

Commissioning of the European XFEL

FEL, MMI, operation, photon

994

D. Nölle
DESY, Hamburg, Germany

The construction of the European XFEL has been finished at the end of 2016 and commissioning has been started. Meanwhile the entire facility, driving 3 free-electron-lasers in the hard and soft X-ray regime, is in operation. This contribution will report on commissioning and transition to operation, as well as on the first user runs.

Slides FR2A02 [11.022 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-FR2A02

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paper received ※ 04 September 2018 paper accepted ※ 17 October 2018 issue date ※ 18 January 2019

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