LINAC2018 - List of Keywords (acceleration)

Paper	Title	Other Keywords	Page
TU2A01	First Acceleration of Heavy Ion Beams with a Superconducting Continuous Wave HIM/GSI CW-linac	cavity, linac, heavy-ion, emittance	297
	W.A. Barth, K. Aulenbacher, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu HIM, Mainz, Germany K. Aulenbacher IKP, Mainz, Germany W.A. Barth, M. Heilmann, A. Rubin, A. Schnase, S. Yaramyshev GSI, Darmstadt, Germany M. Basten, M. Busch, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany
	First acceleration of heavy ion beams with a superconducting continuous wave HIM/GSI CW-Linac After successful RF-testing of a new superconducting Linac RF-cavity at GSI Helmholtzzentrum für Schwerionenforschung and a short commissioning and ramp up time of some days, this 15-gaps Crossbar H-cavity accelerated first time heavy ion beams with full transmission up to the design beam energy. The design acceleration gain of 3.5 MV inside a length of less than 70 cm has been verified with heavy ion beam of up to 1.5 particle mkA. The measured beam parameters show a nice beam quality. The machine commissioning with beam is a milestone of the R&D work of Helmholtz Institute Mainz and GSI in collaboration with Goethe University Frankfurt in development of the superconducting heavy ion continuous wave linear accelerator CW-Linac.
	Slides TU2A01 [3.385 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TU2A01
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO001	About the Limits for the Accelerated Beam Current in the LUE-200 Linac of the IREN Facility	klystron, linac, electron, neutron	320
	A.P. Sumbaev JINR, Dubna, Moscow Region, Russia A.M. Barnyakov, A.E. Levichev BINP SB RAS, Novosibirsk, Russia
	The beam current loading of the accelerating fields is discussed for the linear accelerator LUE-200 of IREN facility. LUE-200 electron Linac consits of two disk loaded travelling wave accelerating structure with the operating frequency of 2856 MHz and power compression SLED-type system. The limits by the accelerated beam current are defined for different pulse durations of the beam current and RF power. The calculated results are discussed and compared with the measurements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO001
About •	paper received ※ 12 September 2018 paper accepted ※ 22 January 2019 issue date ※ 18 January 2019
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TUPO005	Initial Beam Commissioning of LEAF at IMP	rfq, emittance, MMI, ECR	332
	Y. Yang, W.P. Dou, X. Fang, Y.H. Guo, H. Jia, L. Jing, X.J. Liu, L. Lu, W. Lu, W. Ma, L.T. Sun, L.P. Sun, W. Wei, H.W. Zhao, Y.H. Zhai IMP/CAS, Lanzhou, People’s Republic of China
	A Low Energy intense-highly-charged ion Accelerator Facility (LEAF), which mainly includes an ECR ion source, LEBT and an 81.25 MHz RFQ, was designed to produce and accelerate heavy ions, from helium to uranium with A/Q between 2 and 7, to the energy of 0.5 MeV/u. The typical beam intensity is designed up to 2 emA CW for the uranium beam. The facility has been successfully commissioned with He⁺ (A/Q=4) and N2+ (A/Q=7) beams and accelerated the beams in the CW regime to the designed energy of 0.5 MeV/u. Beam properties and transmission efficiencies were measured, indicating a good consistency with simulated data. After having briefly recalled the project scope and parameters, this paper describes the beam commissioning strategy and detailed commissioning results.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO005
About •	paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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TUPO010	Muon Acceleration Test with the RFQ Towards the Development of the Muon Linac	experiment, rfq, simulation, diagnostics	342
	R. Kitamura University of Tokyo, Tokyo, Japan S. Bae, S. Choi, B. Kim SNU, Seoul, Republic of Korea Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, T. Yamazaki KEK, Tsukuba, Japan K. Hasegawa, Y. Kondo, T. Morishita JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan T. Iijima, Y. Sue Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan H. Iinuma, Y. Nakazawa Ibaraki University, Hitachi, Ibaraki, Japan K. Ishida RIKEN Nishina Center, Wako, Japan S. Li The University of Tokyo, Graduate School of Science, Tokyo, Japan M. Otani, N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan G.P. Razuvaev Budker INP & NSU, Novosibirsk, Russia
	The muon linac to accelerate muons 212 MeV is planned in order to measure the muon dipole moments precisely in the J-PARC. The muon acceleration with a RF accelerator hasn’t been demonstrated yet in the world. Therefore the muon acceleration test with the RFQ as the feasibility test of the muon linac was demonstrated at the Muon D line in the J-PARC MLF. Conventional muons are cooled with producing ultra-slow muons using the muonium production and the ionization laser for the muon linac. However these apparatuses couldn’t be used because of the limitation of the experimental area in the acceleration test. Therefore the conventional muon was converted to the negative muonium ion (Mu-) with less than 2 keV using the thin aluminum foil target as the easy cooling method. The Mu- was finally accelerated to 90 keV using the RFQ. The accelerated Mu- was selected with a diagnostic beam line and identified with the Time-Of-Flight measurement using a MCP detector. The result of the world’s first muon acceleration test with the RFQ will be reported in this presentation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO010
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO011	Upgrade of Heavy Ion Injector I-3 at ITEP	heavy-ion, emittance, laser, bunching	346
	N.N. Alexeev, P.N. Alekseev, V. Andreev, T. Kulevoy, A.D. Milyachenko, V.I. Nikolaev, Yu.A. Satov, A. Shumshurov, A. Zarubin ITEP, Moscow, Russia
	Heavy ion injector I-3 represents two-gap 2.5 MHz resonator with accelerating voltage 2x2 MV. It‘s used with laser ion source for acceleration of heavy ions in wide range of charge to mass ratio. As a result of modernization, injector structure will be supplemented by the second two-gap resonator, rf voltage will be increased to 3x4 MV and accelerated beam structure has to be improved by increasing accelerating frequency to 5 MHz. Design features of upgraded linac and peculiarity of beam dynamics for different types of ions are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO011
About •	paper received ※ 03 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TUPO112	Calculation of Electron Beam Dynamics in Four Accelerating Stations for JINR Linear Electron Accelerator LINAC-200	electron, linac, solenoid, detector	566
	A. Sledneva, V. Aleksandrov, V.V. Kobets JINR, Dubna, Moscow Region, Russia
	In the Joint Institute for Nuclear Research a Test Stand with an electron beam generated by the linear accelerator LINAC-200 with the energy up to 200 MeV is being constructed to investigate properties of accelerating and semiconducting structures for advanced detectors, a radiation resistance of detectors based on gallium arsenide semiconductor, to study a free electron laser and to do other applied for work. The technical characteristics of the LINAC-200 accelerator make it possible to create an advanced system of test beams for scientific and methodological studies of detectors on its basis. Four accelerating stations with maximum beam energy up to 200 MeV are put into operation. The work is being carried out for experiments with electron test beams with energy up to 800 MeV. This work presents the calculation results of the magnetic field of the focusing solenoidal system and electron beam dynamics in accelerating stations. In addition, the results on the formation of the electron beam with optimal parameters to be captured in further accelerating sections.
	Poster TUPO112 [1.176 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO112
About •	paper received ※ 12 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019
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TH1A03	High Brightness Electron Beams from Plasma-based Acceleration	plasma, electron, FEL, simulation	637
	A. Marocchino, A. Biagioni, E. Brentegani, E. Chiadroni, M. Ferrario, F. Filippi, A. Giribono, R. Pompili, A.R. Rossi INFN/LNF, Frascati (Roma), Italy A. Bacci Istituto Nazionale di Fisica Nucleare, Milano, Italy A. Cianchi Università di Roma II Tor Vergata, Roma, Italy V. Petrillo Universita’ degli Studi di Milano, Milano, Italy
	Funding: INFN-CNAF and CINECA for high performance computing resources. European Union Horizon 2020 programme N. 53782. Plasma Wakefield acceleration is a promising new acceleration techniques that profit by a charged bunch, e.g. an electron bunch, to break the neutrality of a plasma channel to produce a wake where a trailing bunch is eventually accelerated. The quest to achieve extreme gradient conserving high brightness has prompted to a variety of new approaches and techniques. Most of the proposed schemes are however limited to the only plasma channel, assuming in the vast majority of cases, ideal scenarios (e.g. ideal bi-gaussian bunches and uniform density plasma channels). Realistic start-to-end simulations, from the photo-cathode to FEL via a high gradient, emittance and energy spread preserving plasma section, are mandatory for paving the way towards plasma-based user facilities.
	Slides TH1A03 [25.814 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1A03
About •	paper received ※ 11 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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TH1A04	The Proton Driven Advanced Wake Field Acceleration Experiment (AWAKE) at CERN	plasma, proton, electron, wakefield	642
	S. Döbert CERN, Geneva, Switzerland
	The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wake field generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment at CERN and the world’s first proton driven plasma wake field acceleration experiment. The experiment uses the 400 GeV proton beam from the SPS which travels through a 10 m long Rb-vapour plasma cell where it gets self-modulated and generates the plasma wake fields. Eventually an electron beam is injected externally to probe the wake-fields. AWAKE will has completed several experimental campaigns starting in 2016. Results from the initial characterization of the plasma cell and measurements of the seeded self-modulation of the proton beam will be presented. Experiments to accelerate externally injected electrons using the proton driven plasma wake fields will start in 2018 and first results will be reported.
	Slides TH1A04 [4.787 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1A04
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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TH1P02	Injection Complex Development for the NICA-project at JINR	rfq, linac, booster, injection	663
	A.V. Butenko, B.V. Golovenskiy, A. Govorov, A.D. Kovalenko, V.A. Monchinsky, A.V. Smirnov, G.V. Trubnikov JINR, Dubna, Moscow Region, Russia D.E. Donets, K.A. Levterov, D.A. Lyuosev, A.A. Martynov, V.V. Mialkovskiy, D.O. Ponkin, K.V. Shevchenko, I.V. Shirikov, A.O. Sidorin JINR/VBLHEP, Dubna, Moscow region, Russia H. Höltermann, H. Podlech, U. Ratzinger, A. Schempp BEVATECH, Frankfurt, Germany T. Kulevoy ITEP, Moscow, Russia S.M. Polozov MEPhI, Moscow, Russia
	The new accelerator complex Nuclotron-based Ion Collider fAcility (NICA) is still under construction at JINR, Dubna. Two Linacs should serve as injectors for this new accelerator complex. LU-20 as an Alvarez based lLinac for light polarized ions and the new Heavy Ion Linear Accelerator HILAC dedicated to heavy ion beam operation. Main results of the HILAC commissioning with carbon beam from the laser ion source should be discussed. Besides a new R&D-project is ongoing to developed superconducting cavities for a new light ion linear injector which created to upgrade the injector complex. The current status of linac design and results of the beam dynamics simulations and SRF technology developments should be presented as well.
	Slides TH1P02 [8.162 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1P02
About •	paper received ※ 17 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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THPO012	Once Recirculating Energy Recovery Linac Operation of S-DALINAC*	linac, operation, simulation, recirculation	710
	M. Arnold, J. Birkhan, J. Pforr, N. Pietralla, F. Schließmann, M. Steinhorst TU Darmstadt, Darmstadt, Germany F. Hug KPH, Mainz, Germany
	Funding: *Work supported by DFG through GRK 2128 and INST163/383-1/FUGG Since 1991 the superconducting S-DALINAC is running in recirculating operation. It was built in a twice recirculating layout. A third recirculation beam line was added in 2015/2016 as an upgrade. The new recirculation beam line is installed in-between the two existing beam lines. It houses a path length adjustment system capable of changing the length of the orbit for recirculation by up to 10 cm corresponding to the RF wave length at the operation frequency of 3 GHz and consequently to a freedom of RF phase adjustment by 360°. The new beam line can, thus, be utilized for an accelerating operation or, if the change in phase is set to 180°, for an energy recovery linac (ERL) operation. In August 2017 the S-DALINAC was first operated in once recirculating ERL mode and became the first running ERL in Germany. Different aspects of this ERL run have been observed and were evaluated. The layout of the S-DALINAC allows a once or twice recirculating ERL mode. Beam dynamics simulations for both modes have been conducted or are currently under investigation. This contribution will discuss the once recirculating ERL operation, its results, and future plans concerning ERL measurements.
	Poster THPO012 [0.708 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO012
About •	paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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THPO016	Investigation of 2D PBG Waveguides for THz Driven Acceleration	GUI, impedance, photon, electron	714
	A. Vint, R. Letizia Cockcroft Institute, Lancaster University, Lancaster, United Kingdom R. Letizia Lancaster University, Lancaster, United Kingdom
	Funding: Work supported by the STFC PhD Studentship Novel accelerating techniques that overcome the limitations of conventional RF technology are receiving significant interest. Moving from RF to the THz frequency range, higher gradient of acceleration of high energy beams can be achieved in miniaturised structures. Moreover, with respect to the optical frequency range, the THz regime allows for larger structures and better beam quality to be obtained. In this paper, we investigate the use of a 2D photonic bandgap (PBG) waveguide for THz driven electron acceleration. In accelerator applications, the properties of PBG waveguides can be exploited to damp higher order modes and offer low-loss dielectric confinement at high frequency. In particular, 2D PBG waveguides offer a good compromise between manufacturability, total photonic bandgap confinement, and ease of parallel illumination. The structure here proposed is optimised for maximum bandgap and single mode operation. Dispersion characteristics of the accelerating mode are studied to achieve the best compromise between high accelerating field and effective accelerating bandwidth, given a ~10% bandwidth of the THz driving pulse.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO016
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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THPO020	Dynamic Behavior of Electron Beam under Rf Field and Static Magnetic Field in Cyclotron Auto-resonance Accelerator	electron, SRF, GUI, resonance	725
	Y.T. Yuan HUST, Wuhan, People’s Republic of China K. Fan Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People’s Republic of China Y. Jiang Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA
	Funding: the National Natural Science Foundation of China The cyclotron auto-resonance accelerator (CARA) is a novel concept of accelerating continuous gyrating charged-particle beams to moderately or highly relativistic energies, which can be used as the high power microwave source and applied in environment improvement area, particularly in the flue gas pollution remediation. In CARA, the continuous-wave (CW) electron beam follows a gyrating trajectory while undergoing the interaction with the rotating TE-mode rf field and tapered static magnetic field. In the process of gyrating acceleration, the phase synchronization with the rf field is automatically maintained, so to speak, with auto-resonance. Simulation models are constructed to study the effect of rf field and static magnetic field on electron beam in CARA, where the beam energy, trajectory and velocity component are analysed. The simulation results match reasonably well with theoretical predication, which sets up a solid foundation for future designs of CARA.
	Poster THPO020 [1.448 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO020
About •	paper received ※ 11 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019
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THPO048	Low Power Measurement of a 1300-MHz RFQ Cold Model	rfq, linac, emittance, experiment	794
	Y. Kondo, T. Morishita, J. Tamura JAEA/J-PARC, Tokai-mura, Japan M. Otani KEK, Ibaraki, Japan
	Funding: This work is supported by JSPS KAKENHI Grant Number 17K18784. A muon linac development for a new muon g-2/EDM experiment is now going on at J-PARC. Muons from the muon beam line (H-line) of the J-PARC muon facility are once stopped in a silica aerojel target and room temperature muoniums are evaporated from the aerogel. They are dissociated with the lasers to be the ultra slow muons, then accelerated up to 212 MeV using a linear accelerator. The low energy part of this muon linac consists of a 324-MHz RFQ and an IH DTL. The frequency is increased to 1296 MHz at the following CCL section. We propose to replace the low energy section to a 1300-MHz RFQ to simplify the configuration of the muon linac. The 1300-MHz RFQ will be extremely small compared to conventional RFQs, therefore we made a cold model to proof the feasibility of this scheme. In this paper, the result of low-power measurement of the 1300-MHz RFQ cold model is described.
	Slides THPO048 [2.160 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO048
About •	paper received ※ 12 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019
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THPO052	High Power Test of the LEAF-RFQ	rfq, quadrupole, operation, cavity	808
	L. Lu, Y. He, W. Ma, L.B. Shi, L.T. Sun, L.P. Sun, L. Yang, Y. Yang, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China
	High power heavy ion drivers require a CW low-frequency accelerator for initial acceleration. A CW four-vane radio frequency quadrupole (RFQ) accelerator is designed to accelerate heavy ions A/q up to 7 from 14 keV/u to 500 keV/u, as a new injector for the Low Energy Accelerator Facility (LEAF) at Institute of Modern Physics (IMP). The measurements of low power test were reported previously. In this paper, the results of high power test of the RFQ, including the test of the acceleration systems and beam profiles, will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO052
About •	paper received ※ 07 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019
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THPO127	The Effect of Energy Fluctuation on the Multi-bunch Acceleration in E-driven ILC Positron Source	positron, beam-loading, cavity, booster	958
	M. Kuriki, H. Nagoshi HU/AdSM, Higashi-Hiroshima, Japan S. Kashiwagi Tohoku University, Research Center for Electron Photon Science, Sendai, Japan K. Negishi Iwate University, Morioka, Iwate, Japan T. Okugi, T. Omori, M. Satoh, Y. Seimiya, J. Urakawa, K. Yokoya KEK, Ibaraki, Japan Y. Sumitomo LEBRA, Funabashi, Japan T. Takahashi Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan
	E-Driven method is a technical backup for positron source for ILC. In the positron source, the positron is generated and accelerated in a multi-bunch format with gaps in a macro-pulse. We employ AM (Amplitude Modulation) to suppress the transient beam-loading, but a small fluctuation is still expected, depending on the compensation accuracy. In this article, the positron yield which is ratio of numbers of positrons over electrons, is evaluated as a function of the compensation accuracy. With this result and the detail investigation of the beam loading compensation accuracy by AM, the positron yield of E-Driven Positron source for ILC is evaluated.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO127
About •	paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019
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Paper

Title

Other Keywords

Page

TU2A01

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

cavity, linac, heavy-ion, emittance

297

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

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

Slides TU2A01 [3.385 MB]

DOI •

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

About •

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

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TUPO001

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

klystron, linac, electron, neutron

320

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

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

DOI •

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

About •

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

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TUPO005

Initial Beam Commissioning of LEAF at IMP

rfq, emittance, MMI, ECR

332

Y. Yang, W.P. Dou, X. Fang, Y.H. Guo, H. Jia, L. Jing, X.J. Liu, L. Lu, W. Lu, W. Ma, L.T. Sun, L.P. Sun, W. Wei, H.W. Zhao, Y.H. Zhai
IMP/CAS, Lanzhou, People’s Republic of China

A Low Energy intense-highly-charged ion Accelerator Facility (LEAF), which mainly includes an ECR ion source, LEBT and an 81.25 MHz RFQ, was designed to produce and accelerate heavy ions, from helium to uranium with A/Q between 2 and 7, to the energy of 0.5 MeV/u. The typical beam intensity is designed up to 2 emA CW for the uranium beam. The facility has been successfully commissioned with He⁺ (A/Q=4) and N2+ (A/Q=7) beams and accelerated the beams in the CW regime to the designed energy of 0.5 MeV/u. Beam properties and transmission efficiencies were measured, indicating a good consistency with simulated data. After having briefly recalled the project scope and parameters, this paper describes the beam commissioning strategy and detailed commissioning results.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO005

About •

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

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TUPO010

Muon Acceleration Test with the RFQ Towards the Development of the Muon Linac

experiment, rfq, simulation, diagnostics

342

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

The muon linac to accelerate muons 212 MeV is planned in order to measure the muon dipole moments precisely in the J-PARC. The muon acceleration with a RF accelerator hasn’t been demonstrated yet in the world. Therefore the muon acceleration test with the RFQ as the feasibility test of the muon linac was demonstrated at the Muon D line in the J-PARC MLF. Conventional muons are cooled with producing ultra-slow muons using the muonium production and the ionization laser for the muon linac. However these apparatuses couldn’t be used because of the limitation of the experimental area in the acceleration test. Therefore the conventional muon was converted to the negative muonium ion (Mu-) with less than 2 keV using the thin aluminum foil target as the easy cooling method. The Mu- was finally accelerated to 90 keV using the RFQ. The accelerated Mu- was selected with a diagnostic beam line and identified with the Time-Of-Flight measurement using a MCP detector. The result of the world’s first muon acceleration test with the RFQ will be reported in this presentation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO010

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

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TUPO011

Upgrade of Heavy Ion Injector I-3 at ITEP

heavy-ion, emittance, laser, bunching

346

N.N. Alexeev, P.N. Alekseev, V. Andreev, T. Kulevoy, A.D. Milyachenko, V.I. Nikolaev, Yu.A. Satov, A. Shumshurov, A. Zarubin
ITEP, Moscow, Russia

Heavy ion injector I-3 represents two-gap 2.5 MHz resonator with accelerating voltage 2x2 MV. It‘s used with laser ion source for acceleration of heavy ions in wide range of charge to mass ratio. As a result of modernization, injector structure will be supplemented by the second two-gap resonator, rf voltage will be increased to 3x4 MV and accelerated beam structure has to be improved by increasing accelerating frequency to 5 MHz. Design features of upgraded linac and peculiarity of beam dynamics for different types of ions are presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO011

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paper received ※ 03 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019

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TUPO112

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

electron, linac, solenoid, detector

566

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

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

Poster TUPO112 [1.176 MB]

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

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

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TH1A03

High Brightness Electron Beams from Plasma-based Acceleration

plasma, electron, FEL, simulation

637

A. Marocchino, A. Biagioni, E. Brentegani, E. Chiadroni, M. Ferrario, F. Filippi, A. Giribono, R. Pompili, A.R. Rossi
INFN/LNF, Frascati (Roma), Italy
A. Bacci
Istituto Nazionale di Fisica Nucleare, Milano, Italy
A. Cianchi
Università di Roma II Tor Vergata, Roma, Italy
V. Petrillo
Universita’ degli Studi di Milano, Milano, Italy

Funding: INFN-CNAF and CINECA for high performance computing resources. European Union Horizon 2020 programme N. 53782.
Plasma Wakefield acceleration is a promising new acceleration techniques that profit by a charged bunch, e.g. an electron bunch, to break the neutrality of a plasma channel to produce a wake where a trailing bunch is eventually accelerated. The quest to achieve extreme gradient conserving high brightness has prompted to a variety of new approaches and techniques. Most of the proposed schemes are however limited to the only plasma channel, assuming in the vast majority of cases, ideal scenarios (e.g. ideal bi-gaussian bunches and uniform density plasma channels). Realistic start-to-end simulations, from the photo-cathode to FEL via a high gradient, emittance and energy spread preserving plasma section, are mandatory for paving the way towards plasma-based user facilities.

Slides TH1A03 [25.814 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1A03

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

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TH1A04

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

plasma, proton, electron, wakefield

642

S. Döbert
CERN, Geneva, Switzerland

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

Slides TH1A04 [4.787 MB]

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

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

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TH1P02

Injection Complex Development for the NICA-project at JINR

rfq, linac, booster, injection

663

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

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

Slides TH1P02 [8.162 MB]

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

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

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THPO012

Once Recirculating Energy Recovery Linac Operation of S-DALINAC*

linac, operation, simulation, recirculation

710

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

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

Poster THPO012 [0.708 MB]

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

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

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THPO016

Investigation of 2D PBG Waveguides for THz Driven Acceleration

GUI, impedance, photon, electron

714

A. Vint, R. Letizia
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
R. Letizia
Lancaster University, Lancaster, United Kingdom

Funding: Work supported by the STFC PhD Studentship
Novel accelerating techniques that overcome the limitations of conventional RF technology are receiving significant interest. Moving from RF to the THz frequency range, higher gradient of acceleration of high energy beams can be achieved in miniaturised structures. Moreover, with respect to the optical frequency range, the THz regime allows for larger structures and better beam quality to be obtained. In this paper, we investigate the use of a 2D photonic bandgap (PBG) waveguide for THz driven electron acceleration. In accelerator applications, the properties of PBG waveguides can be exploited to damp higher order modes and offer low-loss dielectric confinement at high frequency. In particular, 2D PBG waveguides offer a good compromise between manufacturability, total photonic bandgap confinement, and ease of parallel illumination. The structure here proposed is optimised for maximum bandgap and single mode operation. Dispersion characteristics of the accelerating mode are studied to achieve the best compromise between high accelerating field and effective accelerating bandwidth, given a ~10% bandwidth of the THz driving pulse.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO016

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

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THPO020

Dynamic Behavior of Electron Beam under Rf Field and Static Magnetic Field in Cyclotron Auto-resonance Accelerator

electron, SRF, GUI, resonance

725

Y.T. Yuan
HUST, Wuhan, People’s Republic of China
K. Fan
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People’s Republic of China
Y. Jiang
Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA

Funding: the National Natural Science Foundation of China
The cyclotron auto-resonance accelerator (CARA) is a novel concept of accelerating continuous gyrating charged-particle beams to moderately or highly relativistic energies, which can be used as the high power microwave source and applied in environment improvement area, particularly in the flue gas pollution remediation. In CARA, the continuous-wave (CW) electron beam follows a gyrating trajectory while undergoing the interaction with the rotating TE-mode rf field and tapered static magnetic field. In the process of gyrating acceleration, the phase synchronization with the rf field is automatically maintained, so to speak, with auto-resonance. Simulation models are constructed to study the effect of rf field and static magnetic field on electron beam in CARA, where the beam energy, trajectory and velocity component are analysed. The simulation results match reasonably well with theoretical predication, which sets up a solid foundation for future designs of CARA.

Poster THPO020 [1.448 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO020

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

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THPO048

Low Power Measurement of a 1300-MHz RFQ Cold Model

rfq, linac, emittance, experiment

794

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

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

Slides THPO048 [2.160 MB]

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

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

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THPO052

High Power Test of the LEAF-RFQ

rfq, quadrupole, operation, cavity

808

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

High power heavy ion drivers require a CW low-frequency accelerator for initial acceleration. A CW four-vane radio frequency quadrupole (RFQ) accelerator is designed to accelerate heavy ions A/q up to 7 from 14 keV/u to 500 keV/u, as a new injector for the Low Energy Accelerator Facility (LEAF) at Institute of Modern Physics (IMP). The measurements of low power test were reported previously. In this paper, the results of high power test of the RFQ, including the test of the acceleration systems and beam profiles, will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO052

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paper received ※ 07 September 2018 paper accepted ※ 08 October 2018 issue date ※ 18 January 2019

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THPO127

The Effect of Energy Fluctuation on the Multi-bunch Acceleration in E-driven ILC Positron Source

positron, beam-loading, cavity, booster

958

M. Kuriki, H. Nagoshi
HU/AdSM, Higashi-Hiroshima, Japan
S. Kashiwagi
Tohoku University, Research Center for Electron Photon Science, Sendai, Japan
K. Negishi
Iwate University, Morioka, Iwate, Japan
T. Okugi, T. Omori, M. Satoh, Y. Seimiya, J. Urakawa, K. Yokoya
KEK, Ibaraki, Japan
Y. Sumitomo
LEBRA, Funabashi, Japan
T. Takahashi
Hiroshima University, Graduate School of Science, Higashi-Hiroshima, Japan

E-Driven method is a technical backup for positron source for ILC. In the positron source, the positron is generated and accelerated in a multi-bunch format with gaps in a macro-pulse. We employ AM (Amplitude Modulation) to suppress the transient beam-loading, but a small fluctuation is still expected, depending on the compensation accuracy. In this article, the positron yield which is ratio of numbers of positrons over electrons, is evaluated as a function of the compensation accuracy. With this result and the detail investigation of the beam loading compensation accuracy by AM, the positron yield of E-Driven Positron source for ILC is evaluated.

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reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO127

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

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