IPAC2018 - List of Keywords (rfq)

Paper	Title	Other Keywords	Page
MOZGBF1	FRIB Front End Construction and Commissioning	MMI, ECR, operation, ion-source	58
	G. Pozdeyev FRIB, East Lansing, Michigan, USA
	The Facility for Rare Isotope Beams (FRIB) is based upon the CW, SC driver linac to accelerate all the stable isotopes up to more than 200 MeV/u with a beam power of 400 kW. The front end (FE) commissioning shall start in 2017. This invited talk presents the FRIB front end design, and current status of FRIB front end commissioning, including beam properties and energy, and their relationship to FRIB operational requirements.
	Slides MOZGBF1 [2.965 MB]
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MOPML014	Status of the Commissioning of the LIGHT Prototype	DTL, MMI, linac, proton	425
	A. Degiovanni, J. Adam, D. Aguilera Murciano, S. Ballestrero, A. Benot-Morell, R. Bonomi, F.C.M. Cabaleiro Magallanes, M. Caldara, G. D'Auria, G. De Michele, M. Esposito, S. Fanella, D. Fazio, D.A. Fink, Y. Fusco, M. Gonzalez, P. Gradassi, A. Jeff, 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. Cerv, V.A. Dimov, L.S. Esposito, S. H. Gibson, M. Giunta, Ye. Ivanisenko, V. F. Khan, S. Magnoni, C. Mellace, J.L. Navarro Quirante, H. Pavetits, PPA. Paz Neira, P. Stabile, K. Stachyra, D. Ungaro, A. Valloni, C. Zannini AVO-ADAM, Meyrin, Switzerland
	The company A.D.A.M. (Application of Detectors and Accelerators to Medicine), a CERN spin-off, is working on the construction and testing of its first linear accelerator for medical application: LIGHT (Linac for Image-Guided Hadron Therapy). LIGHT is an innovative high frequency proton linac designed to accelerate proton beams up to 230 MeV for protontherapy applications. The LIGHT accelerator consists of three different linac sections: 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 Cell Coupled 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. A prototype of LIGHT is presently under commissioning at CERN. This paper describes the design aspects and the different stages of installation and commissioning of the LIGHT prototype with emphasis on beam tests results obtained during the past year at different energies.
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MOPML017	Status and Development of the MYRRHA Injector	cavity, diagnostics, linac, MMI	432
	D. Mäder, H. Höltermann, D. Koser, B. Koubek, K. Kümpel, P. Müller, U. Ratzinger, M. Schwarz, W. Schweizer BEVATECH, Frankfurt, Germany C. Angulo, J. Belmans, D. Davin, W. De Cock, P. Della Faille, F. Doucet, A. Gatera, Pompon, F.F. Pompon, D. Vandeplassche Studiecentrum voor Kernenergie - Centre d'Étude de l'énergie Nucléaire (SCK•CEN), Mol, Belgium M. Busch, H. Hähnel, H. Podlech IAP, Frankfurt am Main, Germany
	The MYRRHA project aims at coupling a cw 600 MeV, 4 mA proton linac with a sub-critical reactor as the very first prototype nuclear reactor to be driven by a particle accelerator (ADS). Among several applications, MYRRHA main objective is to demonstrate the principle of partitioning and transmutation (P&T) as a viable solution to drastically reduce the radiotoxicity of long-life nuclear waste. For this purpose, the linac needs an unprecedented level of reliability in terms of allowable beam trips. The normal conducting injector delivers 16.6 MeV protons to the superconducting main linac. The first section of the injector (up to 5.9 MeV) consists of an ECR source, a 4-Rod-RFQ and a rebunching line followed by 7 individual CH-type cavities. This entire section will be set up and operated by SCK·CEN in Louvain-la-Neuve, Belgium, for ample performance and reliability testing. The first CH cavity has been sent for power tests to IAP Frankfurt, Germany. The most recent status of all cavities, couplers and the beam diagnostics of the MYRRHA injector is presented in this paper.
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MOPML027	Status of Carbon Commissioning of the MedAustron Therapy Accelerator	MMI, synchrotron, linac, ion-source	457
	C. Schmitzer, L. Adler, A. De Franco, F. Farinon, N. Gambino, G. Guidoboni, M. Kronberger, C. Kurfürst, S. Myalski, S. Nowak, M.T.F. Pivi, I. Strašík, A. Wastl EBG MedAustron, Wr. Neustadt, Austria L.C. Penescu Abstract Landscapes, Montpellier, France
	The MedAustron therapy accelerator is intended to treat cancer patients with proton and carbon beams of 62-252 MeV and 120-400 MeV respectively. The accelerator features three Supernanogan ECR ion sources, a 400 keV/u RFQ and a 7 MeV/u interdigital H-mode Linac. A middle energy beam transfer line also serves as injector into a 77m synchrotron from which the beam may be transferred to 4 different irradiation rooms, 3 of which are dedicated to medical treatment. The therapy accelerator is in clinical operation since end 2016 and is currently solely configured for the use of protons. The next clinical objective is to enable treatments using C⁶⁺ ions which triggered the carbon commissioning of the accelerator in 2017. This paper will discuss the latest results from carbon commissioning in the different sections of the accelerator, achieved efficiencies and outlook on future carbon activities.
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TUPAF002	Beam Commissioning of the 750 MHz Proton RFQ for the LIGHT Prototype	MMI, linac, emittance, diagnostics	658
	V.A. Dimov, M. Caldara, A. Degiovanni, L.S. Esposito, D.A. Fink, M. Giunta, A. Jeff, A. Valloni AVO-ADAM, Meyrin, Switzerland A.M. Lombardi, S.J. Mathot, M. Vretenar CERN, Geneva, Switzerland
	ADAM (Application of Detectors and Accelerators to Medicine), a CERN spin-off company, is developing the Linac for Image Guided Hadron Therapy, LIGHT, which will accelerate proton beams up to 230 MeV. The design of the linac will allow fast intensity and energy modulation for pencil-beam scanning during cancer treatment. The linac consists of a 40 keV Proton Injector; a 750 MHz Radio Frequency Quadrupole (RFQ) accelerating the proton beam up to 5 MeV; a 3 GHz Side Coupled Drift Tube Linac (SCDTL) up to 37.5 MeV; and a 3 GHz Cell Coupled Linac (CCL) section up to 230 MeV. A prototype of LIGHT is being commissioned progressively with the installation of the accelerating structures at a CERN site. The beam commissioning of the RFQ, which was designed and built by CERN, was completed in 2017 using a movable beam diagnostic test bench with various instruments. This paper reports on the RFQ commissioning strategy and the results of the beam measurements.
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TUPAF012	Commissioning of the Lipac Medium Energy Beam Transport Line	cavity, vacuum, controls, operation	683
	I. Podadera, J. Castellanos, J.M. García, D. Gavela, A. Ibarra, D. Jiménez-Rey, A. Marqueta, L.M. Martinez Fresno, E. Molina Marinas, J. Mollá, P. Méndez, C. Oliver, D. Regidor, F. Toral, R. Varela, V. Villamayor, M. Weber, C. de la Morena CIEMAT, Madrid, Spain P. Cara, A. Marqueta, I. Moya Fusion for Energy, Garching, Germany T. Ebisawa, Y. Hirata, A. Ihara, Y. Ikeda, A. Kasugai, T. Kitano, K. Kondo, T. Narita, K. Sakamoto, T. Shinya, M. Sugimoto QST, Aomori, Japan D. Gex, A. Jokinen F4E, Germany J. Knaster IFMIF/EVEDA, Rokkasho, Japan M. Mendez Macias 7S, Peligros (Granada), Spain O. Nomen IREC, Sant Adria del Besos, Spain G. Pruneri Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova, Italy F. Scantamburlo INFN/LNL, Legnaro (PD), Italy
	Funding: This work has been funded by the Spanish Ministry of Economy and Competitiveness under the Agreement as published in BOE, 16/01/2013, page 1988 and the project FIS2013-40860-R. LIPAc* will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology to be used as neutron source of the IFMIF facility. Those facilities are essential for future fusion reactors material research. A 175 MHz RFQ will increase the energy up to 5 MeV before a Superconducting RF (SRF) linac with eight 175 MHz Half Wave Resonators brings the particles up to the final energy of 9 MeV. Between both stages, a Medium Energy Beam Transport line (MEBT)** aims at transporting and matching the beam between the RFQ and the SRF linac. The transverse focusing of the beam is controlled by five quadrupole magnets with integrated steerers, grouped in one triplet and one doublet. Two buncher cavities handle the longitudinal dynamics. Two movable scraper systems are included to purify the beam optics coming out the RFQ and avoid losses in the SRF linac. In this contribution, checkout of the beamline and its ancillaries in Japan is reported. Tests carried out on the beamline prior to the MEBT beam commissioning are described, focusing in vacuum tests, magnets powering, buncher conditioning and scrapers movement. * P. Cara et al., IPAC16, MOPOY057 , p.985, Busan, Korea (2016) ** I. Podadera et al., LINAC2016, TUPLR041, p.554, East Lansing, USA (2016).
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TUPAF016	Increase of IPHI Beam Power at CEA Saclay	neutron, proton, detector, target	694
	F. Senée, F. Benedetti, E. Giner-Demange, A. Gomes, M. Oublaid CEA/DRF/IRFU, Gif-sur-Yvette, France P. Ausset, M. Ben Abdillah, C. Joly IPN, Orsay, France F. Belloni, B. Bolzon, N. Chauvin, M. Desmons, Y. Gauthier, C. Marchand, J. Marroncle, T. Papaevangelou, G. Perreu, O. Piquet, B. Pottin, Y. Sauce, J. Schwindling, L. Segui, O. Tuske, D. Uriot CEA/IRFU, Gif-sur-Yvette, France F. Harrault, R. Touzery CEA/DSM/IRFU, France
	For the first time, in April 2016, the SILHI source produced a proton beam for IPHI RFQ. Due to several technical difficulties on the RFQ water cooling skid, a short RF power pulse (100 μs at the beginning until few hundred microseconds) is injected into the RFQ accelerates the high intensity proton beam up to 3 MeV. The repetition rate is tuned between 1 and 5 Hz. Under these conditions, the beam power after the RFQ is lower than 100 W. At the end of 2017, the 352 MHz RFQ conditioning has been completed (with the same duty cycle) and the proton beam has been accelerated. The increase of the beam power is expected to continue in 2018 in order to reach several kilowatts by the end of the year. In addition, two Ionization beam Profile Monitors (IPM) developed for ESS have been tested on the deviated beam line with a very low duty cycle. The IPHI facility should demonstrate the possibility to produce neutrons with a flexible compact accelerator in the framework of the SONATE project. This paper presents the status of the IPHI project in April 2018.
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TUPAF041	Residual Gas Ions Characterization from the REXEBIS	detector, ISOL, experiment, electron	784
	N. Bidault, M.L. Lozano, J.A. Rodriguez CERN, Geneva, Switzerland
	The Isotope mass Separator On-Line DEvice (ISOLDE) is a user facility located at CERN where Radioactive Ion Beams (RIBs) are produced from proton collisions onto a target, mass separated and transported to user experimental stations either directly at low energy or after being post- accelerated, notably for nuclear physics studies. Prior to acceleration through the REX/HIE-ISOLDE linear acceler- ator, the ion beam is accumulated, bunched and cooled in a Penning trap (REXTRAP) and afterwards charge-bred in an Electron Beam Ion Source (REXEBIS). Multi-charged radioactive species of interest are then selected by a mass-to- charge (A/q) ratio separator dipole in the Low Energy Beam Transfer Line (LEBT). A method is presented to character- ize the Residual Gas Ion (RGI) background contamination for diﬀerent operational conditions of the REXEBIS. More particularly, a discussion is held about the inﬂuence of the conﬁnement time inside the charge-breeder on the residual gas spectrum. Finally, a method to identify sub-pico-Ampere contaminants is demonstrated.
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TUPAF064	Preparation Towards the Ess Linac Ion Source and Lebt Beam Commissioning on Ess Site	MMI, linac, solenoid, site	874
	R. Miyamoto, M. Eshraqi, A. Jansson, E. Laface, Y. Levinsen, O. Midttun, N. Milas, M. Muñoz, D.C. Plostinar, A. Ponton, E. Sargsyan, L. Tchelidze ESS, Lund, Sweden L. Celona, L. Neri INFN/LNS, Catania, Italy W. Ledda Vitrociset s.p.a, Roma, Italy
	Beam commissioning of the proton linac of the European Spallation Source begin in summer, 2018, from the ion source (IS) and low energy beam transport (LEBT), and continues in stages until 2022, when the first beam is sent to its spallation target. This paper presents the plan, status, and highlights of preparation works for the upcoming IS and LEBT beam commissioning.
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TUPAF067	Beam Physics Analysis of the ESS RFQ Non-Conformities	alignment, emittance, ion-source, radio-frequency-quadrupole	886
	A. Ponton ESS, Lund, Sweden
	During the fabrication of an RFQ, deviation from the perfect geometry will occur during assembling, brazing and machining the different parts. These geometrical defects will also impact the theoretical inter-vane voltage, given by the beam dynamics, even if tuners can correct partially the effect of the manufacturing. The combination of geometrical and voltage errors will alter the electro-magnetic field in the axis region leading to a degradation of the beam quality. The study proposes to expand the method to treat the voltage errors presented in * , in which the deviation from the theoretical parameters is represented by a sum of periodic functions of z, to the machining errors and to include positioning and alignment errors. The results of the error study will be presented. Then, using the results of the fabrication control by metrology, we will analyze the impact of the real RFQ geometry on the beam transport and compare the results will the prediction from the error study. * A. Ponton et al., "Voltage errors studies in the ESS RFQ", presented at the 7th Int. Particle Accelerator Conf. (IPAC'16), Busan, Korea, May 2016, paper THPMB039.
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TUPAF068	Functional Integration of the RFQ in the ESS Systems	cavity, controls, LLRF, vacuum	890
	J.S. Schmidt, E. Bargalló, T. Fay, G. Hulla, B. Lagoguez, R. Montaño, E. Sargsyan, S. Scolari, H. Spoelstra ESS, Lund, Sweden A.C. Chauveau, M. Desmons, O. Piquet CEA/IRFU, Gif-sur-Yvette, France A.J. Johansson Lund University, Lund, Sweden W. Ledda Vitrociset s.p.a, Roma, Italy
	The 352 MHz Radio Frequency Quadrupole (RFQ) for the European Spallation Source ERIC (ESS) will be delivered during 2018. After delivery, installation and tuning of the cavity, the high power RF conditioning will be performed. At this point all the different systems that are needed to condition and operate the RFQ have to be in place and operational. This paper will give an overview of the system analysis that has been performed for the RFQ. The RFQ requirements for the RF system, including the RF distribution system (RFDS), the Low Level RF (LLRF) and the local RF protection system (RFLPS) will be presented. In addition, the paper covers the system integration of the structure in the ESS control and vacuum systems as well as the outcome of a machine protection analysis.
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TUPAF077	Beam Optics Measurements in Medium Energy Beam Transport at PIP-II Injector Test Facility	quadrupole, optics, beam-transport, emittance	909
	A. Saini, J.-P. Carneiro, B.M. Hanna, L.R. Prost, A.V. Shemyakin Fermilab, Batavia, Illinois, USA V.L. Sista BARC, Mumbai, India
	Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics The Proton Improvement Plan-II Injector Test (PIP2IT) is an accelerator test facility under construction at Fermilab that will provide a platform to demonstrate critical technologies and concept of the front-end of the PIP-II linear accelerator (linac). The PIP2IT warm front-end comprises a H⁻ ion source capable of delivering 15 mA, 30 keV DC or pulsed beam, a Low Energy Beam Transport (LEBT), a 162.5 MHz, CW Radio Frequency Quadrupole (RFQ) that accelerates the beam to 2.1 MeV and, a 14 m medium energy beam transport (MEBT). Presently, beamline up to the MEBT has been commissioned and operates routinely at the PIP2IT facility. In this paper, we discuss beam measurements performed at the MEBT to analyze beam emittance and its RMS sizes along the MEBT. In addition, beam based calibration of the beamline elements using differential trajectory measurement is also presented.
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TUPAF086	Adaption of the HSI -RFQ Rf-Properties to an Improved Beam Dynamics Layout	simulation, operation, linac, resonance	938
	M. Vossberg, L. Groening, S. Mickat, H. Vormann, C. Xiao GSI, Darmstadt, Germany V. Bencini, J.M. Garland, J.-B. Lallement, A.M. Lombardi CERN, Geneva, Switzerland
	The GSI accelerator facility comprising the linear accelerator UNILAC and the synchrotron SIS18 will be used in future mainly as the injector for the Facility for Anti-Proton and Ion Research (FAIR) being under construction. FAIR requires high beam brilliance and the UNILAC's RFQ electrodes must be upgraded with respect to their beam dynamics design. The new layout is currently being conducted at CERN with the aim of adjusting the electrode voltage according to the design voltage of 123 kV. CST simulations performed at GSI assure that the resonance frequency with the new electrode geometry is recuperated through corrections of the carrier rings. Simulations on the frequency dependence of the rings shapes and their impact on the voltage distribution along the RFQ are presented.
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TUPAF087	A Two-Stage Splitring-RFQ for High Current Ion Beams at Low Frequencies	simulation, impedance, acceleration, resonance	941
	M. Baschke, H. Podlech, A. Schempp IAP, Frankfurt am Main, Germany
	Funding: HIC for FAIR, BMBF Contr. No. 05P15RFRBA For several accelerator projects RFQs are the first stage of acceleration. To reach high intensities a new Splitring-RFQ is investigated. Not only a high current and high beam quality/brilliance should be achieved, also a good tuning flexibility and comfort for maintenance are part of the study. The RFQ will consist of two stages with 27 MHz and 54 MHz to accelerate ions with an A/q of 60 up to energies of 200 keV/u. RF simulations with CST MWS have been performed to obtain the quality factor, shunt impedance and voltage distribution as well as tuning possibilities. The results and the status of the project will be presented.
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TUPAF089	Initial Measurements on a New 10⁸ MHz 4-Rod CW RFQ Prototype for the HLI at GSI	simulation, dipole, linac, resonance	946
	D. Koser, K. Kümpel, H. Podlech IAP, Frankfurt am Main, Germany P. Gerhard GSI, Darmstadt, Germany O.K. Kester TRIUMF, Vancouver, Canada
	Funding: Work supported by BMBF Contr. No. 05P15RFBA and HIC for FAIR The High Charge State Injector (HLI) at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany, is one of the two injector linacs for the Universal Linear Accelerator (UNILAC) and is also planned to serve as dedicated injector for a proposed superconducting CW linac for heavy element research. Within the scope of an intended CW upgrade of the HLI front end, a replacement for the existing 4-rod RFQ is desirable since its stable operation and performance is severely impeded by mechanical vibrations of the electrodes and a high thermal sensitivity. With the aim of suppressing mechanical vibrations and providing efficient cooling considering high power CW operation, a completely new and improved 4-rod design was developed* with a focus on structural mechanical simulations using ANSYS. In order to validate the simulated RF performance, thermal behavior and structural mechanical characteristics, a 6-stem prototype was manufactured**. Initial low power RF measurements and basic piezo actuated mechanical investigations were done and the anticipated properties could be confirmed prior to planned high power RF tests and further mechanical vibration studies. D. Koser et al., THPIK021, Proc. of IPAC2017 D. Koser et al., MOPOY020, Proc. of IPAC2016 * D. Koser et al., TUPLR057, Proc. of LINAC2016
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TUPAF090	Measurements of the MYRRHA-RFQ at the IAP Frankfurt	dipole, simulation, controls, resonance	949
	K. Kümpel, D. Koser, S. Lamprecht, N.F. Petry, H. Podlech, A. Schempp, D. Strecker IAP, Frankfurt am Main, Germany A. Bechtold NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany C. Zhang GSI, Darmstadt, Germany
	Funding: Work supported by the EU Framework Programme H2020 662186 (MYRTE) The MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) Project is a planned accelerator driven system (ADS) which aims to demonstrate the feasibility of large scale transmutation. The first RF structure of the 600 MeV MYRRHA Linac will be a 176.1 MHz 4-Rod RFQ that will accelerate up to 4 mA protons in cw operation from 30 keV up to 1.5 MeV. The voltage along the approximately 4 m long electrodes has been chosen to 44 kV which limits the RF losses to about 25 kW/m. During the design of the structure a new method of dipole compensation has been applied. This paper describes the status of the RFQ and shows the results of the measurements done at IAP Frankfurt such as dipole and flatness measurement, vacuum tests and power tests up to 11 kW.
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TUPAK001	Progress of the Modulated 325 MHz Ladder RFQ	linac, proton, quadrupole, operation	952
	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 Ladder-RFQ features a very constant voltage along the axis. It accepted 3 times the operating power of which is 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 high symmetry. The results of the unmodulated prototype have shown, that the Ladder-RFQ is a suitable candidate for that frequency. The duty cycle is suitable up to 5%. The basic design and tendering of the RFQ has been successfully completed in 2016. Manufacturing will be completed in May 2018. We will show the latest results of manufacturing, beam dynamics simulations for the matching between LEBT and RFQ. Journal of Physics: Conf. Series 874 (2017) 012048 **Proceedings of LINAC2016, East Lansing, TUPLR053
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TUPAK008	Longitudinal Bunch Size Measurements with an RF Deflector at J-PARC LINAC	simulation, radio-frequency, linac, DTL	974
	M. Otani, K. Futatsukawa KEK, Tsukuba, Japan K. Hirano, A. Miura JAEA/J-PARC, Tokai-mura, Japan Y. Liu KEK/JAEA, Ibaraki-Ken, Japan T. Maruta FRIB, East Lansing, USA
	Measurement of the longitudinal bunch size is important for the stable beam operation. Especially in a medium energy beam transport (MEBT) located after a radio-frequency quadrupole in J-PARC, it is necessary to measure the bunch size with minimum set of equipment to avoid subsequent emittance growth due to space charge. We had proposed a longitudinal size measurement with an rf deflector normally used for deflecting theμbunch; phase spread is migrated to spatial one if the reference particle arrives at the deflector when the voltage is rising in time and is zero. Then a buncher cavity located upstream of the deflector is utilized to scan the phase spread to measure the longitudinal beam parameters. In this poster, recent measurement results are presented.
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TUPAK009	Muon Profile Measurement After Acceleration With a Radio-Frequency Quadrupole Linac	experiment, simulation, linac, positron	977
	M. Otani, Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, T. Yamazaki KEK, Tsukuba, Japan S. Bae, H. Choi, S. Choi, B. Kim, H.S. Ko SNU, Seoul, Republic of Korea K. Hasegawa, Y. Kondo, T. Morishita JAEA/J-PARC, Tokai-mura, Japan T. Iijima, Y. Sue Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan H. Iinuma, Y. Nakazawa Ibaraki University, Ibaraki, Japan K. Ishida RIKEN Nishina Center, Wako, Japan R. Kitamura University of Tokyo, Tokyo, Japan S. Li The University of Tokyo, Graduate School of Science, Tokyo, Japan G.P. Razuvaev Budker INP & NSU, Novosibirsk, Russia N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan E. Won Korea University, Seoul, Republic of Korea
	Funding: This work is supported by JSPS KAKENHI Grant Numbers JP15H03666, JP16H03987, and JP16J07784. The E34 experiment aims to measure muon anomalous magnetic moment with a precision of 0.1ppm. The experiment utilizes low emittance muon beam with a muon linac to sweep out beam related uncertainties, which limit the g-2 precision in past experiments. A beam matching with precise beam measurements is required to avoid substantial emittance growth and satisfy the experimental requirement on the beam emittance of around 1.5 pi mm mrad. We conduct profile measurement of muon after acceleration with a radio-frequency quadrupole (RFQ) on December 2017 following a first muon acceleration experiment on October. In the experiment of profile measurement, epi-thermal negative muonium ions are generated by injecting surface muons to a thin metal foil. The muonium ions are accelerated to 5 keV. by an electro-static lens and accelerated to 90 keV by the RFQ. Then the muonium ions are transported to a profile detector consisting of a micro-channel plate and a ccd camera via a quadrupole pair and a bending magnet. In this poster, the experimental result and comparison to the simulation are reported.
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TUPAL009	Studying a Prototype of Dual-beam Drift Tube Linac	DTL, cavity, simulation, acceleration	1020
	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
	For generating high-intensity ion beams from linear ac-celerators, a multi-beam acceleration method which in-volves multiple accelerating beams to suppress the defo-cusing force from space charge effects, then integrating these beams by a beam funneling system, has been pro-posed. An Inter-digital H-mode (IH) two-beam type radio frequency quadrupole (RFQ) with accelerating 108mA (54mA/channel×2) carbon ion from 5 to 60 keV/ u and an IH four-beam RFQ with accelerating 160.8mA (40.2mA/channel×4) carbon ion from 3.6 to 41.6 keV/u had been successfully designed for low energy heavy ion acceleration [1]. In order to demonstrate that an IH dual-beam drift tube linac (DB-DTL) is suitable for high-intensity heavy ion beam acceleration in middle energy region, we has been developing a DB-DTL prototype by using three dimensional electromagnetic CST MicroWave Studio (MWS) and using particles tracking Pi Mode Linac Orbit Calculation (PiMLOC) [2-3]. According to the simulation results, the beam dynamics design and elec-tromagnetic design will be presented in this paper. * Shota. Iketa et al., Nucl. Instr. and Meth. in Phys. Res. B.239-243 (2017).
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TUPAL010	Research on an Accelerator-Based BNCT Facility	neutron, target, proton, DTL	1024
	L. Lu, T. He, W. Ma, L.B. Shi, L.P. Sun, C.C. Xing, X.B. Xu, L. Yang IMP/CAS, Lanzhou, People's Republic of China
	Seven people have been diagnosed with cancer per minute in China, and cancer has been the leading cause of death with about one fourth of all deaths in China. As effective means and ways for cancer therapy, Boron Neutron Cancer Therapy (BNCT) has drawn greater attention. Accelerator based neutron source is a compact neutron source, and technologies of accelerating a high current beam has matured. We proposed an accelerator based BNCT (AB-BNCT), which can accelerate a 10 mA proton beam up to 7 MeV and target on a shelled-Beryllium. The dynamics of accelerators and neutron calculations will be reported in this paper.
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TUPAL011	Low Power Test and Tuning of the LEAF RFQ	quadrupole, cavity, dipole, operation	1028
	L. Lu, T. He, Y. He, W. Ma, L.B. Shi, L.P. Sun, C.C. Xing, X.B. Xu, L. Yang, H.W. Zhao IMP/CAS, Lanzhou, People's Republic of China
	A continuous wave (CW) four-vane radio frequency quadrupole (RFQ) accelerator is under construction for the Low Energy Accelerator Facility (LEAF) at Institute of Modern Physics (IMP). The 5.96 m RFQ will operate with the capability of accelerating all ion species from proton to uranium from 14 keV/u up to 500 keV/u. In this paper, the low power test and tuning results of the RFQ accelerator, including the test of the separate sections and the whole cavity, will be presented. After the final tuning, the relative error of the quadrupole field is within 2% and the admixture of the dipole modes are below 4% of the quadrupole mode.
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TUPAL012	Design and Fabrication of Hybrid RFQ Prototype	DTL, linac, cavity, site	1032
	P.Y. Yu, Y. He, C.X. Li, G.Z. Sun, F.F. Wang, Z.J. Wang, B. Zhang, T.M. Zhu 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. The complexi-ty of mechanical design and difficulty of fabrication are part of reasons impeding application of it and similar structures. In order to explore the practicable structure and research on RF parameters of this accelerating struc-ture, an aluminium prototype is developed.
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TUPAL015	Progress in the Realization and Commissioning of the Exotic Beam Facility SPES at INFN-LNL	cyclotron, target, proton, acceleration	1035
	G. Bisoffi, A. Andrighetto, P. Antonini, L. Bellan, D. Benini, J. Bermudez, D. Bortolato, M. Calderolla, M. Comunian, S. Corradetti, A. Facco, E. Fagotti, P. Favaron, A. Galatà, F. Galtarossa, M.G. Giacchini, F. Gramegna, A. Lombardi, M. Maggiore, M. Manzolaro, D. Marcato, T. Marchi, P. Mastinu, P. Modanese, M.F. Moisio, A. Monetti, M. Montis, A. Palmieri, S. Pavinato, D. Pedretti, A. Pisent, M. Poggi, G.P. Prete, C. R. Roncolato, M. Rossignoli, L. Sarchiapone, D. Scarpa, D. Zafiropoulos, L. de Ruvo INFN/LNL, Legnaro (PD), Italy V. Andreev ITEP, Moscow, Russia M.A. Bellato INFN- Sez. di Padova, Padova, Italy A.J. Mendez ORNL, Oak Ridge, Tennessee, USA
	SPES (Selective Production of Exotic Species) is an ISOL type facility for production and post-acceleration of exotic nuclei for forefront research in nuclear physics. Radioactive (RA) species (A=80/160) will be produced by fissions induced by a proton beam impinging on an UCx target: the proton beam will be delivered by a com-mercial cyclotron with a 40 MeV maximum energy and a 0.25 mA maximum current. The RA species, extracted from the Target-Ion-Source system as a 1+ beam , will be cooled in a RFQ (radiofrequency quadrupole) beam cool-er (RFQ-BC) and purified from the isobars contaminants through a High Resolution Mass Separator (HRMS). Post-acceleration will be performed via an ECR-based charge breeder, delivering the obtained q+ RA beam to a being built CW RFQ and to the being upgraded superconducting (sc) linac ALPI (up to 10 MeV/A for a mass-to-charge ratio A/q=7).
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TUPAL035	3D Beam Dynamics Modeling of MEBT for the New LANSCE RFQ Injector	emittance, quadrupole, proton, simulation	1081
	S.S. Kurennoy LANL, Los Alamos, New Mexico, USA
	The new RFQ-based proton injector at LANSCE requires a specialized medium-energy beam transfer (MEBT) after the RFQ at 750 keV due to a following long (~3 m) existing common transfer line that also serves for transporting negative-ion beams to the DTL entrance. The horizontal space for MEBT elements is limited because two beam lines merge at 18-degree angle. The MEBT design developed with envelope codes includes two compact quarter-wave RF bunchers and four short quadrupoles with steerers, all within the length of about 1 m. The beam size in the MEBT is large, comparable to the beam-pipe aperture, hence non-linear 3D field effects at large radii become important. Using CST Studio codes, we calculate buncher RF fields and quadrupole magnetic fields and use them to perform particle-in-cell beam dynamics modeling of MEBT with realistic beam distributions from the RFQ. Our results indicate a significant emittance growth not predicted by standard beam dynamics codes. Its origin was traced mainly to the quadrupole edge fields. Quadrupole design modifications are proposed to improve the MEBT performance.
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TUPAL039	Commissioning of the FRIB RFQ	controls, MMI, cavity, dipole	1090
	H.T. Ren, J.F. Brandon, N.K. Bultman, M.G. Konrad, H. Maniar, D.G. Morris, P. Morrison, G. Pozdeyev, X. Rao, R. Walker, S. Zhao FRIB, East Lansing, USA
	Funding: This work is supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 #wei@frib.msu.edu The radio-frequency quadrupole (RFQ) at the Facility for Rare Isotope Beams (FRIB) is a 4-vane type cavity designed to accelerate heavy ion beams with charge states Q/A between 1/7 and 1/3 from 12 keV/u to 0.5 MeV/u. The RFQ was assembled in the FRIB tunnel in November 2016. Bead-pull measurements and tuning were performed with low RF power. The RFQ has been conditioned to 59 kW in August 2017, which is sufficient to accelerate the Key Performance Parameter (KPP) beams, Argon and Krypton. The RFQ has been successful-ly commissioned with KPP beams in CW regime in Octo-ber 2017. 40Ar⁹⁺ and 86Kr¹⁷⁺ beams were accelerated by the FRIB RFQ in the CW regime to the designed energy of 0.5 MeV/u. With the multi-harmonic buncher operation-al, the FRIB RFQ commissioning has been completed with bunched beam in February 2018. The beam trans-mission efficiency through the RFQ was in good agree-ment with PARMTEQ simulation results. The detailed results from the FRIB RFQ tuning, high power condition-ing and beam commissioning will be presented in this paper.
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TUPAL046	Construction, Test, and Operation of a new RFQ at the Spallation Neutron Source (SNS)	operation, linac, ion-source, vacuum	1113
	Y.W. Kang, A.V. Aleksandrov, W.E. Barnett, M.S. Champion, M.T. Crofford, B. Han, S.W. Lee, J. Moss, R.T. Roseberry, J.P. Schubert, A.P. Shishlo, M.P. Stockli, C.M. Stone, R.F. Welton, D.C. Williams, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA C.C. Peters, J. Price ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: * This work was supported by SNS through UT-Battelle, LLC, under contract DEAC0500OR22725 for the U.S. DOE. A new RFQ was successfully installed recently in the SNS linac to replace the old RFQ that was used for more than a decade with certain operational limitations. The new RFQ was completely tested with H⁻ ion source in the Beam Test Facility (BTF) at SNS. For robust operation of SNS at 1.4 MW, the full design beam power and to satisfy the beam current requirement of the forthcoming SNS proton power upgrade (PPU) project, an RFQ with enhanced performance and reliability was needed. The new RFQ was built to have the beam parameters identical to those of the first RFQ but with improved RF and mechanical stability and reliability for continuous operation of neutron production. The tests confirmed that the new RFQ can run with high beam transmission efficiency at around 90 % and notably improved operational stability. In this paper, construction, test, installation, and operation of the new RFQ in SNS are discussed with the performance improvements.
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TUPAL050	Progress Work on a CW Deuteron RFQ with Magnetic Coupling Windows	cavity, experiment, coupling, Windows	1123
	Q. Fu, M.J. Easton, P.P. Gan, S.L. Gao, H.P. Li, Y.R. Lu, Q.Y. Tan, Z. Wang, K. Zhu PKU, Beijing, People's Republic of China W.P. Dou, Y. He IMP/CAS, Lanzhou, People's Republic of China
	Funding: This work was supported by the National Basic Research Program of China (Grant No. 2014CB845503). A new 162.5 MHz RFQ has been built for a joint 973 project between Peking University (PKU) and Institute of Modern Physics (IMP). It is designed to deliver 50-mA deuteron beams to 1 MeV in CW mode, with an inter-voltage of 60 kV and a length of 1.809 m. Due to its window-type structure, the RFQ has compact cross-section, sufficient mode separation and high specific shunt impedance. It consists of two segments fabricated and installed at IMP. The assembling error of the cavity is less than 0.05 mm. The RF measurements show good electrical properties of the resonant cavity with a measured unloaded quality factor equal to 96.4% of the simulated value. After tuning, we obtained the nominal frequency and field unbalance within 1.0%. Preparation of high-power test of this RFQ is underway. This paper will cover the fabrication details and RF measurements, as well as the progress of high-power test.
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TUPAL051	Program for High-Intensity RFQ Design With Matched and Equipartitioned Design Strategy	emittance, linac, ISOL, resonance	1126
	H.P. Li, M.J. Easton, Q. Fu, P.P. Gan, Y.R. Lu, Q.Y. Tan, Z. Wang, K. Zhu PKU, Beijing, People's Republic of China
	The deuteron driver accelerator of the Beijing Iso-tope Separation On-Line (BISOL) facility will acceler-ate and deliver a 20 mA deuteron beam to the targets with an energy of 40 MeV. As the injector of the driver linac, an RFQ is required to bunch and accelerate the 20 mA deuteron beam to 3 MeV with very high beam quality. In order to fulfil these requirements and re-duce time spent on optimization, an RFQ design pro-gram named RFQEP has been developed to generate the input file for the PARMTEQM code. In this program, the ‘matched and equipartitioned' design strategy is adopted to prevent halo formation and to avoid struc-ture resonances in high intensity RFQs. The detailed design aspects are studied in this paper and simulation results are given for an RFQ designed by this code, which shows the accuracy and the merits of the new program.
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TUPAL073	Conceptual Design of a Drift Tube LINAC for Proton Therapy	DTL, emittance, linac, proton	1182
	P.F. Ma, X. Guan, R. Tang, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng TUB, Beijing, People's Republic of China Y.H. Pu, J. Qiao, C.P. Wang, X.C. Xie, 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) The conceptual design of an Alvarez-type Drift Tube Linac for one proton therapy facility is described in this paper. The design optimization of the Drift Tube Linac is carried out in the principle of adopting domestic mature technologies and cost control. The error study of the Drift Tube Linac is also given in this paper.
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TUPAL076	Result of the First Muon Acceleration with Radio Frequency Quadrupole	acceleration, experiment, simulation, target	1190
	R. Kitamura University of Tokyo, Tokyo, Japan S. Bae, B. Kim SNU, Seoul, Republic of Korea Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, M. Otani, T. Yamazaki KEK, Tsukuba, Japan K. Hasegawa, Y. Kondo, T. Morishita JAEA/J-PARC, Tokai-mura, Japan H. Iinuma, Y. Nakazawa Ibaraki University, Ibaraki, Japan G.P. Razuvaev Budker INP & NSU, Novosibirsk, Russia N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan Y. Sue Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
	Funding: This work is supported by JSPS KAKENHI Grant Numbers JP15H03666, JP16H03987, and JP16J07784. J-PARC E34 experiment aims to measure the muon g-2/EDM precisely with novel techniques including the muon linear accelerator. Slow muon source by the metal foil method in order to cool the muon beam has been developed for the muon acceleration test with RF accelerator, because the muon beam derived from the proton driver was the tertiary beam and has a large emittance. The first verification test of the muon acceleration with RFQ was carried out at the muon test beam line of J-PARC MLF in October 2017. The incident surface muons were decelerated by the thin metal foil target and produced the negative muonium ions (Mu-), which is the bound stat of a positive muon and two electrons. After Mu- were extracted by a electrostatic accelerator as the injector of the RFQ, they were accelerated with RFQ to 88.6 keV. The accelerated Mu- were identified by the momentum selection with the bending magnet after the RFQ, and the measurement of the Time-Of-Flight. Accelerated Mu- were easily distinguished from penetrated positive muons by the difference of the polarity. The latest analysis result of the world's first muon acceleration with RFQ will be reported in this paper.
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TUPAL077	2D-3D PIC Code Benchmarking/Anchoring Comparisons For a Novel RFQ/RFI LINAC Design	space-charge, simulation, linac, experiment	1194
	S.J. Smith, S. Biedron, A. M. N. Elfrgani, E. Schamiloglu University of New Mexico, Albuquerque, USA M.S. Curtin, B. Hartman, T. Pressnall, D.A. Swenson Ion Linac Systems, Inc., Albuquerque, USA K. Kaneta CICS, Tokyo, Japan
	Funding: *The study at the University of New Mexico was supported in part by DARPA Grant N66001-16-1-4042 and gift to the University of New Mexico Foundation by ILS. In this study, comparisons are made between several particle dynamics codes (namely CST Particle Studio, GPT, and upgraded PARMILA codes) in order to benchmark them. The structure used for the simulations is a novel 200 MHz, 2.5 MeV, CW RFQ/RFI LINAC designed by Ion Linac Systems (ILS). The structure design and parameters are provided, simulation techniques are explained, and results from all three code families are presented. These results are then compared with each other, identifying similarities and differences. Numerous parameters for comparison are used, including the transmission efficiency, Q-factor, E-field on axis, and beam properties. Preliminary anchoring between modeling and simulation performance predictions and experimental measurements will be provided.
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TUPML016	High-Intensity Magnetron H⁻ Ion Sources and Injector Development at BNL Linac	operation, ion-source, injection, linac	1564
	A. Zelenski, G. Atoian, T. Lehn, D. Raparia, J. Ritter BNL, Upton, Long Island, New York, USA
	The BNL magnetron-type H⁻ ion source and the injec-tor are being upgraded to higher duty-factor as a part of Linac intensity increase project [1]. The BNL magnetron source presently delivers 110 -120 mA H⁻ ion current with 650 us pulse duration and 7 Hz repetition rate. The pulse duration was increased to 1000 μs by modifications of the gas injector pulsed valve and the use of the new arc-discharge power supply (with the arc-current stabilization circuit) which improved current stability and reduced current noise. The Low Energy Beam Transport (LEBT) lines combine two beams. The first line is the polarized OPPIS (Optically Pumped Polarized H⁻ Ion Source) beam-line and the second is the high-intensity un-polarized beam-line from the magnetron source, which transports beam to the RFQ after the passage of 45 degree bending magnet. The second magnetron source was installed in the straight LEBT section in 2017, in which the polarized OPPIS beam was not planned. In this, optimal for H⁻ beam transport configuration, the beam intensity was increased to 80 mA after the RFQ. The experience of the two sources layout operation (one source in operation the second source in standby) might be useful for facilities with the high downtime cost (like high-energy collider LHC or multi-user facilities like SNS).
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WEXGBF3	RF System for FRIB Accelerator	controls, cavity, LLRF, linac	1765
	D.G. Morris, J. Brandon, N.K. Bultman, K.D. Davidson, A. Facco, P.E. Gibson, L. Hodges, M.G. Konrad, T.L. Larter, H. Maniar, P. Morrison, P.N. Ostroumov, J.T. Popielarski, G. Pozdeyev, H.T. Ren, T. Russo, K. Schrock, R. Walker, J. Wei, T. Xu, Y. Xu, S. Zhao FRIB, East Lansing, USA A. Facco INFN/LNL, Legnaro (PD), Italy
	The RF system of the FRIB driver accelerator includes solid state amplifiers up to 18 kW operating at frequencies from 80.5 MHz to 322 MHz. Much higher power is required for the normal conducting RFQ, ~100 kW, and it is based on vacuum tubes. This invited talk presents the performance of solid state amplifiers and LLRF in off-line testing and on-line testing of the RFQ amplifier.
	Slides WEXGBF3 [14.107 MB]
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WEPAF001	A Diagnostic Test Bench for the LIGHT Accelerator	emittance, MMI, proton, DTL	1808
	A. Jeff, A. Benot-Morell, M. Caldara, P. Nadig A.D.A.M. SA, Meyrin, Switzerland
	The LIGHT accelerator is the first compact Linac that will deliver proton beams up to 230 MeV for cancer treatment. The accelerator is only 24m long and is being built to be modular and capable of changing proton beam energy and intensity pulse-to-pulse at up to 200Hz. The LIGHT prototype is currently being commissioned by AVO / ADAM at CERN, while the first full installation is foreseen in 2019. Here we present the design and implementation of a moveable diagnostic test bench which is used to measure a full set of beam properties at each commissioning step. Parameters measured include beam current, pulse length, energy, position, transverse profile and emittance. The compact instruments, the electronics and the controls that equip the test bench are the same as those who will be permanently installed along the accelerator after the commissioning. The first results obtained with the test bench for beams up to 16 MeV are shown here. We demonstrate that the chosen instrumentation achieves a very high sensitivity, dynamic range, reliability and immunity to EM noise. Procedures for on-line calibration of the instruments are also discussed.
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WEPAK004	Beam Instrumentation for CRYRING@ESR	injection, instrumentation, hardware, detector	2084
	A. Reiter, C. Andre, H. Bräuning, C. Dorn, P. Forck, R. Haseitl, T. Hoffmann, W. Kaufmann, N. Kotovski, P. Kowina, K. Lang, R. Lonsing, P.B. Miedzik, T. Milosic, A. Petit, H. Reeg, C. Schmidt, M. Schwickert, T. Sieber, R. Singh, G. Vorobjev, B. Walasek-Höhne, M. Witthaus GSI, Darmstadt, Germany
	We present the beam instrumentation of CRYRING@ESR, a low-energy experiment facility at the GSI Helmholtz-Centre for heavy ion research. The 1.44 Tm synchrotron and storage ring, formerly hosted at the Manne Siegbahn laboratory in Stockholm, Sweden, was modified in its configuration and installed behind the existing ESR, the experimental storage ring. As the first machine within the ongoing FAIR project, the facility for antiproton and ion research, it is built on the future timing system and frameworks for data supply and acquisition. Throughout the past year CRYRING was commissioned including its electron cooler with hydrogen beams from the local linear accelerator. Storage, acceleration and cooling have been demonstrated. The contribution provides an overview of the beam instrumentation. The design of the detector systems and their current performance are presented. Emphasis is given to beam position monitors, detectors for intensity measurements, and the ionization profile monitors.
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WEPMF004	The Saclay Test Stand for Conditioning the ESS RFQ Power Couplers at High RF Power	cavity, vacuum, linac, interface	2375
	N. Misiara, A.C. Chauveau, D. Chirpaz-Cerbat, P. Daniel-Thomas, M. Lacroix, L. Maurice CEA/IRFU, Gif-sur-Yvette, France M. Desmons, A. Dubois, A. Gaget, L. Napoly, M. Oublaid, G. Perreu, O. Piquet, B. Pottin, Y. Sauce CEA/DRF/IRFU, Gif-sur-Yvette, France
	The RF power coupler system for the RFQ of the ESS LINAC will feed 1.6 MW peak power through two coaxial loop couplers for a 352.21 MHz operation at the expected duty cycle. A specific test stand has been designed to condition the power couplers, and test the different auxiliary components in the nominal conditions of the RFQ. The power couplers were successfully assembled, installed and instrumented on the test cavity. This paper presents the general layout of the test stand, the installation and preparation of the power couplers for their conditioning at high RF power up to the ESS nominal conditions.
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THXGBE1	6D Beam Measurement, Challenges and Possibilities	simulation, experiment, quadrupole, linac	2890
	A.V. Aleksandrov, S.M. Cousineau, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA B.L. Cathey ORNL RAD, Oak Ridge, Tennessee, USA
	A system to measure the full 6D beam parameters (not 3x2D) has been built at the SNS RFQ test stand. Such a measurement will allow detailed analysis of the beam physics from a properly measured input term. This invited provides an overview of the principles and design of this system, and reports on status and results.
	Slides THXGBE1 [4.471 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THXGBE1
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THXGBF2	Beam Commissioning of the IFMIF EVEDA Very High Power RFQ	cavity, MMI, vacuum, operation	2902
	E. Fagotti, L. Antoniazzi, L. Bellan, D. Bortolato, M. Comunian, A. Facco, M.G. Giacchini, F. Grespan, M. Montis, A. Palmieri, A. Pisent, F. Scantamburlo INFN/LNL, Legnaro (PD), Italy B. Bolzon, N. Chauvin, R. Gobin CEA/IRFU, Gif-sur-Yvette, France P. Cara IFMIF/EVEDA, Rokkasho, Japan H. Dzitko, D. Gex, A. Jokinen, G. Phillips F4E, Germany T. Ebisawa, A. Kasugai, K. Kondo, K. Sakamoto, T. Shinya, M. Sugimoto QST, Aomori, Japan R. Heidinger, A. Marqueta, I. Moya Fusion for Energy, Garching, Germany P. Mereu INFN-Torino, Torino, Italy G. Pruneri Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova, Italy M. Weber CIEMAT, Madrid, Spain
	IFMIF, the International Fusion Materials Irradiation Facility, is an accelerator-based neutron source that will use Li(d, xn) reactions to generate a flux of neutrons with a broad peak at 14 MeV equivalent to the conditions of the Deuterium-Tritium reactions in a fusion power plant. IFMIF is conceived for fusion materials testing. The IFMIF prototype linear accelerator (LIPAc) is jointly developed by Europe and Japan within the IFMIF EVEDA project: it is composed of an ion source, a LEBT, an RFQ, a MEBT and a SC linac, with a final energy of 9 MeV. The 4-vane Radio Frequency Quadrupole (RFQ), developed by INFN in Italy, will accelerate a 130 mA deuteron beam from 0.1 to 5 MeV in continuous wave, for a beam power of 650 kW. The 9.8 m long 175 MHz cavity is composed of 18 x 0.54 m long modules flanged together and aligned within 0.3 mm tolerance. The RFQ was completed, delivered and assembled at the Rokkasho site and is presently under extended RF tests. The second phase of beam commissioning (up to 2.5 MeV/u) was scheduled to start at the end of 2017. Several unexpected issues and incidents significantly delayed the original program, which is however proceeding step by step toward the full achievement of its goals.
	Slides THXGBF2 [5.318 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-THXGBF2
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THYGBF2	PIP-II Injector Test Warm Front End: Commissioning Update	kicker, operation, emittance, focusing	2943
	L.R. Prost, R. Andrews, C.M. Baffes, J.-P. Carneiro, B.E. Chase, A.Z. Chen, E. Cullerton, P. Derwent, J.P. Edelen, J. Einstein-Curtis, D. Frolov, B.M. Hanna, D.W. Peterson, G.W. Saewert, A. Saini, V.E. Scarpine, A.V. Shemyakin, V.L. Sista, J. Steimel, D. Sun, A. Warner Fermilab, Batavia, Illinois, USA C.J. Richard NSCL, East Lansing, Michigan, USA V.L. Sista BARC, Mumbai, India
	Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics The Warm Front End (WFE) of the Proton Improvement Plan II Injector Test [1] at Fermilab has been constructed to its full length. It includes a 15-mA DC, 30-keV H⁻ ion source, a 2 m-long Low Energy Beam Transport (LEBT) with a switching dipole magnet, a 2.1 MeV CW RFQ, followed by a Medium Energy Beam Transport (MEBT) with various diagnostics and a dump. This report presents the commissioning status, focusing on beam measurements in the MEBT. In particular, a beam with the parameters required for injection into the Booster (5 mA, 0.55 ms macro-pulse at 20 Hz) was transported through the WFE.
	Slides THYGBF2 [2.434 MB]
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THPAF082	Frequency Jump at Low Energies	linac, emittance, bunching, simulation	3176
	C. Zhang GSI, Darmstadt, Germany H. Podlech IAP, Frankfurt am Main, Germany
	One or more radio-frequency jumps are usually necessary for realizing a ≥100 AMeV/u proton or ion driver linac. Typically, such jumps happen in the range of β = 0.2-0.6 between the resonator structures fitting to this β-range, e.g. DTL, HWR, CCL or elliptical cavities. We propose to perform the first frequency jump already at low energies (β ≤ 0.1) between two RFQ accelerators, which can bring some unique advantages. First studies have been performed and the results proved that this idea is feasible and promising. Many efforts have been and are being made to address the most critical issue for the jumps i.e. the beam matching at the transition.
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THPAK018	Recent Developments in DEMIRCI for RFQ Design	software, simulation, multipole, cavity	3243
	E. Celebi IBU, Istanbul, Turkey O. Cakir, G. Turemen Ankara University, Faculty of Sciences, Ankara, Turkey G. Turemen TAEK, Ankara, Turkey G. Unel UCI, Irvine, California, USA
	Funding: This project has been supported by TUBITAK with project number 114F10⁶ and 117F143. DEMIRCI software aims to aid RFQ design efforts by making the process easy, fast and accurate. In this report, DEMIRCI 8-term potential results are compared with the results provided by other commercially available simulation software. Computed electric fields are compared to the re- sults from simulations of a recently produced 352 MHz RFQ. Recent developments like the inclusion of space charge ef- fects in DEMIRCI beam dynamics are also discussed. More- over, further terms are added to 8-term potential to simulate possible vane production errors. The FEM solver was also improved to mesh the cells with errors.
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THPAK019	Beam Dynamics of the First Beams for IFMIF-EVEDA RFQ Commissioning	proton, extraction, emittance, solenoid	3246
	L. Bellan, C. Baltador, M. Comunian, E. Fagotti, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy T. Akagi KEK, Ibaraki, Japan B. Bolzon, N. Chauvin CEA/DSM/IRFU, France H. Dzitko F4E, Germany K. Kondo, M. Sugimoto QST, Aomori, Japan I. Podadera CIEMAT, Madrid, Spain F. Scantamburlo IFMIF/EVEDA, Rokkasho, Japan
	The installation of the IFMIF-EVEDA RFQ, MEBT, LEBT, source and beam dump was completed in September 2017. The beam dynamics of the first beams for the IFMIF-EVEDA RFQ commissioning is presented. Moreover, a proposal for the CW RFQ steady state commissioning is shown, with a focus on the beam dynamics challenges of the beam transport after the RFQ.
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THPAK022	Beam Dynamic Simulation for the Beam Line from Charge Breeder to ALPI for SPES Project	simulation, linac, experiment, quadrupole	3255
	M. Comunian, L. Bellan, A. Pisent INFN/LNL, Legnaro (PD), Italy A.V. Ziiatdinova ITEP, Moscow, Russia A.V. Ziiatdinova MEPhI, Moscow, Russia
	The SPES project (Selective Production of Exotic Species) is under development at INFN-LNL. This facility is intended for production of neutron-rich Radioactive Ion Beams (RIBs) by ISOL method. The +1 charged beam will be transformed to n+ charge by Charge Breeder (Electron Cyclotron resonance ion source) and reaccelerated by the ALPI (Acceleratore Lineare Per Ioni) superconducting Linac . This paper includes results of beam dynamic simulation at the beam line from Charge Breeder to ALPI.
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THPAK075	Simulation of Particle Interactions in a High Intensity Radio-Frequency Quadrupole for Molecular Hydrogen Ions	proton, simulation, electron, acceleration	3405
	M.J. Easton, H.P. Li, Y.R. Lu, Z. Wang PKU, Beijing, People's Republic of China J. Qiang LBNL, Berkeley, California, USA
	High-intensity deuteron accelerators run the risk of deuteron-deuteron interactions leading to activation. For this reason, in the commissioning phase, a molecular hydrogen ion (H²⁺) beam is often used as a model for the deuteron beam without the radiation risk. However, composite ions are susceptible to particle interactions that do not affect single ions, such as stripping of electrons and charge exchange. Such interactions affect the beam dynamics results, and may lead to production of secondary particles, which in high-intensity beams may cause damage to the accelerator and reduce the quality of the beam. In order to understand these effects, we have modified the IMPACT-T particle tracking code to include particle interactions during the tracking simulation through a high-intensity continuous-wave (CW) radio-frequency quadrupole (RFQ). This code is also designed to be easily extensible to other interactions, such as collisions or break-up of heavier ions. Preliminary results and possibilities for future development will be discussed.
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THPAK076	Development and Benchmarking of the IMPACT-T Code	linac, SRF, simulation, space-charge	3408
	H.P. Li, M.J. Easton, Y.R. Lu, Z. Wang PKU, Beijing, People's Republic of China J. Qiang LBNL, Berkeley, California, USA
	The multi-particle tracking code IMPACT-T is widely used to calculate the particle motion in high intensity linacs. The code is a self-consistent three-dimensional beam dynamics simulation toolbox that utilizes the particle-in-cell method in the time domain. In the collaboration between PKU and LBNL, an RFQ module was implemented to the IMPACT-T code, which enables simulations of the accelerator front-end. In order to benchmark the newly developed module in the IMPACT-T code, we have simulated the beam transport in Beijing Isotope Separation On-Line (BISOL) high intensity deuteron driver linac. It consists of a 3 MeV RFQ and 40 MeV superconducting HWR linac with five cryomodules. After comparing the simulation results with PARMTEQM, TraceWin and Toutatis, we obtained a very good agreement, which represents the validation of the new code.
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THPAK112	Toward an End-to-End Model for ISAC-I Accelerators	ISAC, linac, simulation, TRIUMF	3500
	O. Shelbaya, O.K. Kester TRIUMF, Vancouver, Canada
	Diurnal-like transmission variations in the ISAC-I warm accelerator system necessitates periodic retuning by operators. While beam loss points are well known, re-tuning nevertheless results in additional downtime and reduced count rates at experiments. This has motivated the development of an end-to-end simulation of the ISAC-I linear accelerator (linac) system to understand and characterize the nature of transmission instabilities spanning several hours to days.
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THPAL002	RF System Operation of High Current RFQ in ADS Project	cavity, operation, coupling, LLRF	3613
	L.P. Sun, R. Huang, C.X. Li, L. Lu, A. Shi, L.B. Shi, W.B. Wang, X.B. Xu, H.W. Zhao IMP/CAS, Lanzhou, People's Republic of China Y. Hu TUB, Beijing, People's Republic of China
	Funding: Work supported by Natural Science Foundation of China， No.11505253 New RF system has been upgraded several times for high-current operation, especially for extra beam power and detuning angle. The current was increased gradually resulting in more and more frequency detuning, and an effective method is to tune the temperature of cavity to compromise detuning. Of course, the power dissipated in cavity and high intensity beam are approximately 120kW resulting in too many power modules operated in the high risk of failure. The specific analysis and simulation were introduced in detail.
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THPAL007	Upgrade of PIAVE Superconducting RFQs at INFN-Legnaro	SRF, operation, cavity, superconducting-RF	3623
	G. Bisoffi, E. Bissiato, D. Bortolato, F. Chiurlotto, T. Contran, E. Fagotti, A. Minarello, P. Modanese, E. Munaron, D. Scarpa INFN/LNL, Legnaro (PD), Italy V. Andreev ITEP, Moscow, Russia A. Bosotti, R. Paparella INFN/LASA, Segrate (MI), Italy L.M.A. Ferreira CERN, Geneva, Switzerland K. Kasprzak IFJ-PAN, Kraków, Poland R.C. Pardo ANL, Argonne, Illinois, USA
	Superconducting RFQs (SRFQs), the first SC RFQs ever made operational for users, have been operated on the PIAVE SC heavy ion linac injector at INFN-Legnaro since 2006. The structure is split into two resonators and is limited to the accelerating RFQ sections. The resonators had never exceeded 80% of the design accelerating fields. In 2015, an upgrade plan started, aimed at increasing the accelerating fields, while improving their slow and fast tuning systems, repairing degraded components, imple-menting a LASER alignment method. The upgrade plan was successfully concluded in summer 2017. The resona-tors were kept stably locked for days at a field larger than the nominal one. Eventually, a test beam was accelerated successfully for 72 hours, with negligible locking issues. SRFQs entered once again routine operation in December 2017. The new features will allow to accelerate heavy ions with an A/q value as high as 8.5 (versus a former maximum A/q=7.5), allowing operation of the very first accelerated uranium beams at INFN-LNL, after the relat-ed authorizations shall have been issued.
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THPAL008	A RFQ Cooler Development	ion-source, emittance, quadrupole, injection	3627
	M. Cavenago, L. Bellan, M. Comunian, M. Maggiore, L. Pranovi INFN/LNL, Legnaro (PD), Italy G. Maero, N. Panzeri, M. Romé Universita' degli Studi di Milano e INFN, Milano, Italy
	Funding: INFN group 5 (exp. PLASMA4BEAM) The cooling of beams of exotic nuclei (both in energy spread and in transverse oscillations) is critical to downstream mass spectrometry devices and can be provided by collisions with light gases as in the Radio Frequency Quadrupole Cooler (RFQC). As in other traps, several electromagnetic systems can be used for beam deceleration confinement and deceleration, as a radiofrequency (rf) quadrupole, a magnetic solenoid and electrostatic acceleration. Since rf contributes both to beam cooling and heating, operational parameters should be carefully optimized. The LNL RFQC prototype is going to be placed inside the existing Eltrap solenoid, capable of providing a magnetic flux density component B_z up to 0.2 T, where z is the solenoid axis. Setup progress and related rf component development are reported; in particular simple matching boxes are discussed; the differential gas pumping system is also described.
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THPAL112	RF Matching Circuit for CANREB RFQ	TRIUMF, network, simulation, pick-up	3902
	T. Au, B. Barquest, J.J. Keir, V. Zvyagintsev TRIUMF, Vancouver, Canada
	A RF matching circuit has been developed to provide two phase RF voltage of 1.2 kVpp at 3 MHz and 6 MHz for the CANREB RFQ structure with an equivalent capacitive load of 300 pF. The RF matching circuit utilizes pi-network with two phase transformer. Beyond RF drive the CANREB structure requires pulse DC bias with amplitude up to 500 V. Results of development and testing of RF matching circuit and filters are presented in this paper.
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THPAL116	Development and Installation of the CANREB RFQ Buncher at TRIUMF	bunching, TRIUMF, operation, emittance	3914
	B. Barquest, F. Ames, T. Au, L. Graham, M.R. Pearson, V. Zvyagintsev TRIUMF, Vancouver, Canada J. Bale, J. Dilling, R. Kruecken, Y. Lan UBC & TRIUMF, Vancouver, British Columbia, Canada G. Gwinner University of Manitoba, Manitoba, Canada N. Janzen, R.A. Simpson UW/Physics, Waterloo, Ontario, Canada R. Kanungo Saint Mary's University, Halifax, Canada
	Funding: TRIUMF receives federal funding via the National Research Council of Canada. CANREB is funded by the Canada Foundation for Innovation (CFI), the Provinces NS, MB and TRIUMF. Pure, intense rare isotope beams at a wide range of energies are crucial to the nuclear science programs at TRIUMF. The CANREB project will deliver a high resolution spectrometer (HRS) for beam purification, and a charge breeding system consisting of a radiofrequency quadrupole (RFQ) beam cooler and buncher, an electron beam ion source (EBIS), and a Nier-type spectrometer to prepare the beam for post-acceleration. Bunching the beam prior to charge breeding will significantly enhance the efficiency of the EBIS. The RFQ buncher will accept continuous §I{60}{keV} rare isotope beams from the ARIEL or ISAC production targets and efficiently deliver low emittance bunched beams. A pulsed drift tube (PDT) will adjust the energy of the bunched beam for injection into the EBIS to match the acceptance of the post-accelerating RFQ. Ion optical simulations were carried out to inform the design of the RFQ buncher and PDT. Simulations indicate that delivery of up to 10⁷~ions per bunch with high efficiency is possible. Experience with previous beam bunchers was also brought to bear in the design effort. Installation of the RFQ is under way, and tests with offline beam are expected to be performed in late 2018.
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THPAL122	Beam Performance Study of an RF Structure to Accelerate or Bunch Low Energy Ion Beams	booster, space-charge, ISAC, bunching	3931
	S.D. Rädel, S. Kiy, R.E. Laxdal, O. Shelbaya TRIUMF, Vancouver, Canada
	The 35.4MHz Radio Frequency Quadrupole (RFQ) at the ISAC-I facility at TRIUMF is designed to accelerate ions from an energy of 2.04 keV/u to 150 keV/u for a large range of mass-to-charge ratios (A/Q). A multi-harmonic, 11.8MHz, buncher is used to provide a time focus at the RFQ entrance. Due to limits in the ion source HV platform a boost in the energy is required for higher mass beams (20 ≤ A/Q ≤ 30) to provide energy matching into the RFQ. To achieve this, a 3-gap, 11.8 MHz RF booster has been installed into the ISAC-I facility downstream of the buncher and upstream of the RFQ. The device can operate as an accelerator to match into the RFQ or as a second pre-buncher to improve capture in the RFQ and reduce sensitivity to space charge. Proof-of-principle measurements demonstrating various aspects of the performance will be reported and compared against expectations.
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THPML059	Re-Commissioning the Front End Test Stand Negative Hydrogen Ion Source, Beam Transport and Interlocks	ion-source, vacuum, MMI, high-voltage	4769
	S.R. Lawrie, R.E. Abel, M. Dudman, D.C. Faircloth, A.P. Letchford, J.H. Macgregor, M. Perkins, T. M. Sarmento, R.C. Searle, M. Whitehead, T. Wood STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The front end test stand (FETS) is a demonstrator for a future high intensity, high duty factor negative hydrogen (H') ion injector. With the radio-frequency quadrupole (RFQ) nearing installation, the ion source has been re-commissioned in preparation for long-term operation. The 3 MeV beam exceeds the radio-activation energy of common engineering materials, so radiation shielding has been erected. A new interlocking scheme has been signed-off which integrates the existing ion source high voltage area with the new shielding access points, to ensure that the machine can operate safely during beam production. The existing vacuum arrangement has been extended to in-clude the RFQ and medium energy beam transport (MEBT) line. A new programmable logic controller (PLC) has been built to operate the entire vacuum chain. The ion source high voltage equipment has been upgraded to minimise both spark rate and intensity. A collimating aperture and Faraday cup have been installed after the low energy beam transport (LEBT) section to ensure the beam is well aligned for injection into the RFQ. Re-commissioning the ion source has given a rugged shakedown of all these new systems before beam is required for the RFQ. *scott.lawrie@stfc.ac.uk
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THPML119	A Time-of-Flight Based Energy Measurement System for the LIGHT Medical Accelerator	MMI, proton, cavity, linac	4951
	F. Galizzi University of Bergamo, Bergamo, Italy M. Caldara, F. Galizzi, A. Jeff A.D.A.M. SA, Meyrin, Switzerland
	The LIGHT proton therapy facility is the first compact Linac that will deliver proton beams up to 230 MeV for cancer treatment. The proton beam is pulsed; pulses repetition rate can reach 200 Hz. LIGHT prototype is currently being commissioned by AVO/ADAM at CERN, while the first full installation is foreseen in 2019. Beam energy translates directly to range penetration in the body, so it is of the utmost importance to monitor it accurately especially for Linacs, since each beam pulse is directly transported to the patient. We present the implementation of a non-interceptive beam energy measurement system based on the Time-of-Flight technique. Unlike state of the art ToF systems this one has been designed to measure autonomously the mean energy of the beam with medical resolution (0.03 %) by processing as little as 1 us of data providing the result within 1 to 2 ms over an energy range from 5 to 230 MeV. The first results for beams up to 7.5 MeV are shown.
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FRXGBD3	Application of Carbon Nanotube Wire for Beam Profile Measurement of Negative Hydrogen Ion Beam	electron, operation, linac, beam-loading	5022
	A. Miura, K. Moriya JAEA/J-PARC, Tokai-mura, Japan T. Miyao KEK, Ibaraki, Japan
	A wire scanner monitor using metallic wire is reliably employed for the beam profile measurement in the J-PARC linac. Because the loading of negative hydrogen (H⁻) ion beam on a wire increases under high-current beam operation, we focus on using a high-durability beam profile monitors by attaching another wire material. Carbon nanotubes (CNT) are made of graphite in a cylindrical shape and have a tensile strength not less than 100 times that of steel. The electric conductivity has higher than that of metals, and hardness is endured thermally around 3000°C in a vacuum circumstance. We applied the CNT wires to WSM and measured transverse profiles with a 3-MeV and 191-MeV H⁻ beam. As a result, we obtained the equivalent signal levels taken by carbon wire made of polyacrylonitrile without any damage. In this paper, the signal response when the CNT is irradiated with an H⁻ beam and the result of beam profile measurement. In addition, the surface of CNT after 3-MeV beam operation was observed.
	Slides FRXGBD3 [2.558 MB]
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FRXGBF1	Re-Acceleration of Ultra Cold Muon in J-PARC Muon Facility	linac, experiment, acceleration, emittance	5041
	Y. Kondo, K. Hasegawa, T. Morishita JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan S. Bae, H. Choi, S. Choi, B. Kim, H.S. Ko SNU, Seoul, Republic of Korea Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, M. Otani, K. Shimomura, T. Yamazaki, M. Yoshida KEK, Tsukuba, Japan N. Hayashizaki RLNR, Tokyo, Japan T. Iijima, Y. Sue Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan H. Iinuma, Y. Nakazawa Ibaraki University, Ibaraki, Japan K. Ishida RIKEN Nishina Center, Wako, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan Y. Iwata NIRS, Chiba-shi, Japan R. Kitamura University of Tokyo, Tokyo, Japan S. Li The University of Tokyo, Graduate School of Science, Tokyo, Japan G.P. Razuvaev Budker INP & NSU, Novosibirsk, Russia N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Funding: This work is supported by JSPS KAKENHI Grant Numbers JP15H03666, JP16H03987, and JP16J07784. J-PARC is developing the reacceleration system of the ultra slow (30 meV) muon (USM) obtained by two-photon laser resonant ionization of muonium atoms. The muon beam thus obtained has low emittance, meeting the requirement for the g-2/EDM experiment. J-PARC E34 experiment aims to measure the muon anomalous magnetic moment (g-2) with a precision of 0.1 ppm and search for EDM with a sensitivity to 10^-21 e cm. The USM's are accelerated to 212 MeV by using a muon dedicated linac to be a ultra cold muon beam. The muon LINAC consists of an RFQ, a inter-digital H-mode DTL, disk and washer coupled cell structures, and disk loaded structures. The ultra-cold muons will have an extremely small transverse momentum spread of 0.1% with a normalized transverse emittance of around 1.5 pi mm-mrad. Proof of the slow muon acceleration scheme is an essential step to realize the world first muon linac. In October 2017, we have succeeded to accelerate slow negative muoniums generated using a simpler muonium source to 89 keV. In this talk, present design of the muon linac and the result of the world first muon acceleration experiment are reported.
	Slides FRXGBF1 [8.373 MB]
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Paper

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Other Keywords

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MOZGBF1

FRIB Front End Construction and Commissioning

MMI, ECR, operation, ion-source

58

G. Pozdeyev
FRIB, East Lansing, Michigan, USA

The Facility for Rare Isotope Beams (FRIB) is based upon the CW, SC driver linac to accelerate all the stable isotopes up to more than 200 MeV/u with a beam power of 400 kW. The front end (FE) commissioning shall start in 2017. This invited talk presents the FRIB front end design, and current status of FRIB front end commissioning, including beam properties and energy, and their relationship to FRIB operational requirements.

Slides MOZGBF1 [2.965 MB]

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MOPML014

Status of the Commissioning of the LIGHT Prototype

DTL, MMI, linac, proton

425

A. Degiovanni, J. Adam, D. Aguilera Murciano, S. Ballestrero, A. Benot-Morell, R. Bonomi, F.C.M. Cabaleiro Magallanes, M. Caldara, G. D'Auria, G. De Michele, M. Esposito, S. Fanella, D. Fazio, D.A. Fink, Y. Fusco, M. Gonzalez, P. Gradassi, A. Jeff, 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. Cerv, V.A. Dimov, L.S. Esposito, S. H. Gibson, M. Giunta, Ye. Ivanisenko, V. F. Khan, S. Magnoni, C. Mellace, J.L. Navarro Quirante, H. Pavetits, PPA. Paz Neira, P. Stabile, K. Stachyra, D. Ungaro, A. Valloni, C. Zannini
AVO-ADAM, Meyrin, Switzerland

The company A.D.A.M. (Application of Detectors and Accelerators to Medicine), a CERN spin-off, is working on the construction and testing of its first linear accelerator for medical application: LIGHT (Linac for Image-Guided Hadron Therapy). LIGHT is an innovative high frequency proton linac designed to accelerate proton beams up to 230 MeV for protontherapy applications. The LIGHT accelerator consists of three different linac sections: 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 Cell Coupled 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. A prototype of LIGHT is presently under commissioning at CERN. This paper describes the design aspects and the different stages of installation and commissioning of the LIGHT prototype with emphasis on beam tests results obtained during the past year at different energies.

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MOPML017

Status and Development of the MYRRHA Injector

cavity, diagnostics, linac, MMI

432

D. Mäder, H. Höltermann, D. Koser, B. Koubek, K. Kümpel, P. Müller, U. Ratzinger, M. Schwarz, W. Schweizer
BEVATECH, Frankfurt, Germany
C. Angulo, J. Belmans, D. Davin, W. De Cock, P. Della Faille, F. Doucet, A. Gatera, Pompon, F.F. Pompon, D. Vandeplassche
Studiecentrum voor Kernenergie - Centre d'Étude de l'énergie Nucléaire (SCK•CEN), Mol, Belgium
M. Busch, H. Hähnel, H. Podlech
IAP, Frankfurt am Main, Germany

The MYRRHA project aims at coupling a cw 600 MeV, 4 mA proton linac with a sub-critical reactor as the very first prototype nuclear reactor to be driven by a particle accelerator (ADS). Among several applications, MYRRHA main objective is to demonstrate the principle of partitioning and transmutation (P&T) as a viable solution to drastically reduce the radiotoxicity of long-life nuclear waste. For this purpose, the linac needs an unprecedented level of reliability in terms of allowable beam trips. The normal conducting injector delivers 16.6 MeV protons to the superconducting main linac. The first section of the injector (up to 5.9 MeV) consists of an ECR source, a 4-Rod-RFQ and a rebunching line followed by 7 individual CH-type cavities. This entire section will be set up and operated by SCK·CEN in Louvain-la-Neuve, Belgium, for ample performance and reliability testing. The first CH cavity has been sent for power tests to IAP Frankfurt, Germany. The most recent status of all cavities, couplers and the beam diagnostics of the MYRRHA injector is presented in this paper.

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MOPML027

Status of Carbon Commissioning of the MedAustron Therapy Accelerator

MMI, synchrotron, linac, ion-source

457

C. Schmitzer, L. Adler, A. De Franco, F. Farinon, N. Gambino, G. Guidoboni, M. Kronberger, C. Kurfürst, S. Myalski, S. Nowak, M.T.F. Pivi, I. Strašík, A. Wastl
EBG MedAustron, Wr. Neustadt, Austria
L.C. Penescu
Abstract Landscapes, Montpellier, France

The MedAustron therapy accelerator is intended to treat cancer patients with proton and carbon beams of 62-252 MeV and 120-400 MeV respectively. The accelerator features three Supernanogan ECR ion sources, a 400 keV/u RFQ and a 7 MeV/u interdigital H-mode Linac. A middle energy beam transfer line also serves as injector into a 77m synchrotron from which the beam may be transferred to 4 different irradiation rooms, 3 of which are dedicated to medical treatment. The therapy accelerator is in clinical operation since end 2016 and is currently solely configured for the use of protons. The next clinical objective is to enable treatments using C⁶⁺ ions which triggered the carbon commissioning of the accelerator in 2017. This paper will discuss the latest results from carbon commissioning in the different sections of the accelerator, achieved efficiencies and outlook on future carbon activities.

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TUPAF002

Beam Commissioning of the 750 MHz Proton RFQ for the LIGHT Prototype

MMI, linac, emittance, diagnostics

658

V.A. Dimov, M. Caldara, A. Degiovanni, L.S. Esposito, D.A. Fink, M. Giunta, A. Jeff, A. Valloni
AVO-ADAM, Meyrin, Switzerland
A.M. Lombardi, S.J. Mathot, M. Vretenar
CERN, Geneva, Switzerland

ADAM (Application of Detectors and Accelerators to Medicine), a CERN spin-off company, is developing the Linac for Image Guided Hadron Therapy, LIGHT, which will accelerate proton beams up to 230 MeV. The design of the linac will allow fast intensity and energy modulation for pencil-beam scanning during cancer treatment. The linac consists of a 40 keV Proton Injector; a 750 MHz Radio Frequency Quadrupole (RFQ) accelerating the proton beam up to 5 MeV; a 3 GHz Side Coupled Drift Tube Linac (SCDTL) up to 37.5 MeV; and a 3 GHz Cell Coupled Linac (CCL) section up to 230 MeV. A prototype of LIGHT is being commissioned progressively with the installation of the accelerating structures at a CERN site. The beam commissioning of the RFQ, which was designed and built by CERN, was completed in 2017 using a movable beam diagnostic test bench with various instruments. This paper reports on the RFQ commissioning strategy and the results of the beam measurements.

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TUPAF012

Commissioning of the Lipac Medium Energy Beam Transport Line

cavity, vacuum, controls, operation

683

I. Podadera, J. Castellanos, J.M. García, D. Gavela, A. Ibarra, D. Jiménez-Rey, A. Marqueta, L.M. Martinez Fresno, E. Molina Marinas, J. Mollá, P. Méndez, C. Oliver, D. Regidor, F. Toral, R. Varela, V. Villamayor, M. Weber, C. de la Morena
CIEMAT, Madrid, Spain
P. Cara, A. Marqueta, I. Moya
Fusion for Energy, Garching, Germany
T. Ebisawa, Y. Hirata, A. Ihara, Y. Ikeda, A. Kasugai, T. Kitano, K. Kondo, T. Narita, K. Sakamoto, T. Shinya, M. Sugimoto
QST, Aomori, Japan
D. Gex, A. Jokinen
F4E, Germany
J. Knaster
IFMIF/EVEDA, Rokkasho, Japan
M. Mendez Macias
7S, Peligros (Granada), Spain
O. Nomen
IREC, Sant Adria del Besos, Spain
G. Pruneri
Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova, Italy
F. Scantamburlo
INFN/LNL, Legnaro (PD), Italy

Funding: This work has been funded by the Spanish Ministry of Economy and Competitiveness under the Agreement as published in BOE, 16/01/2013, page 1988 and the project FIS2013-40860-R.
LIPAc* will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology to be used as neutron source of the IFMIF facility. Those facilities are essential for future fusion reactors material research. A 175 MHz RFQ will increase the energy up to 5 MeV before a Superconducting RF (SRF) linac with eight 175 MHz Half Wave Resonators brings the particles up to the final energy of 9 MeV. Between both stages, a Medium Energy Beam Transport line (MEBT)** aims at transporting and matching the beam between the RFQ and the SRF linac. The transverse focusing of the beam is controlled by five quadrupole magnets with integrated steerers, grouped in one triplet and one doublet. Two buncher cavities handle the longitudinal dynamics. Two movable scraper systems are included to purify the beam optics coming out the RFQ and avoid losses in the SRF linac. In this contribution, checkout of the beamline and its ancillaries in Japan is reported. Tests carried out on the beamline prior to the MEBT beam commissioning are described, focusing in vacuum tests, magnets powering, buncher conditioning and scrapers movement.
* P. Cara et al., IPAC16, MOPOY057 , p.985, Busan, Korea (2016)
** I. Podadera et al., LINAC2016, TUPLR041, p.554, East Lansing, USA (2016).

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TUPAF016

Increase of IPHI Beam Power at CEA Saclay

neutron, proton, detector, target

694

F. Senée, F. Benedetti, E. Giner-Demange, A. Gomes, M. Oublaid
CEA/DRF/IRFU, Gif-sur-Yvette, France
P. Ausset, M. Ben Abdillah, C. Joly
IPN, Orsay, France
F. Belloni, B. Bolzon, N. Chauvin, M. Desmons, Y. Gauthier, C. Marchand, J. Marroncle, T. Papaevangelou, G. Perreu, O. Piquet, B. Pottin, Y. Sauce, J. Schwindling, L. Segui, O. Tuske, D. Uriot
CEA/IRFU, Gif-sur-Yvette, France
F. Harrault, R. Touzery
CEA/DSM/IRFU, France

For the first time, in April 2016, the SILHI source produced a proton beam for IPHI RFQ. Due to several technical difficulties on the RFQ water cooling skid, a short RF power pulse (100 μs at the beginning until few hundred microseconds) is injected into the RFQ accelerates the high intensity proton beam up to 3 MeV. The repetition rate is tuned between 1 and 5 Hz. Under these conditions, the beam power after the RFQ is lower than 100 W. At the end of 2017, the 352 MHz RFQ conditioning has been completed (with the same duty cycle) and the proton beam has been accelerated. The increase of the beam power is expected to continue in 2018 in order to reach several kilowatts by the end of the year. In addition, two Ionization beam Profile Monitors (IPM) developed for ESS have been tested on the deviated beam line with a very low duty cycle. The IPHI facility should demonstrate the possibility to produce neutrons with a flexible compact accelerator in the framework of the SONATE project. This paper presents the status of the IPHI project in April 2018.

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TUPAF041

Residual Gas Ions Characterization from the REXEBIS

detector, ISOL, experiment, electron

784

N. Bidault, M.L. Lozano, J.A. Rodriguez
CERN, Geneva, Switzerland

The Isotope mass Separator On-Line DEvice (ISOLDE) is a user facility located at CERN where Radioactive Ion Beams (RIBs) are produced from proton collisions onto a target, mass separated and transported to user experimental stations either directly at low energy or after being post- accelerated, notably for nuclear physics studies. Prior to acceleration through the REX/HIE-ISOLDE linear acceler- ator, the ion beam is accumulated, bunched and cooled in a Penning trap (REXTRAP) and afterwards charge-bred in an Electron Beam Ion Source (REXEBIS). Multi-charged radioactive species of interest are then selected by a mass-to- charge (A/q) ratio separator dipole in the Low Energy Beam Transfer Line (LEBT). A method is presented to character- ize the Residual Gas Ion (RGI) background contamination for diﬀerent operational conditions of the REXEBIS. More particularly, a discussion is held about the inﬂuence of the conﬁnement time inside the charge-breeder on the residual gas spectrum. Finally, a method to identify sub-pico-Ampere contaminants is demonstrated.

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TUPAF064

Preparation Towards the Ess Linac Ion Source and Lebt Beam Commissioning on Ess Site

MMI, linac, solenoid, site

874

R. Miyamoto, M. Eshraqi, A. Jansson, E. Laface, Y. Levinsen, O. Midttun, N. Milas, M. Muñoz, D.C. Plostinar, A. Ponton, E. Sargsyan, L. Tchelidze
ESS, Lund, Sweden
L. Celona, L. Neri
INFN/LNS, Catania, Italy
W. Ledda
Vitrociset s.p.a, Roma, Italy

Beam commissioning of the proton linac of the European Spallation Source begin in summer, 2018, from the ion source (IS) and low energy beam transport (LEBT), and continues in stages until 2022, when the first beam is sent to its spallation target. This paper presents the plan, status, and highlights of preparation works for the upcoming IS and LEBT beam commissioning.

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TUPAF067

Beam Physics Analysis of the ESS RFQ Non-Conformities

alignment, emittance, ion-source, radio-frequency-quadrupole

886

A. Ponton
ESS, Lund, Sweden

During the fabrication of an RFQ, deviation from the perfect geometry will occur during assembling, brazing and machining the different parts. These geometrical defects will also impact the theoretical inter-vane voltage, given by the beam dynamics, even if tuners can correct partially the effect of the manufacturing. The combination of geometrical and voltage errors will alter the electro-magnetic field in the axis region leading to a degradation of the beam quality. The study proposes to expand the method to treat the voltage errors presented in * , in which the deviation from the theoretical parameters is represented by a sum of periodic functions of z, to the machining errors and to include positioning and alignment errors. The results of the error study will be presented. Then, using the results of the fabrication control by metrology, we will analyze the impact of the real RFQ geometry on the beam transport and compare the results will the prediction from the error study.
* A. Ponton et al., "Voltage errors studies in the ESS RFQ", presented at the 7th Int. Particle Accelerator Conf. (IPAC'16), Busan, Korea, May 2016, paper THPMB039.

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TUPAF068

Functional Integration of the RFQ in the ESS Systems

cavity, controls, LLRF, vacuum

890

J.S. Schmidt, E. Bargalló, T. Fay, G. Hulla, B. Lagoguez, R. Montaño, E. Sargsyan, S. Scolari, H. Spoelstra
ESS, Lund, Sweden
A.C. Chauveau, M. Desmons, O. Piquet
CEA/IRFU, Gif-sur-Yvette, France
A.J. Johansson
Lund University, Lund, Sweden
W. Ledda
Vitrociset s.p.a, Roma, Italy

The 352 MHz Radio Frequency Quadrupole (RFQ) for the European Spallation Source ERIC (ESS) will be delivered during 2018. After delivery, installation and tuning of the cavity, the high power RF conditioning will be performed. At this point all the different systems that are needed to condition and operate the RFQ have to be in place and operational. This paper will give an overview of the system analysis that has been performed for the RFQ. The RFQ requirements for the RF system, including the RF distribution system (RFDS), the Low Level RF (LLRF) and the local RF protection system (RFLPS) will be presented. In addition, the paper covers the system integration of the structure in the ESS control and vacuum systems as well as the outcome of a machine protection analysis.

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TUPAF077

Beam Optics Measurements in Medium Energy Beam Transport at PIP-II Injector Test Facility

quadrupole, optics, beam-transport, emittance

909

A. Saini, J.-P. Carneiro, B.M. Hanna, L.R. Prost, A.V. Shemyakin
Fermilab, Batavia, Illinois, USA
V.L. Sista
BARC, Mumbai, India

Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics
The Proton Improvement Plan-II Injector Test (PIP2IT) is an accelerator test facility under construction at Fermilab that will provide a platform to demonstrate critical technologies and concept of the front-end of the PIP-II linear accelerator (linac). The PIP2IT warm front-end comprises a H⁻ ion source capable of delivering 15 mA, 30 keV DC or pulsed beam, a Low Energy Beam Transport (LEBT), a 162.5 MHz, CW Radio Frequency Quadrupole (RFQ) that accelerates the beam to 2.1 MeV and, a 14 m medium energy beam transport (MEBT). Presently, beamline up to the MEBT has been commissioned and operates routinely at the PIP2IT facility. In this paper, we discuss beam measurements performed at the MEBT to analyze beam emittance and its RMS sizes along the MEBT. In addition, beam based calibration of the beamline elements using differential trajectory measurement is also presented.

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TUPAF086

Adaption of the HSI -RFQ Rf-Properties to an Improved Beam Dynamics Layout

simulation, operation, linac, resonance

938

M. Vossberg, L. Groening, S. Mickat, H. Vormann, C. Xiao
GSI, Darmstadt, Germany
V. Bencini, J.M. Garland, J.-B. Lallement, A.M. Lombardi
CERN, Geneva, Switzerland

The GSI accelerator facility comprising the linear accelerator UNILAC and the synchrotron SIS18 will be used in future mainly as the injector for the Facility for Anti-Proton and Ion Research (FAIR) being under construction. FAIR requires high beam brilliance and the UNILAC's RFQ electrodes must be upgraded with respect to their beam dynamics design. The new layout is currently being conducted at CERN with the aim of adjusting the electrode voltage according to the design voltage of 123 kV. CST simulations performed at GSI assure that the resonance frequency with the new electrode geometry is recuperated through corrections of the carrier rings. Simulations on the frequency dependence of the rings shapes and their impact on the voltage distribution along the RFQ are presented.

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TUPAF087

A Two-Stage Splitring-RFQ for High Current Ion Beams at Low Frequencies

simulation, impedance, acceleration, resonance

941

M. Baschke, H. Podlech, A. Schempp
IAP, Frankfurt am Main, Germany

Funding: HIC for FAIR, BMBF Contr. No. 05P15RFRBA
For several accelerator projects RFQs are the first stage of acceleration. To reach high intensities a new Splitring-RFQ is investigated. Not only a high current and high beam quality/brilliance should be achieved, also a good tuning flexibility and comfort for maintenance are part of the study. The RFQ will consist of two stages with 27 MHz and 54 MHz to accelerate ions with an A/q of 60 up to energies of 200 keV/u. RF simulations with CST MWS have been performed to obtain the quality factor, shunt impedance and voltage distribution as well as tuning possibilities. The results and the status of the project will be presented.

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TUPAF089

Initial Measurements on a New 10⁸ MHz 4-Rod CW RFQ Prototype for the HLI at GSI

simulation, dipole, linac, resonance

946

D. Koser, K. Kümpel, H. Podlech
IAP, Frankfurt am Main, Germany
P. Gerhard
GSI, Darmstadt, Germany
O.K. Kester
TRIUMF, Vancouver, Canada

Funding: Work supported by BMBF Contr. No. 05P15RFBA and HIC for FAIR
The High Charge State Injector (HLI) at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany, is one of the two injector linacs for the Universal Linear Accelerator (UNILAC) and is also planned to serve as dedicated injector for a proposed superconducting CW linac for heavy element research. Within the scope of an intended CW upgrade of the HLI front end, a replacement for the existing 4-rod RFQ is desirable since its stable operation and performance is severely impeded by mechanical vibrations of the electrodes and a high thermal sensitivity*. With the aim of suppressing mechanical vibrations and providing efficient cooling considering high power CW operation, a completely new and improved 4-rod design was developed** with a focus on structural mechanical simulations using ANSYS. In order to validate the simulated RF performance, thermal behavior and structural mechanical characteristics, a 6-stem prototype was manufactured***. Initial low power RF measurements and basic piezo actuated mechanical investigations were done and the anticipated properties could be confirmed prior to planned high power RF tests and further mechanical vibration studies.
* D. Koser et al., THPIK021, Proc. of IPAC2017
** D. Koser et al., MOPOY020, Proc. of IPAC2016
*** D. Koser et al., TUPLR057, Proc. of LINAC2016

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TUPAF090

Measurements of the MYRRHA-RFQ at the IAP Frankfurt

dipole, simulation, controls, resonance

949

K. Kümpel, D. Koser, S. Lamprecht, N.F. Petry, H. Podlech, A. Schempp, D. Strecker
IAP, Frankfurt am Main, Germany
A. Bechtold
NTG Neue Technologien GmbH & Co KG, Gelnhausen, Germany
C. Zhang
GSI, Darmstadt, Germany

Funding: Work supported by the EU Framework Programme H2020 662186 (MYRTE)
The MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) Project is a planned accelerator driven system (ADS) which aims to demonstrate the feasibility of large scale transmutation. The first RF structure of the 600 MeV MYRRHA Linac will be a 176.1 MHz 4-Rod RFQ that will accelerate up to 4 mA protons in cw operation from 30 keV up to 1.5 MeV. The voltage along the approximately 4 m long electrodes has been chosen to 44 kV which limits the RF losses to about 25 kW/m. During the design of the structure a new method of dipole compensation has been applied. This paper describes the status of the RFQ and shows the results of the measurements done at IAP Frankfurt such as dipole and flatness measurement, vacuum tests and power tests up to 11 kW.

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TUPAK001

Progress of the Modulated 325 MHz Ladder RFQ

linac, proton, quadrupole, operation

952

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 Ladder-RFQ features a very constant voltage along the axis. It accepted 3 times the operating power of which is 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 high symmetry. The results of the unmodulated prototype have shown, that the Ladder-RFQ is a suitable candidate for that frequency. The duty cycle is suitable up to 5%. The basic design and tendering of the RFQ has been successfully completed in 2016. Manufacturing will be completed in May 2018. We will show the latest results of manufacturing, beam dynamics simulations for the matching between LEBT and RFQ.
*Journal of Physics: Conf. Series 874 (2017) 012048
**Proceedings of LINAC2016, East Lansing, TUPLR053

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TUPAK008

Longitudinal Bunch Size Measurements with an RF Deflector at J-PARC LINAC

simulation, radio-frequency, linac, DTL

974

M. Otani, K. Futatsukawa
KEK, Tsukuba, Japan
K. Hirano, A. Miura
JAEA/J-PARC, Tokai-mura, Japan
Y. Liu
KEK/JAEA, Ibaraki-Ken, Japan
T. Maruta
FRIB, East Lansing, USA

Measurement of the longitudinal bunch size is important for the stable beam operation. Especially in a medium energy beam transport (MEBT) located after a radio-frequency quadrupole in J-PARC, it is necessary to measure the bunch size with minimum set of equipment to avoid subsequent emittance growth due to space charge. We had proposed a longitudinal size measurement with an rf deflector normally used for deflecting theμbunch; phase spread is migrated to spatial one if the reference particle arrives at the deflector when the voltage is rising in time and is zero. Then a buncher cavity located upstream of the deflector is utilized to scan the phase spread to measure the longitudinal beam parameters. In this poster, recent measurement results are presented.

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TUPAK009

Muon Profile Measurement After Acceleration With a Radio-Frequency Quadrupole Linac

experiment, simulation, linac, positron

977

M. Otani, Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, T. Yamazaki
KEK, Tsukuba, Japan
S. Bae, H. Choi, S. Choi, B. Kim, H.S. Ko
SNU, Seoul, Republic of Korea
K. Hasegawa, Y. Kondo, T. Morishita
JAEA/J-PARC, Tokai-mura, Japan
T. Iijima, Y. Sue
Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
H. Iinuma, Y. Nakazawa
Ibaraki University, Ibaraki, Japan
K. Ishida
RIKEN Nishina Center, Wako, Japan
R. Kitamura
University of Tokyo, Tokyo, Japan
S. Li
The University of Tokyo, Graduate School of Science, Tokyo, Japan
G.P. Razuvaev
Budker INP & NSU, Novosibirsk, Russia
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
E. Won
Korea University, Seoul, Republic of Korea

Funding: This work is supported by JSPS KAKENHI Grant Numbers JP15H03666, JP16H03987, and JP16J07784.
The E34 experiment aims to measure muon anomalous magnetic moment with a precision of 0.1ppm. The experiment utilizes low emittance muon beam with a muon linac to sweep out beam related uncertainties, which limit the g-2 precision in past experiments. A beam matching with precise beam measurements is required to avoid substantial emittance growth and satisfy the experimental requirement on the beam emittance of around 1.5 pi mm mrad. We conduct profile measurement of muon after acceleration with a radio-frequency quadrupole (RFQ) on December 2017 following a first muon acceleration experiment on October. In the experiment of profile measurement, epi-thermal negative muonium ions are generated by injecting surface muons to a thin metal foil. The muonium ions are accelerated to 5 keV. by an electro-static lens and accelerated to 90 keV by the RFQ. Then the muonium ions are transported to a profile detector consisting of a micro-channel plate and a ccd camera via a quadrupole pair and a bending magnet. In this poster, the experimental result and comparison to the simulation are reported.

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TUPAL009

Studying a Prototype of Dual-beam Drift Tube Linac

DTL, cavity, simulation, acceleration

1020

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

For generating high-intensity ion beams from linear ac-celerators, a multi-beam acceleration method which in-volves multiple accelerating beams to suppress the defo-cusing force from space charge effects, then integrating these beams by a beam funneling system, has been pro-posed. An Inter-digital H-mode (IH) two-beam type radio frequency quadrupole (RFQ) with accelerating 108mA (54mA/channel×2) carbon ion from 5 to 60 keV/ u and an IH four-beam RFQ with accelerating 160.8mA (40.2mA/channel×4) carbon ion from 3.6 to 41.6 keV/u had been successfully designed for low energy heavy ion acceleration [1]. In order to demonstrate that an IH dual-beam drift tube linac (DB-DTL) is suitable for high-intensity heavy ion beam acceleration in middle energy region, we has been developing a DB-DTL prototype by using three dimensional electromagnetic CST MicroWave Studio (MWS) and using particles tracking Pi Mode Linac Orbit Calculation (PiMLOC) [2-3]. According to the simulation results, the beam dynamics design and elec-tromagnetic design will be presented in this paper.
* Shota. Iketa et al., Nucl. Instr. and Meth. in Phys. Res. B.239-243 (2017).

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TUPAL010

Research on an Accelerator-Based BNCT Facility

neutron, target, proton, DTL

1024

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

Seven people have been diagnosed with cancer per minute in China, and cancer has been the leading cause of death with about one fourth of all deaths in China. As effective means and ways for cancer therapy, Boron Neutron Cancer Therapy (BNCT) has drawn greater attention. Accelerator based neutron source is a compact neutron source, and technologies of accelerating a high current beam has matured. We proposed an accelerator based BNCT (AB-BNCT), which can accelerate a 10 mA proton beam up to 7 MeV and target on a shelled-Beryllium. The dynamics of accelerators and neutron calculations will be reported in this paper.

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TUPAL011

Low Power Test and Tuning of the LEAF RFQ

quadrupole, cavity, dipole, operation

1028

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

A continuous wave (CW) four-vane radio frequency quadrupole (RFQ) accelerator is under construction for the Low Energy Accelerator Facility (LEAF) at Institute of Modern Physics (IMP). The 5.96 m RFQ will operate with the capability of accelerating all ion species from proton to uranium from 14 keV/u up to 500 keV/u. In this paper, the low power test and tuning results of the RFQ accelerator, including the test of the separate sections and the whole cavity, will be presented. After the final tuning, the relative error of the quadrupole field is within 2% and the admixture of the dipole modes are below 4% of the quadrupole mode.

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TUPAL012

Design and Fabrication of Hybrid RFQ Prototype

DTL, linac, cavity, site

1032

P.Y. Yu, Y. He, C.X. Li, G.Z. Sun, F.F. Wang, Z.J. Wang, B. Zhang, T.M. Zhu
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. The complexi-ty of mechanical design and difficulty of fabrication are part of reasons impeding application of it and similar structures. In order to explore the practicable structure and research on RF parameters of this accelerating struc-ture, an aluminium prototype is developed.

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TUPAL015

Progress in the Realization and Commissioning of the Exotic Beam Facility SPES at INFN-LNL

cyclotron, target, proton, acceleration

1035

G. Bisoffi, A. Andrighetto, P. Antonini, L. Bellan, D. Benini, J. Bermudez, D. Bortolato, M. Calderolla, M. Comunian, S. Corradetti, A. Facco, E. Fagotti, P. Favaron, A. Galatà, F. Galtarossa, M.G. Giacchini, F. Gramegna, A. Lombardi, M. Maggiore, M. Manzolaro, D. Marcato, T. Marchi, P. Mastinu, P. Modanese, M.F. Moisio, A. Monetti, M. Montis, A. Palmieri, S. Pavinato, D. Pedretti, A. Pisent, M. Poggi, G.P. Prete, C. R. Roncolato, M. Rossignoli, L. Sarchiapone, D. Scarpa, D. Zafiropoulos, L. de Ruvo
INFN/LNL, Legnaro (PD), Italy
V. Andreev
ITEP, Moscow, Russia
M.A. Bellato
INFN- Sez. di Padova, Padova, Italy
A.J. Mendez
ORNL, Oak Ridge, Tennessee, USA

SPES (Selective Production of Exotic Species) is an ISOL type facility for production and post-acceleration of exotic nuclei for forefront research in nuclear physics. Radioactive (RA) species (A=80/160) will be produced by fissions induced by a proton beam impinging on an UCx target: the proton beam will be delivered by a com-mercial cyclotron with a 40 MeV maximum energy and a 0.25 mA maximum current. The RA species, extracted from the Target-Ion-Source system as a 1+ beam , will be cooled in a RFQ (radiofrequency quadrupole) beam cool-er (RFQ-BC) and purified from the isobars contaminants through a High Resolution Mass Separator (HRMS). Post-acceleration will be performed via an ECR-based charge breeder, delivering the obtained q+ RA beam to a being built CW RFQ and to the being upgraded superconducting (sc) linac ALPI (up to 10 MeV/A for a mass-to-charge ratio A/q=7).

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TUPAL035

3D Beam Dynamics Modeling of MEBT for the New LANSCE RFQ Injector

emittance, quadrupole, proton, simulation

1081

S.S. Kurennoy
LANL, Los Alamos, New Mexico, USA

The new RFQ-based proton injector at LANSCE requires a specialized medium-energy beam transfer (MEBT) after the RFQ at 750 keV due to a following long (~3 m) existing common transfer line that also serves for transporting negative-ion beams to the DTL entrance. The horizontal space for MEBT elements is limited because two beam lines merge at 18-degree angle. The MEBT design developed with envelope codes includes two compact quarter-wave RF bunchers and four short quadrupoles with steerers, all within the length of about 1 m. The beam size in the MEBT is large, comparable to the beam-pipe aperture, hence non-linear 3D field effects at large radii become important. Using CST Studio codes, we calculate buncher RF fields and quadrupole magnetic fields and use them to perform particle-in-cell beam dynamics modeling of MEBT with realistic beam distributions from the RFQ. Our results indicate a significant emittance growth not predicted by standard beam dynamics codes. Its origin was traced mainly to the quadrupole edge fields. Quadrupole design modifications are proposed to improve the MEBT performance.

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TUPAL039

Commissioning of the FRIB RFQ

controls, MMI, cavity, dipole

1090

H.T. Ren, J.F. Brandon, N.K. Bultman, M.G. Konrad, H. Maniar, D.G. Morris, P. Morrison, G. Pozdeyev, X. Rao, R. Walker, S. Zhao
FRIB, East Lansing, USA

Funding: This work is supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 #wei@frib.msu.edu
The radio-frequency quadrupole (RFQ) at the Facility for Rare Isotope Beams (FRIB) is a 4-vane type cavity designed to accelerate heavy ion beams with charge states Q/A between 1/7 and 1/3 from 12 keV/u to 0.5 MeV/u. The RFQ was assembled in the FRIB tunnel in November 2016. Bead-pull measurements and tuning were performed with low RF power. The RFQ has been conditioned to 59 kW in August 2017, which is sufficient to accelerate the Key Performance Parameter (KPP) beams, Argon and Krypton. The RFQ has been successful-ly commissioned with KPP beams in CW regime in Octo-ber 2017. 40Ar⁹⁺ and 86Kr¹⁷⁺ beams were accelerated by the FRIB RFQ in the CW regime to the designed energy of 0.5 MeV/u. With the multi-harmonic buncher operation-al, the FRIB RFQ commissioning has been completed with bunched beam in February 2018. The beam trans-mission efficiency through the RFQ was in good agree-ment with PARMTEQ simulation results. The detailed results from the FRIB RFQ tuning, high power condition-ing and beam commissioning will be presented in this paper.

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TUPAL046

Construction, Test, and Operation of a new RFQ at the Spallation Neutron Source (SNS)

operation, linac, ion-source, vacuum

1113

Y.W. Kang, A.V. Aleksandrov, W.E. Barnett, M.S. Champion, M.T. Crofford, B. Han, S.W. Lee, J. Moss, R.T. Roseberry, J.P. Schubert, A.P. Shishlo, M.P. Stockli, C.M. Stone, R.F. Welton, D.C. Williams, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA
C.C. Peters, J. Price
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: * This work was supported by SNS through UT-Battelle, LLC, under contract DEAC0500OR22725 for the U.S. DOE.
A new RFQ was successfully installed recently in the SNS linac to replace the old RFQ that was used for more than a decade with certain operational limitations. The new RFQ was completely tested with H⁻ ion source in the Beam Test Facility (BTF) at SNS. For robust operation of SNS at 1.4 MW, the full design beam power and to satisfy the beam current requirement of the forthcoming SNS proton power upgrade (PPU) project, an RFQ with enhanced performance and reliability was needed. The new RFQ was built to have the beam parameters identical to those of the first RFQ but with improved RF and mechanical stability and reliability for continuous operation of neutron production. The tests confirmed that the new RFQ can run with high beam transmission efficiency at around 90 % and notably improved operational stability. In this paper, construction, test, installation, and operation of the new RFQ in SNS are discussed with the performance improvements.

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TUPAL050

Progress Work on a CW Deuteron RFQ with Magnetic Coupling Windows

cavity, experiment, coupling, Windows

1123

Q. Fu, M.J. Easton, P.P. Gan, S.L. Gao, H.P. Li, Y.R. Lu, Q.Y. Tan, Z. Wang, K. Zhu
PKU, Beijing, People's Republic of China
W.P. Dou, Y. He
IMP/CAS, Lanzhou, People's Republic of China

Funding: This work was supported by the National Basic Research Program of China (Grant No. 2014CB845503).
A new 162.5 MHz RFQ has been built for a joint 973 project between Peking University (PKU) and Institute of Modern Physics (IMP). It is designed to deliver 50-mA deuteron beams to 1 MeV in CW mode, with an inter-voltage of 60 kV and a length of 1.809 m. Due to its window-type structure, the RFQ has compact cross-section, sufficient mode separation and high specific shunt impedance. It consists of two segments fabricated and installed at IMP. The assembling error of the cavity is less than 0.05 mm. The RF measurements show good electrical properties of the resonant cavity with a measured unloaded quality factor equal to 96.4% of the simulated value. After tuning, we obtained the nominal frequency and field unbalance within 1.0%. Preparation of high-power test of this RFQ is underway. This paper will cover the fabrication details and RF measurements, as well as the progress of high-power test.

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TUPAL051

Program for High-Intensity RFQ Design With Matched and Equipartitioned Design Strategy

emittance, linac, ISOL, resonance

1126

H.P. Li, M.J. Easton, Q. Fu, P.P. Gan, Y.R. Lu, Q.Y. Tan, Z. Wang, K. Zhu
PKU, Beijing, People's Republic of China

The deuteron driver accelerator of the Beijing Iso-tope Separation On-Line (BISOL) facility will acceler-ate and deliver a 20 mA deuteron beam to the targets with an energy of 40 MeV. As the injector of the driver linac, an RFQ is required to bunch and accelerate the 20 mA deuteron beam to 3 MeV with very high beam quality. In order to fulfil these requirements and re-duce time spent on optimization, an RFQ design pro-gram named RFQEP has been developed to generate the input file for the PARMTEQM code. In this program, the ‘matched and equipartitioned' design strategy is adopted to prevent halo formation and to avoid struc-ture resonances in high intensity RFQs. The detailed design aspects are studied in this paper and simulation results are given for an RFQ designed by this code, which shows the accuracy and the merits of the new program.

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TUPAL073

Conceptual Design of a Drift Tube LINAC for Proton Therapy

DTL, emittance, linac, proton

1182

P.F. Ma, X. Guan, R. Tang, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng
TUB, Beijing, People's Republic of China
Y.H. Pu, J. Qiao, C.P. Wang, X.C. Xie, 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)
The conceptual design of an Alvarez-type Drift Tube Linac for one proton therapy facility is described in this paper. The design optimization of the Drift Tube Linac is carried out in the principle of adopting domestic mature technologies and cost control. The error study of the Drift Tube Linac is also given in this paper.

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TUPAL076

Result of the First Muon Acceleration with Radio Frequency Quadrupole

acceleration, experiment, simulation, target

1190

R. Kitamura
University of Tokyo, Tokyo, Japan
S. Bae, B. Kim
SNU, Seoul, Republic of Korea
Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, M. Otani, T. Yamazaki
KEK, Tsukuba, Japan
K. Hasegawa, Y. Kondo, T. Morishita
JAEA/J-PARC, Tokai-mura, Japan
H. Iinuma, Y. Nakazawa
Ibaraki University, Ibaraki, Japan
G.P. Razuvaev
Budker INP & NSU, Novosibirsk, Russia
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
Y. Sue
Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan

Funding: This work is supported by JSPS KAKENHI Grant Numbers JP15H03666, JP16H03987, and JP16J07784.
J-PARC E34 experiment aims to measure the muon g-2/EDM precisely with novel techniques including the muon linear accelerator. Slow muon source by the metal foil method in order to cool the muon beam has been developed for the muon acceleration test with RF accelerator, because the muon beam derived from the proton driver was the tertiary beam and has a large emittance. The first verification test of the muon acceleration with RFQ was carried out at the muon test beam line of J-PARC MLF in October 2017. The incident surface muons were decelerated by the thin metal foil target and produced the negative muonium ions (Mu-), which is the bound stat of a positive muon and two electrons. After Mu- were extracted by a electrostatic accelerator as the injector of the RFQ, they were accelerated with RFQ to 88.6 keV. The accelerated Mu- were identified by the momentum selection with the bending magnet after the RFQ, and the measurement of the Time-Of-Flight. Accelerated Mu- were easily distinguished from penetrated positive muons by the difference of the polarity. The latest analysis result of the world's first muon acceleration with RFQ will be reported in this paper.

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TUPAL077

2D-3D PIC Code Benchmarking/Anchoring Comparisons For a Novel RFQ/RFI LINAC Design

space-charge, simulation, linac, experiment

1194

S.J. Smith, S. Biedron, A. M. N. Elfrgani, E. Schamiloglu
University of New Mexico, Albuquerque, USA
M.S. Curtin, B. Hartman, T. Pressnall, D.A. Swenson
Ion Linac Systems, Inc., Albuquerque, USA
K. Kaneta
CICS, Tokyo, Japan

Funding: *The study at the University of New Mexico was supported in part by DARPA Grant N66001-16-1-4042 and gift to the University of New Mexico Foundation by ILS.
In this study, comparisons are made between several particle dynamics codes (namely CST Particle Studio, GPT, and upgraded PARMILA codes) in order to benchmark them. The structure used for the simulations is a novel 200 MHz, 2.5 MeV, CW RFQ/RFI LINAC designed by Ion Linac Systems (ILS). The structure design and parameters are provided, simulation techniques are explained, and results from all three code families are presented. These results are then compared with each other, identifying similarities and differences. Numerous parameters for comparison are used, including the transmission efficiency, Q-factor, E-field on axis, and beam properties. Preliminary anchoring between modeling and simulation performance predictions and experimental measurements will be provided.

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TUPML016

High-Intensity Magnetron H⁻ Ion Sources and Injector Development at BNL Linac

operation, ion-source, injection, linac

1564

A. Zelenski, G. Atoian, T. Lehn, D. Raparia, J. Ritter
BNL, Upton, Long Island, New York, USA

The BNL magnetron-type H⁻ ion source and the injec-tor are being upgraded to higher duty-factor as a part of Linac intensity increase project [1]. The BNL magnetron source presently delivers 110 -120 mA H⁻ ion current with 650 us pulse duration and 7 Hz repetition rate. The pulse duration was increased to 1000 μs by modifications of the gas injector pulsed valve and the use of the new arc-discharge power supply (with the arc-current stabilization circuit) which improved current stability and reduced current noise. The Low Energy Beam Transport (LEBT) lines combine two beams. The first line is the polarized OPPIS (Optically Pumped Polarized H⁻ Ion Source) beam-line and the second is the high-intensity un-polarized beam-line from the magnetron source, which transports beam to the RFQ after the passage of 45 degree bending magnet. The second magnetron source was installed in the straight LEBT section in 2017, in which the polarized OPPIS beam was not planned. In this, optimal for H⁻ beam transport configuration, the beam intensity was increased to 80 mA after the RFQ. The experience of the two sources layout operation (one source in operation the second source in standby) might be useful for facilities with the high downtime cost (like high-energy collider LHC or multi-user facilities like SNS).

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WEXGBF3

RF System for FRIB Accelerator

controls, cavity, LLRF, linac

1765

D.G. Morris, J. Brandon, N.K. Bultman, K.D. Davidson, A. Facco, P.E. Gibson, L. Hodges, M.G. Konrad, T.L. Larter, H. Maniar, P. Morrison, P.N. Ostroumov, J.T. Popielarski, G. Pozdeyev, H.T. Ren, T. Russo, K. Schrock, R. Walker, J. Wei, T. Xu, Y. Xu, S. Zhao
FRIB, East Lansing, USA
A. Facco
INFN/LNL, Legnaro (PD), Italy

The RF system of the FRIB driver accelerator includes solid state amplifiers up to 18 kW operating at frequencies from 80.5 MHz to 322 MHz. Much higher power is required for the normal conducting RFQ, ~100 kW, and it is based on vacuum tubes. This invited talk presents the performance of solid state amplifiers and LLRF in off-line testing and on-line testing of the RFQ amplifier.

Slides WEXGBF3 [14.107 MB]

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WEPAF001

A Diagnostic Test Bench for the LIGHT Accelerator

emittance, MMI, proton, DTL

1808

A. Jeff, A. Benot-Morell, M. Caldara, P. Nadig
A.D.A.M. SA, Meyrin, Switzerland

The LIGHT accelerator is the first compact Linac that will deliver proton beams up to 230 MeV for cancer treatment. The accelerator is only 24m long and is being built to be modular and capable of changing proton beam energy and intensity pulse-to-pulse at up to 200Hz. The LIGHT prototype is currently being commissioned by AVO / ADAM at CERN, while the first full installation is foreseen in 2019. Here we present the design and implementation of a moveable diagnostic test bench which is used to measure a full set of beam properties at each commissioning step. Parameters measured include beam current, pulse length, energy, position, transverse profile and emittance. The compact instruments, the electronics and the controls that equip the test bench are the same as those who will be permanently installed along the accelerator after the commissioning. The first results obtained with the test bench for beams up to 16 MeV are shown here. We demonstrate that the chosen instrumentation achieves a very high sensitivity, dynamic range, reliability and immunity to EM noise. Procedures for on-line calibration of the instruments are also discussed.

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WEPAK004

Beam Instrumentation for CRYRING@ESR

injection, instrumentation, hardware, detector

2084

A. Reiter, C. Andre, H. Bräuning, C. Dorn, P. Forck, R. Haseitl, T. Hoffmann, W. Kaufmann, N. Kotovski, P. Kowina, K. Lang, R. Lonsing, P.B. Miedzik, T. Milosic, A. Petit, H. Reeg, C. Schmidt, M. Schwickert, T. Sieber, R. Singh, G. Vorobjev, B. Walasek-Höhne, M. Witthaus
GSI, Darmstadt, Germany

We present the beam instrumentation of CRYRING@ESR, a low-energy experiment facility at the GSI Helmholtz-Centre for heavy ion research. The 1.44 Tm synchrotron and storage ring, formerly hosted at the Manne Siegbahn laboratory in Stockholm, Sweden, was modified in its configuration and installed behind the existing ESR, the experimental storage ring. As the first machine within the ongoing FAIR project, the facility for antiproton and ion research, it is built on the future timing system and frameworks for data supply and acquisition. Throughout the past year CRYRING was commissioned including its electron cooler with hydrogen beams from the local linear accelerator. Storage, acceleration and cooling have been demonstrated. The contribution provides an overview of the beam instrumentation. The design of the detector systems and their current performance are presented. Emphasis is given to beam position monitors, detectors for intensity measurements, and the ionization profile monitors.

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WEPMF004

The Saclay Test Stand for Conditioning the ESS RFQ Power Couplers at High RF Power

cavity, vacuum, linac, interface

2375

N. Misiara, A.C. Chauveau, D. Chirpaz-Cerbat, P. Daniel-Thomas, M. Lacroix, L. Maurice
CEA/IRFU, Gif-sur-Yvette, France
M. Desmons, A. Dubois, A. Gaget, L. Napoly, M. Oublaid, G. Perreu, O. Piquet, B. Pottin, Y. Sauce
CEA/DRF/IRFU, Gif-sur-Yvette, France

The RF power coupler system for the RFQ of the ESS LINAC will feed 1.6 MW peak power through two coaxial loop couplers for a 352.21 MHz operation at the expected duty cycle. A specific test stand has been designed to condition the power couplers, and test the different auxiliary components in the nominal conditions of the RFQ. The power couplers were successfully assembled, installed and instrumented on the test cavity. This paper presents the general layout of the test stand, the installation and preparation of the power couplers for their conditioning at high RF power up to the ESS nominal conditions.

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THXGBE1

6D Beam Measurement, Challenges and Possibilities

simulation, experiment, quadrupole, linac

2890

A.V. Aleksandrov, S.M. Cousineau, A.P. Zhukov
ORNL, Oak Ridge, Tennessee, USA
B.L. Cathey
ORNL RAD, Oak Ridge, Tennessee, USA

A system to measure the full 6D beam parameters (not 3x2D) has been built at the SNS RFQ test stand. Such a measurement will allow detailed analysis of the beam physics from a properly measured input term. This invited provides an overview of the principles and design of this system, and reports on status and results.

Slides THXGBE1 [4.471 MB]

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THXGBF2

Beam Commissioning of the IFMIF EVEDA Very High Power RFQ

cavity, MMI, vacuum, operation

2902

E. Fagotti, L. Antoniazzi, L. Bellan, D. Bortolato, M. Comunian, A. Facco, M.G. Giacchini, F. Grespan, M. Montis, A. Palmieri, A. Pisent, F. Scantamburlo
INFN/LNL, Legnaro (PD), Italy
B. Bolzon, N. Chauvin, R. Gobin
CEA/IRFU, Gif-sur-Yvette, France
P. Cara
IFMIF/EVEDA, Rokkasho, Japan
H. Dzitko, D. Gex, A. Jokinen, G. Phillips
F4E, Germany
T. Ebisawa, A. Kasugai, K. Kondo, K. Sakamoto, T. Shinya, M. Sugimoto
QST, Aomori, Japan
R. Heidinger, A. Marqueta, I. Moya
Fusion for Energy, Garching, Germany
P. Mereu
INFN-Torino, Torino, Italy
G. Pruneri
Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova, Italy
M. Weber
CIEMAT, Madrid, Spain

IFMIF, the International Fusion Materials Irradiation Facility, is an accelerator-based neutron source that will use Li(d, xn) reactions to generate a flux of neutrons with a broad peak at 14 MeV equivalent to the conditions of the Deuterium-Tritium reactions in a fusion power plant. IFMIF is conceived for fusion materials testing. The IFMIF prototype linear accelerator (LIPAc) is jointly developed by Europe and Japan within the IFMIF EVEDA project: it is composed of an ion source, a LEBT, an RFQ, a MEBT and a SC linac, with a final energy of 9 MeV. The 4-vane Radio Frequency Quadrupole (RFQ), developed by INFN in Italy, will accelerate a 130 mA deuteron beam from 0.1 to 5 MeV in continuous wave, for a beam power of 650 kW. The 9.8 m long 175 MHz cavity is composed of 18 x 0.54 m long modules flanged together and aligned within 0.3 mm tolerance. The RFQ was completed, delivered and assembled at the Rokkasho site and is presently under extended RF tests. The second phase of beam commissioning (up to 2.5 MeV/u) was scheduled to start at the end of 2017. Several unexpected issues and incidents significantly delayed the original program, which is however proceeding step by step toward the full achievement of its goals.

Slides THXGBF2 [5.318 MB]

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THYGBF2

PIP-II Injector Test Warm Front End: Commissioning Update

kicker, operation, emittance, focusing

2943

L.R. Prost, R. Andrews, C.M. Baffes, J.-P. Carneiro, B.E. Chase, A.Z. Chen, E. Cullerton, P. Derwent, J.P. Edelen, J. Einstein-Curtis, D. Frolov, B.M. Hanna, D.W. Peterson, G.W. Saewert, A. Saini, V.E. Scarpine, A.V. Shemyakin, V.L. Sista, J. Steimel, D. Sun, A. Warner
Fermilab, Batavia, Illinois, USA
C.J. Richard
NSCL, East Lansing, Michigan, USA
V.L. Sista
BARC, Mumbai, India

Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics
The Warm Front End (WFE) of the Proton Improvement Plan II Injector Test [1] at Fermilab has been constructed to its full length. It includes a 15-mA DC, 30-keV H⁻ ion source, a 2 m-long Low Energy Beam Transport (LEBT) with a switching dipole magnet, a 2.1 MeV CW RFQ, followed by a Medium Energy Beam Transport (MEBT) with various diagnostics and a dump. This report presents the commissioning status, focusing on beam measurements in the MEBT. In particular, a beam with the parameters required for injection into the Booster (5 mA, 0.55 ms macro-pulse at 20 Hz) was transported through the WFE.

Slides THYGBF2 [2.434 MB]

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THPAF082

Frequency Jump at Low Energies

linac, emittance, bunching, simulation

3176

C. Zhang
GSI, Darmstadt, Germany
H. Podlech
IAP, Frankfurt am Main, Germany

One or more radio-frequency jumps are usually necessary for realizing a ≥100 AMeV/u proton or ion driver linac. Typically, such jumps happen in the range of β = 0.2-0.6 between the resonator structures fitting to this β-range, e.g. DTL, HWR, CCL or elliptical cavities. We propose to perform the first frequency jump already at low energies (β ≤ 0.1) between two RFQ accelerators, which can bring some unique advantages. First studies have been performed and the results proved that this idea is feasible and promising. Many efforts have been and are being made to address the most critical issue for the jumps i.e. the beam matching at the transition.

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THPAK018

Recent Developments in DEMIRCI for RFQ Design

software, simulation, multipole, cavity

3243

E. Celebi
IBU, Istanbul, Turkey
O. Cakir, G. Turemen
Ankara University, Faculty of Sciences, Ankara, Turkey
G. Turemen
TAEK, Ankara, Turkey
G. Unel
UCI, Irvine, California, USA

Funding: This project has been supported by TUBITAK with project number 114F10⁶ and 117F143.
DEMIRCI software aims to aid RFQ design efforts by making the process easy, fast and accurate. In this report, DEMIRCI 8-term potential results are compared with the results provided by other commercially available simulation software. Computed electric fields are compared to the re- sults from simulations of a recently produced 352 MHz RFQ. Recent developments like the inclusion of space charge ef- fects in DEMIRCI beam dynamics are also discussed. More- over, further terms are added to 8-term potential to simulate possible vane production errors. The FEM solver was also improved to mesh the cells with errors.

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THPAK019

Beam Dynamics of the First Beams for IFMIF-EVEDA RFQ Commissioning

proton, extraction, emittance, solenoid

3246

L. Bellan, C. Baltador, M. Comunian, E. Fagotti, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
T. Akagi
KEK, Ibaraki, Japan
B. Bolzon, N. Chauvin
CEA/DSM/IRFU, France
H. Dzitko
F4E, Germany
K. Kondo, M. Sugimoto
QST, Aomori, Japan
I. Podadera
CIEMAT, Madrid, Spain
F. Scantamburlo
IFMIF/EVEDA, Rokkasho, Japan

The installation of the IFMIF-EVEDA RFQ, MEBT, LEBT, source and beam dump was completed in September 2017. The beam dynamics of the first beams for the IFMIF-EVEDA RFQ commissioning is presented. Moreover, a proposal for the CW RFQ steady state commissioning is shown, with a focus on the beam dynamics challenges of the beam transport after the RFQ.

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THPAK022

Beam Dynamic Simulation for the Beam Line from Charge Breeder to ALPI for SPES Project

simulation, linac, experiment, quadrupole

3255

M. Comunian, L. Bellan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
A.V. Ziiatdinova
ITEP, Moscow, Russia
A.V. Ziiatdinova
MEPhI, Moscow, Russia

The SPES project (Selective Production of Exotic Species) is under development at INFN-LNL. This facility is intended for production of neutron-rich Radioactive Ion Beams (RIBs) by ISOL method. The +1 charged beam will be transformed to n+ charge by Charge Breeder (Electron Cyclotron resonance ion source) and reaccelerated by the ALPI (Acceleratore Lineare Per Ioni) superconducting Linac . This paper includes results of beam dynamic simulation at the beam line from Charge Breeder to ALPI.

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THPAK075

Simulation of Particle Interactions in a High Intensity Radio-Frequency Quadrupole for Molecular Hydrogen Ions

proton, simulation, electron, acceleration

3405

M.J. Easton, H.P. Li, Y.R. Lu, Z. Wang
PKU, Beijing, People's Republic of China
J. Qiang
LBNL, Berkeley, California, USA

High-intensity deuteron accelerators run the risk of deuteron-deuteron interactions leading to activation. For this reason, in the commissioning phase, a molecular hydrogen ion (H²⁺) beam is often used as a model for the deuteron beam without the radiation risk. However, composite ions are susceptible to particle interactions that do not affect single ions, such as stripping of electrons and charge exchange. Such interactions affect the beam dynamics results, and may lead to production of secondary particles, which in high-intensity beams may cause damage to the accelerator and reduce the quality of the beam. In order to understand these effects, we have modified the IMPACT-T particle tracking code to include particle interactions during the tracking simulation through a high-intensity continuous-wave (CW) radio-frequency quadrupole (RFQ). This code is also designed to be easily extensible to other interactions, such as collisions or break-up of heavier ions. Preliminary results and possibilities for future development will be discussed.

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THPAK076

Development and Benchmarking of the IMPACT-T Code

linac, SRF, simulation, space-charge

3408

H.P. Li, M.J. Easton, Y.R. Lu, Z. Wang
PKU, Beijing, People's Republic of China
J. Qiang
LBNL, Berkeley, California, USA

The multi-particle tracking code IMPACT-T is widely used to calculate the particle motion in high intensity linacs. The code is a self-consistent three-dimensional beam dynamics simulation toolbox that utilizes the particle-in-cell method in the time domain. In the collaboration between PKU and LBNL, an RFQ module was implemented to the IMPACT-T code, which enables simulations of the accelerator front-end. In order to benchmark the newly developed module in the IMPACT-T code, we have simulated the beam transport in Beijing Isotope Separation On-Line (BISOL) high intensity deuteron driver linac. It consists of a 3 MeV RFQ and 40 MeV superconducting HWR linac with five cryomodules. After comparing the simulation results with PARMTEQM, TraceWin and Toutatis, we obtained a very good agreement, which represents the validation of the new code.

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THPAK112

Toward an End-to-End Model for ISAC-I Accelerators

ISAC, linac, simulation, TRIUMF

3500

O. Shelbaya, O.K. Kester
TRIUMF, Vancouver, Canada

Diurnal-like transmission variations in the ISAC-I warm accelerator system necessitates periodic retuning by operators. While beam loss points are well known, re-tuning nevertheless results in additional downtime and reduced count rates at experiments. This has motivated the development of an end-to-end simulation of the ISAC-I linear accelerator (linac) system to understand and characterize the nature of transmission instabilities spanning several hours to days.

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THPAL002

RF System Operation of High Current RFQ in ADS Project

cavity, operation, coupling, LLRF

3613

L.P. Sun, R. Huang, C.X. Li, L. Lu, A. Shi, L.B. Shi, W.B. Wang, X.B. Xu, H.W. Zhao
IMP/CAS, Lanzhou, People's Republic of China
Y. Hu
TUB, Beijing, People's Republic of China

Funding: Work supported by Natural Science Foundation of China， No.11505253
New RF system has been upgraded several times for high-current operation, especially for extra beam power and detuning angle. The current was increased gradually resulting in more and more frequency detuning, and an effective method is to tune the temperature of cavity to compromise detuning. Of course, the power dissipated in cavity and high intensity beam are approximately 120kW resulting in too many power modules operated in the high risk of failure. The specific analysis and simulation were introduced in detail.

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THPAL007

Upgrade of PIAVE Superconducting RFQs at INFN-Legnaro

SRF, operation, cavity, superconducting-RF

3623

G. Bisoffi, E. Bissiato, D. Bortolato, F. Chiurlotto, T. Contran, E. Fagotti, A. Minarello, P. Modanese, E. Munaron, D. Scarpa
INFN/LNL, Legnaro (PD), Italy
V. Andreev
ITEP, Moscow, Russia
A. Bosotti, R. Paparella
INFN/LASA, Segrate (MI), Italy
L.M.A. Ferreira
CERN, Geneva, Switzerland
K. Kasprzak
IFJ-PAN, Kraków, Poland
R.C. Pardo
ANL, Argonne, Illinois, USA

Superconducting RFQs (SRFQs), the first SC RFQs ever made operational for users, have been operated on the PIAVE SC heavy ion linac injector at INFN-Legnaro since 2006. The structure is split into two resonators and is limited to the accelerating RFQ sections. The resonators had never exceeded 80% of the design accelerating fields. In 2015, an upgrade plan started, aimed at increasing the accelerating fields, while improving their slow and fast tuning systems, repairing degraded components, imple-menting a LASER alignment method. The upgrade plan was successfully concluded in summer 2017. The resona-tors were kept stably locked for days at a field larger than the nominal one. Eventually, a test beam was accelerated successfully for 72 hours, with negligible locking issues. SRFQs entered once again routine operation in December 2017. The new features will allow to accelerate heavy ions with an A/q value as high as 8.5 (versus a former maximum A/q=7.5), allowing operation of the very first accelerated uranium beams at INFN-LNL, after the relat-ed authorizations shall have been issued.

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THPAL008

A RFQ Cooler Development

ion-source, emittance, quadrupole, injection

3627

M. Cavenago, L. Bellan, M. Comunian, M. Maggiore, L. Pranovi
INFN/LNL, Legnaro (PD), Italy
G. Maero, N. Panzeri, M. Romé
Universita' degli Studi di Milano e INFN, Milano, Italy

Funding: INFN group 5 (exp. PLASMA4BEAM)
The cooling of beams of exotic nuclei (both in energy spread and in transverse oscillations) is critical to downstream mass spectrometry devices and can be provided by collisions with light gases as in the Radio Frequency Quadrupole Cooler (RFQC). As in other traps, several electromagnetic systems can be used for beam deceleration confinement and deceleration, as a radiofrequency (rf) quadrupole, a magnetic solenoid and electrostatic acceleration. Since rf contributes both to beam cooling and heating, operational parameters should be carefully optimized. The LNL RFQC prototype is going to be placed inside the existing Eltrap solenoid, capable of providing a magnetic flux density component B_z up to 0.2 T, where z is the solenoid axis. Setup progress and related rf component development are reported; in particular simple matching boxes are discussed; the differential gas pumping system is also described.

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THPAL112

RF Matching Circuit for CANREB RFQ

TRIUMF, network, simulation, pick-up

3902

T. Au, B. Barquest, J.J. Keir, V. Zvyagintsev
TRIUMF, Vancouver, Canada

A RF matching circuit has been developed to provide two phase RF voltage of 1.2 kVpp at 3 MHz and 6 MHz for the CANREB RFQ structure with an equivalent capacitive load of 300 pF. The RF matching circuit utilizes pi-network with two phase transformer. Beyond RF drive the CANREB structure requires pulse DC bias with amplitude up to 500 V. Results of development and testing of RF matching circuit and filters are presented in this paper.

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THPAL116

Development and Installation of the CANREB RFQ Buncher at TRIUMF

bunching, TRIUMF, operation, emittance

3914

B. Barquest, F. Ames, T. Au, L. Graham, M.R. Pearson, V. Zvyagintsev
TRIUMF, Vancouver, Canada
J. Bale, J. Dilling, R. Kruecken, Y. Lan
UBC & TRIUMF, Vancouver, British Columbia, Canada
G. Gwinner
University of Manitoba, Manitoba, Canada
N. Janzen, R.A. Simpson
UW/Physics, Waterloo, Ontario, Canada
R. Kanungo
Saint Mary's University, Halifax, Canada

Funding: TRIUMF receives federal funding via the National Research Council of Canada. CANREB is funded by the Canada Foundation for Innovation (CFI), the Provinces NS, MB and TRIUMF.
Pure, intense rare isotope beams at a wide range of energies are crucial to the nuclear science programs at TRIUMF. The CANREB project will deliver a high resolution spectrometer (HRS) for beam purification, and a charge breeding system consisting of a radiofrequency quadrupole (RFQ) beam cooler and buncher, an electron beam ion source (EBIS), and a Nier-type spectrometer to prepare the beam for post-acceleration. Bunching the beam prior to charge breeding will significantly enhance the efficiency of the EBIS. The RFQ buncher will accept continuous §I{60}{keV} rare isotope beams from the ARIEL or ISAC production targets and efficiently deliver low emittance bunched beams. A pulsed drift tube (PDT) will adjust the energy of the bunched beam for injection into the EBIS to match the acceptance of the post-accelerating RFQ. Ion optical simulations were carried out to inform the design of the RFQ buncher and PDT. Simulations indicate that delivery of up to 10⁷~ions per bunch with high efficiency is possible. Experience with previous beam bunchers was also brought to bear in the design effort. Installation of the RFQ is under way, and tests with offline beam are expected to be performed in late 2018.

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THPAL122

Beam Performance Study of an RF Structure to Accelerate or Bunch Low Energy Ion Beams

booster, space-charge, ISAC, bunching

3931

S.D. Rädel, S. Kiy, R.E. Laxdal, O. Shelbaya
TRIUMF, Vancouver, Canada

The 35.4MHz Radio Frequency Quadrupole (RFQ) at the ISAC-I facility at TRIUMF is designed to accelerate ions from an energy of 2.04 keV/u to 150 keV/u for a large range of mass-to-charge ratios (A/Q). A multi-harmonic, 11.8MHz, buncher is used to provide a time focus at the RFQ entrance. Due to limits in the ion source HV platform a boost in the energy is required for higher mass beams (20 ≤ A/Q ≤ 30) to provide energy matching into the RFQ. To achieve this, a 3-gap, 11.8 MHz RF booster has been installed into the ISAC-I facility downstream of the buncher and upstream of the RFQ. The device can operate as an accelerator to match into the RFQ or as a second pre-buncher to improve capture in the RFQ and reduce sensitivity to space charge. Proof-of-principle measurements demonstrating various aspects of the performance will be reported and compared against expectations.

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THPML059

Re-Commissioning the Front End Test Stand Negative Hydrogen Ion Source, Beam Transport and Interlocks

ion-source, vacuum, MMI, high-voltage

4769

S.R. Lawrie, R.E. Abel, M. Dudman, D.C. Faircloth, A.P. Letchford, J.H. Macgregor, M. Perkins, T. M. Sarmento, R.C. Searle, M. Whitehead, T. Wood
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The front end test stand (FETS) is a demonstrator for a future high intensity, high duty factor negative hydrogen (H') ion injector. With the radio-frequency quadrupole (RFQ) nearing installation, the ion source has been re-commissioned in preparation for long-term operation. The 3 MeV beam exceeds the radio-activation energy of common engineering materials, so radiation shielding has been erected. A new interlocking scheme has been signed-off which integrates the existing ion source high voltage area with the new shielding access points, to ensure that the machine can operate safely during beam production. The existing vacuum arrangement has been extended to in-clude the RFQ and medium energy beam transport (MEBT) line. A new programmable logic controller (PLC) has been built to operate the entire vacuum chain. The ion source high voltage equipment has been upgraded to minimise both spark rate and intensity. A collimating aperture and Faraday cup have been installed after the low energy beam transport (LEBT) section to ensure the beam is well aligned for injection into the RFQ. Re-commissioning the ion source has given a rugged shakedown of all these new systems before beam is required for the RFQ.
*scott.lawrie@stfc.ac.uk

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THPML119

A Time-of-Flight Based Energy Measurement System for the LIGHT Medical Accelerator

MMI, proton, cavity, linac

4951

F. Galizzi
University of Bergamo, Bergamo, Italy
M. Caldara, F. Galizzi, A. Jeff
A.D.A.M. SA, Meyrin, Switzerland

The LIGHT proton therapy facility is the first compact Linac that will deliver proton beams up to 230 MeV for cancer treatment. The proton beam is pulsed; pulses repetition rate can reach 200 Hz. LIGHT prototype is currently being commissioned by AVO/ADAM at CERN, while the first full installation is foreseen in 2019. Beam energy translates directly to range penetration in the body, so it is of the utmost importance to monitor it accurately especially for Linacs, since each beam pulse is directly transported to the patient. We present the implementation of a non-interceptive beam energy measurement system based on the Time-of-Flight technique. Unlike state of the art ToF systems this one has been designed to measure autonomously the mean energy of the beam with medical resolution (0.03 %) by processing as little as 1 us of data providing the result within 1 to 2 ms over an energy range from 5 to 230 MeV. The first results for beams up to 7.5 MeV are shown.

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FRXGBD3

Application of Carbon Nanotube Wire for Beam Profile Measurement of Negative Hydrogen Ion Beam

electron, operation, linac, beam-loading

5022

A. Miura, K. Moriya
JAEA/J-PARC, Tokai-mura, Japan
T. Miyao
KEK, Ibaraki, Japan

A wire scanner monitor using metallic wire is reliably employed for the beam profile measurement in the J-PARC linac. Because the loading of negative hydrogen (H⁻) ion beam on a wire increases under high-current beam operation, we focus on using a high-durability beam profile monitors by attaching another wire material. Carbon nanotubes (CNT) are made of graphite in a cylindrical shape and have a tensile strength not less than 100 times that of steel. The electric conductivity has higher than that of metals, and hardness is endured thermally around 3000°C in a vacuum circumstance. We applied the CNT wires to WSM and measured transverse profiles with a 3-MeV and 191-MeV H⁻ beam. As a result, we obtained the equivalent signal levels taken by carbon wire made of polyacrylonitrile without any damage. In this paper, the signal response when the CNT is irradiated with an H⁻ beam and the result of beam profile measurement. In addition, the surface of CNT after 3-MeV beam operation was observed.

Slides FRXGBD3 [2.558 MB]

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FRXGBF1

Re-Acceleration of Ultra Cold Muon in J-PARC Muon Facility

linac, experiment, acceleration, emittance

5041

Y. Kondo, K. Hasegawa, T. Morishita
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
S. Bae, H. Choi, S. Choi, B. Kim, H.S. Ko
SNU, Seoul, Republic of Korea
Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, M. Otani, K. Shimomura, T. Yamazaki, M. Yoshida
KEK, Tsukuba, Japan
N. Hayashizaki
RLNR, Tokyo, Japan
T. Iijima, Y. Sue
Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
H. Iinuma, Y. Nakazawa
Ibaraki University, Ibaraki, Japan
K. Ishida
RIKEN Nishina Center, Wako, Japan
Y. Iwashita
Kyoto ICR, Uji, Kyoto, Japan
Y. Iwata
NIRS, Chiba-shi, Japan
R. Kitamura
University of Tokyo, Tokyo, Japan
S. Li
The University of Tokyo, Graduate School of Science, Tokyo, Japan
G.P. Razuvaev
Budker INP & NSU, Novosibirsk, Russia
N. Saito
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Funding: This work is supported by JSPS KAKENHI Grant Numbers JP15H03666, JP16H03987, and JP16J07784.
J-PARC is developing the reacceleration system of the ultra slow (30 meV) muon (USM) obtained by two-photon laser resonant ionization of muonium atoms. The muon beam thus obtained has low emittance, meeting the requirement for the g-2/EDM experiment. J-PARC E34 experiment aims to measure the muon anomalous magnetic moment (g-2) with a precision of 0.1 ppm and search for EDM with a sensitivity to 10^-21 e cm. The USM's are accelerated to 212 MeV by using a muon dedicated linac to be a ultra cold muon beam. The muon LINAC consists of an RFQ, a inter-digital H-mode DTL, disk and washer coupled cell structures, and disk loaded structures. The ultra-cold muons will have an extremely small transverse momentum spread of 0.1% with a normalized transverse emittance of around 1.5 pi mm-mrad. Proof of the slow muon acceleration scheme is an essential step to realize the world first muon linac. In October 2017, we have succeeded to accelerate slow negative muoniums generated using a simpler muonium source to 89 keV. In this talk, present design of the muon linac and the result of the world first muon acceleration experiment are reported.

Slides FRXGBF1 [8.373 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-FRXGBF1

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