LINAC2018 - List of Keywords (proton)

Paper	Title	Other Keywords	Page
MOPO077	Design of the High Gradient Negative Harmonic Structure for Compact Ion Therapy Linac	linac, 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, linac, 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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MOPO081	Light Proton Therapy Linac LLRF System Development	LLRF, controls, cavity, interface	171
	B.B. Baricevic, A. Bardorfer, R. Cerne I-Tech, Solkan, Slovenia G. De Michele, Ye. Ivanisenko AVO-ADAM, Meyrin, Switzerland
	Proton cancer therapy is a state-of-the-art medical treatment technique based on an accelerator beam production facility. The LIGHT linear accelerator design by AVO-ADAM offers a modular compact solution for precise control of the treatment dose delivery, both position and energy wise. Proton energy can be modulated at up to 200 Hz in a range from 70 to 230 MeV by varying the gradient of the accelerating structures. The normal conducting LINAC RF system is based on a 750 MHz RFQ and 12 S band stations individually controlled. A customized LLRF system is being developed on the Libera LLRF platform for the LIGHT project. The paper is describing the required cavity field control functionality and the other subsystems such as master oscillator reference, cavity tuning, real-time control, data acquisition, control system and synchronization interfaces.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO081
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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MOPO095	A Risk Based Approach to Improving Beam Availability at an Accelerator Facility	operation, experiment, GUI, factory	207
	W.C. Barkley, M.J. Borden, R.W. Garnett, M.S. Gulley, E.L. Kerstiens, M. Pieck, D. Rees, F.E. Shelley, B.G. Smith LANL, Los Alamos, New Mexico, USA
	Funding: United States Department of Energy This paper describes a risk-based approach to improving beam availability at an accelerator facility. Los Alamos Neutron Science Center (LANSCE), like many other accelerator facilities, was built many years ago and has been re-purposed when new missions were adopted. Many of the upgrades to the accelerator and beamlines allowed improvements in the general area of the upgrade but large-scale, system-wide improvements were never accomplished. Because of this, the facility operates with a mix of old and new equipment of varying condition. Limited budgets have constrained spending for spares procurement making it vital to prioritize those items predicted to have the highest impact to availability, should they fail. A systematic approach is described where equipment is inventoried, condition assessed, rated for potential failure and finally compiled into a risk-based priority list.
	Poster MOPO095 [0.332 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO095
About •	paper received ※ 21 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019
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MOPO100	Doubly Stripped Proton Causing Vacuum Leak at Brookhaven 200 MeV H⁻ linac Complex	linac, 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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MOPO120	Improvement of the Linear Part in the Tuner System of ADS 25 MeV Linac	linac, experiment, 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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MOPO132	The 7 MeV APF DTL for Proton Therapy	DTL, simulation, rfq, injection	277
	X.C. Xie, D.M. Li, X. Li, Y.H. Pu, J. Qiao, M.H. Zhao, Z.T. Zhao SINAP, Shanghai, People’s Republic of China Y.H. Pu, X.C. Xie, F. Yang Shanghai APACTRON Particle Equipment Company Limited, Shanghai, People’s Republic of China
	Funding: This work is fund by Ministry of Science and Technology of the People’s Repulic of China, under Grant Number 2016YFC0105408 A 7MeV alternating phase focused (APF) drift tube linear (DTL) for proton therapy has been designed, and a design code has been developed based on a sinusoidal synchronous phase formula and a linearly increasing electrode voltage assumption. The design procedure includes the radio frequency quadrupole (RFQ) to drift tube linac (DTL) matching, and end-to-end simulation that conducted by Trace Win. Moreover, a cutting method has been performed to correct the integral electric field deviation of RF gaps.
	Slides MOPO132 [4.219 MB]
	Poster MOPO132 [2.604 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO132
About •	paper received ※ 20 August 2018 paper accepted ※ 15 January 2019 issue date ※ 18 January 2019
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TUPO013	Commissioning Status of the LIGHT Development Machine	MMI, rfq, DTL, linac	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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TUPO109	Electron Cloud Estimates for the Jefferson Lab EIC	electron, sextupole, simulation, dipole	563
	K.E. Deitrick, V.S. Morozov, T. Satogata JLab, Newport News, Virginia, USA
	Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. In this work, we present preliminary estimates for electron cloud build-up and saturation for the ion ring of the Jefferson Laboratory Electron-Ion Collider (JLEIC) currently under development. Using the baseline ion ring design, we study the impact of various operational parameters on the behavior of the electron cloud for a 100 GeV proton beam, including estimated tune shifts.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO109
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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WE2A04	Commissioning of New SARAF RFQ and Design of New Linac	rfq, linac, 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]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-WE2A04
About •	paper received ※ 17 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TH1A04	The Proton Driven Advanced Wake Field Acceleration Experiment (AWAKE) at CERN	plasma, electron, wakefield, acceleration	642
	S. Döbert CERN, Geneva, Switzerland
	The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wake field generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment at CERN and the world’s first proton driven plasma wake field acceleration experiment. The experiment uses the 400 GeV proton beam from the SPS which travels through a 10 m long Rb-vapour plasma cell where it gets self-modulated and generates the plasma wake fields. Eventually an electron beam is injected externally to probe the wake-fields. AWAKE will has completed several experimental campaigns starting in 2016. Results from the initial characterization of the plasma cell and measurements of the seeded self-modulation of the proton beam will be presented. Experiments to accelerate externally injected electrons using the proton driven plasma wake fields will start in 2018 and first results will be reported.
	Slides TH1A04 [4.787 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1A04
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TH1P01	Commissioning of CERN LINAC4	linac, MMI, injection, 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]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1P01
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TH1P03	New Trends in Proton and Carbon Therapy Linacs	linac, cavity, DTL, rfq	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]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1P03
About •	paper received ※ 11 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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THPO022	Development Progress of the H⁺/H⁻ Linear Accelerators at Tsinghua University	linac, DTL, neutron, 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]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO022
About •	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, simulation, linac, 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]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO035
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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THPO042	An Optimization Method of the Nose-cone Buncher Cavity	cavity, simulation, radiation, bunching	778
	W.L. Liu, P.T. Cong, Z.M. Wang NINT, Shannxi, People’s Republic of China H. Jiang, S.X. Zheng TUB, Beijing, People’s Republic of China
	The nose-cone buncher cavity is widely used on proton accelerators. It’s important to properly optimize the cavity geometry for fine RF performance. Howev-er, currently the optimization is usually carried out manually and the criteria are not objective enough. In this paper, an optimization method using the multi-objective, multi-variable optimization approach is presented. The geometry and RF parameters are con-sidered as the variables and objectives respectively. The goal function is defined as the weighted sum of multiple RF parameters. The multi-variable functions are approximately derived from the single-variable functions based on electromagnetic simulation. And an optimization code is developed accordingly which has been applied to the XiPAF debuncher optimization.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO042
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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THPO043	ESS Normal Conducting Linac Status and Plans	rfq, ion-source, DTL, linac	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
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO043
About •	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	linac, 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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO046
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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THPO058	RF Design of a High-frequency RFQ Linac for PIXE Analysis	rfq, simulation, linac, cavity	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]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO058
About •	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, linac, simulation, 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
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO060
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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THPO061	Beam Characterization of the MYRRHA-RFQ	rfq, diagnostics, simulation, injection	830
	P.P. Schneider, M. Droba, O. Meusel, H. Podlech, A. Schempp IAP, Frankfurt am Main, Germany D. Noll CERN, Geneva, Switzerland
	Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) #05P15RFRBA and HORIZON 2020 for the MYRRHA project #662186 and HIC for FAIR. The Linear Accelerator for the MYRRHA project* is under construction. In a first step the linac up to 100 MeV will be realized. The LEBT section has been set into operation in Belgium and the RFQ is installed in summer 2018. A system to analyze the ion beam consisting of a slit-grid emittance scanner, a beam dump and a momentum spectrometer, called diagnostic train descripted in *, will be set on the rails to characterize the beam at the RFQ injection point. The results will be used to adjust the optimal matching for the RFQ. After the measurements downstream the LEBT, the diagnostic train begins its journey along the beam line and at the first station the RFQ is installed. The accelerated beam of the RFQ is then analyzed and optimized. In addition to optimization of transmission the artificial production of beam offsets in the LEBT is of special interest. These will be measured at the injection point to estimate the range of possible offsets. In the following measurements these offsets will be used to study the influence of the offsets on the RFQ performance. Furthermore, the RFQ parameters are varied to see their influence on the beam transport, transmission and beam quality. H.Aı̈t Abderrahim et al. "MYRRHA: A multipurpose accelerator driven system for research & development", 2001 ** 1st Experiments at the CW-Operated RFQ for Intense Proton Beams, LINAC16
	Poster THPO061 [4.610 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO061
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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THPO062	IFMIF/EVEDA RFQ Preliminary Beam Characterization	rfq, MMI, simulation, operation	834
	E. Fagotti, L. Antoniazzi, L. Bellan, M. Comunian, F. Grespan, M. Montis, A. Palmieri, A. Pisent, F. Scantamburlo INFN/LNL, Legnaro (PD), Italy T. Akagi, K. Kondo, K. Sakamoto, T. Shinya, M. Sugimoto QST, Aomori, Japan P. Cara IFMIF/EVEDA, Rokkasho, Japan H. Dzitko, I.M. Moya F4E, Germany R. Heidinger, A. Marqueta Fusion for Energy, Garching, Germany I. Podadera CIEMAT, Madrid, Spain
	The IFMIF/EVEDA RFQ is the longest and powerful operated. Therefore, it requires a careful characterization from several aspects: beam dynamics, RF, mechanics, installation and commissioning. Due to the very large power handling, the preliminary beam operation was decided to be performed with a low proton beam current at one half of the voltage needed for deuteron accelera-tion, i.e. from 8 mA to 30 mA at 2.5 MeV in pulsed mode, with respect to the nominal 130-mA deuteron beam at 5 MeV in CW. In this framework, it will be presented the characterization of the RFQ in terms of simulation and measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO062
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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THPO086	Beam Loss and Average Beam Current Measurements Using a CWCT	instrumentation, electronics, electron, diagnostics	882
	F. Stulle, H. Bayle, J.F. Bergoz, T. Delaviere, L. Dupuy BERGOZ Instrumentation, Saint Genis Pouilly, France P. Forck, M. Witthaus GSI, Darmstadt, Germany D. Vandeplassche SCK•CEN, Mol, Belgium J.X. Wu IMP/CAS, Lanzhou, People’s Republic of China
	The CWCT is a novel instrument adapted to an accurate average current determination of bunched CW beams or macro pulses. By combining a high-droop current transformer with novel electronics for signal analysis, an output signal bandwidth of DC to about 500kHz and a current resolution down to the micro-ampere level are achieved. Beam current fluctuations are followed within microseconds, permitting fast detection of beam loss. These characteristics render the CWCT an ideal instrument for HPPAs, for example ADS linacs, and other proton or ion accelerators. We present the CWCT principle and the CWCT performance achieved in beam experiments at UNILAC, GSI.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO086
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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THPO108	Development of an High Gradient Side Coupled Cavity for PROBE	cavity, linac, 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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO108
About •	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, linac, simulation	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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO111
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

MOPO077

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

linac, 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

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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, linac, 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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MOPO081

Light Proton Therapy Linac LLRF System Development

LLRF, controls, cavity, interface

171

B.B. Baricevic, A. Bardorfer, R. Cerne
I-Tech, Solkan, Slovenia
G. De Michele, Ye. Ivanisenko
AVO-ADAM, Meyrin, Switzerland

Proton cancer therapy is a state-of-the-art medical treatment technique based on an accelerator beam production facility. The LIGHT linear accelerator design by AVO-ADAM offers a modular compact solution for precise control of the treatment dose delivery, both position and energy wise. Proton energy can be modulated at up to 200 Hz in a range from 70 to 230 MeV by varying the gradient of the accelerating structures. The normal conducting LINAC RF system is based on a 750 MHz RFQ and 12 S band stations individually controlled. A customized LLRF system is being developed on the Libera LLRF platform for the LIGHT project. The paper is describing the required cavity field control functionality and the other subsystems such as master oscillator reference, cavity tuning, real-time control, data acquisition, control system and synchronization interfaces.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO081

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

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MOPO095

A Risk Based Approach to Improving Beam Availability at an Accelerator Facility

operation, experiment, GUI, factory

207

W.C. Barkley, M.J. Borden, R.W. Garnett, M.S. Gulley, E.L. Kerstiens, M. Pieck, D. Rees, F.E. Shelley, B.G. Smith
LANL, Los Alamos, New Mexico, USA

Funding: United States Department of Energy
This paper describes a risk-based approach to improving beam availability at an accelerator facility. Los Alamos Neutron Science Center (LANSCE), like many other accelerator facilities, was built many years ago and has been re-purposed when new missions were adopted. Many of the upgrades to the accelerator and beamlines allowed improvements in the general area of the upgrade but large-scale, system-wide improvements were never accomplished. Because of this, the facility operates with a mix of old and new equipment of varying condition. Limited budgets have constrained spending for spares procurement making it vital to prioritize those items predicted to have the highest impact to availability, should they fail. A systematic approach is described where equipment is inventoried, condition assessed, rated for potential failure and finally compiled into a risk-based priority list.

Poster MOPO095 [0.332 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO095

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paper received ※ 21 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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MOPO100

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

linac, 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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MOPO120

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

linac, experiment, 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

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

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MOPO132

The 7 MeV APF DTL for Proton Therapy

DTL, simulation, rfq, injection

277

X.C. Xie, D.M. Li, X. Li, Y.H. Pu, J. Qiao, M.H. Zhao, Z.T. Zhao
SINAP, Shanghai, People’s Republic of China
Y.H. Pu, X.C. Xie, F. Yang
Shanghai APACTRON Particle Equipment Company Limited, Shanghai, People’s Republic of China

Funding: This work is fund by Ministry of Science and Technology of the People’s Repulic of China, under Grant Number 2016YFC0105408
A 7MeV alternating phase focused (APF) drift tube linear (DTL) for proton therapy has been designed, and a design code has been developed based on a sinusoidal synchronous phase formula and a linearly increasing electrode voltage assumption. The design procedure includes the radio frequency quadrupole (RFQ) to drift tube linac (DTL) matching, and end-to-end simulation that conducted by Trace Win. Moreover, a cutting method has been performed to correct the integral electric field deviation of RF gaps.

Slides MOPO132 [4.219 MB]

Poster MOPO132 [2.604 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO132

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

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TUPO013

Commissioning Status of the LIGHT Development Machine

MMI, rfq, DTL, linac

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

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

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TUPO109

Electron Cloud Estimates for the Jefferson Lab EIC

electron, sextupole, simulation, dipole

563

K.E. Deitrick, V.S. Morozov, T. Satogata
JLab, Newport News, Virginia, USA

Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
In this work, we present preliminary estimates for electron cloud build-up and saturation for the ion ring of the Jefferson Laboratory Electron-Ion Collider (JLEIC) currently under development. Using the baseline ion ring design, we study the impact of various operational parameters on the behavior of the electron cloud for a 100 GeV proton beam, including estimated tune shifts.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO109

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

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WE2A04

Commissioning of New SARAF RFQ and Design of New Linac

rfq, linac, 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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TH1A04

The Proton Driven Advanced Wake Field Acceleration Experiment (AWAKE) at CERN

plasma, electron, wakefield, acceleration

642

S. Döbert
CERN, Geneva, Switzerland

The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wake field generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment at CERN and the world’s first proton driven plasma wake field acceleration experiment. The experiment uses the 400 GeV proton beam from the SPS which travels through a 10 m long Rb-vapour plasma cell where it gets self-modulated and generates the plasma wake fields. Eventually an electron beam is injected externally to probe the wake-fields. AWAKE will has completed several experimental campaigns starting in 2016. Results from the initial characterization of the plasma cell and measurements of the seeded self-modulation of the proton beam will be presented. Experiments to accelerate externally injected electrons using the proton driven plasma wake fields will start in 2018 and first results will be reported.

Slides TH1A04 [4.787 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1A04

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

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TH1P01

Commissioning of CERN LINAC4

linac, MMI, injection, 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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TH1P03

New Trends in Proton and Carbon Therapy Linacs

linac, cavity, DTL, rfq

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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THPO022

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

linac, DTL, neutron, 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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THPO035

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

DTL, simulation, linac, 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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THPO042

An Optimization Method of the Nose-cone Buncher Cavity

cavity, simulation, radiation, bunching

778

W.L. Liu, P.T. Cong, Z.M. Wang
NINT, Shannxi, People’s Republic of China
H. Jiang, S.X. Zheng
TUB, Beijing, People’s Republic of China

The nose-cone buncher cavity is widely used on proton accelerators. It’s important to properly optimize the cavity geometry for fine RF performance. Howev-er, currently the optimization is usually carried out manually and the criteria are not objective enough. In this paper, an optimization method using the multi-objective, multi-variable optimization approach is presented. The geometry and RF parameters are con-sidered as the variables and objectives respectively. The goal function is defined as the weighted sum of multiple RF parameters. The multi-variable functions are approximately derived from the single-variable functions based on electromagnetic simulation. And an optimization code is developed accordingly which has been applied to the XiPAF debuncher optimization.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO042

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

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THPO043

ESS Normal Conducting Linac Status and Plans

rfq, ion-source, DTL, linac

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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THPO046

Status of the FAIR Proton Linac

linac, 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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THPO058

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

rfq, simulation, linac, cavity

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, linac, simulation, 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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THPO061

Beam Characterization of the MYRRHA-RFQ

rfq, diagnostics, simulation, injection

830

P.P. Schneider, M. Droba, O. Meusel, H. Podlech, A. Schempp
IAP, Frankfurt am Main, Germany
D. Noll
CERN, Geneva, Switzerland

Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) #05P15RFRBA and HORIZON 2020 for the MYRRHA project #662186 and HIC for FAIR.
The Linear Accelerator for the MYRRHA project* is under construction. In a first step the linac up to 100 MeV will be realized. The LEBT section has been set into operation in Belgium and the RFQ is installed in summer 2018. A system to analyze the ion beam consisting of a slit-grid emittance scanner, a beam dump and a momentum spectrometer, called diagnostic train descripted in **, will be set on the rails to characterize the beam at the RFQ injection point. The results will be used to adjust the optimal matching for the RFQ. After the measurements downstream the LEBT, the diagnostic train begins its journey along the beam line and at the first station the RFQ is installed. The accelerated beam of the RFQ is then analyzed and optimized. In addition to optimization of transmission the artificial production of beam offsets in the LEBT is of special interest. These will be measured at the injection point to estimate the range of possible offsets. In the following measurements these offsets will be used to study the influence of the offsets on the RFQ performance. Furthermore, the RFQ parameters are varied to see their influence on the beam transport, transmission and beam quality.
* H.Aı̈t Abderrahim et al. "MYRRHA: A multipurpose accelerator driven system for research & development", 2001
** 1st Experiments at the CW-Operated RFQ for Intense Proton Beams, LINAC16

Poster THPO061 [4.610 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO061

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

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THPO062

IFMIF/EVEDA RFQ Preliminary Beam Characterization

rfq, MMI, simulation, operation

834

E. Fagotti, L. Antoniazzi, L. Bellan, M. Comunian, F. Grespan, M. Montis, A. Palmieri, A. Pisent, F. Scantamburlo
INFN/LNL, Legnaro (PD), Italy
T. Akagi, K. Kondo, K. Sakamoto, T. Shinya, M. Sugimoto
QST, Aomori, Japan
P. Cara
IFMIF/EVEDA, Rokkasho, Japan
H. Dzitko, I.M. Moya
F4E, Germany
R. Heidinger, A. Marqueta
Fusion for Energy, Garching, Germany
I. Podadera
CIEMAT, Madrid, Spain

The IFMIF/EVEDA RFQ is the longest and powerful operated. Therefore, it requires a careful characterization from several aspects: beam dynamics, RF, mechanics, installation and commissioning. Due to the very large power handling, the preliminary beam operation was decided to be performed with a low proton beam current at one half of the voltage needed for deuteron accelera-tion, i.e. from 8 mA to 30 mA at 2.5 MeV in pulsed mode, with respect to the nominal 130-mA deuteron beam at 5 MeV in CW. In this framework, it will be presented the characterization of the RFQ in terms of simulation and measurements.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO062

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

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THPO086

Beam Loss and Average Beam Current Measurements Using a CWCT

instrumentation, electronics, electron, diagnostics

882

F. Stulle, H. Bayle, J.F. Bergoz, T. Delaviere, L. Dupuy
BERGOZ Instrumentation, Saint Genis Pouilly, France
P. Forck, M. Witthaus
GSI, Darmstadt, Germany
D. Vandeplassche
SCK•CEN, Mol, Belgium
J.X. Wu
IMP/CAS, Lanzhou, People’s Republic of China

The CWCT is a novel instrument adapted to an accurate average current determination of bunched CW beams or macro pulses. By combining a high-droop current transformer with novel electronics for signal analysis, an output signal bandwidth of DC to about 500kHz and a current resolution down to the micro-ampere level are achieved. Beam current fluctuations are followed within microseconds, permitting fast detection of beam loss. These characteristics render the CWCT an ideal instrument for HPPAs, for example ADS linacs, and other proton or ion accelerators. We present the CWCT principle and the CWCT performance achieved in beam experiments at UNILAC, GSI.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO086

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

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THPO108

Development of an High Gradient Side Coupled Cavity for PROBE

cavity, linac, 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, linac, simulation

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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