Keyword: ion-source
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MO1P02 Approaches to High Power Operation of J-PARC Accelerator linac, operation, rfq, cavity 29
 
  • H. Oguri
    JAEA/J-PARC, Tokai-mura, Japan
 
  Japan Proton Accelerator Research Complex (J-PARC) accelerators have been having over 10 years of operation experience. In 2006, the J-PARC linac started beam operation with an energy of 181 MeV. To realize the nominal performance of 1 MW at 3 GeV Rapid Cycling Synchrotron (RCS) and 0.75 MW at a 30 GeV Main Ring synchrotron (MR), the linac energy was upgrade to 400 MeV by adding an annular-ring coupled structure linac, and the beam current was also upgraded from 30 to 50 mA by replacing a new ion source and an RFQ. After the upgrade, the RCS demonstrated 1MW equivalent beam operation and currently operates 400 kW for the Material and Life Science Facility. The MR beam power is increasing and becomes about 480 kW beam to the Neutrino Facility and about 50 kW at the Hadron Experimental Facility. Further upgrade plan of 1.5 MW beam power from the RCS is now in consideration. To achieve the plan, it is necessary to increase by about 20 % both beam current and pulse length at the linac. The detail process in the past upgrade and the possibility for further upgrade at the linac will be presented in this talk.  
slides icon Slides MO1P02 [5.595 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1P02  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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MO1P03 Status of the ESS Linac linac, cavity, controls, target 35
 
  • A. Sunesson, P. Arnold, S.L. Birch, R. Garoby, M. Jensen, M. Lindroos, C.A. Martins, A. Nordt, T.J. Shea, J.G. Weisend
    ESS, Lund, Sweden
 
  The European Spallation Source under construction in Lund (Sweden) uses a 2 GeV-5MW pulsed superconducting linac as proton driver. Normal conducting accelerating structures are used up to 92 MeV and superconducting structures up to 2 GeV. Most linac components are designed and procured as in-kind contributions by institutes/laboratories in the European partner countries. Installation of the Ion source delivered by INFN-Catania started end 2017. Installation of more components and infrastructure progresses at a high pace. Commissioning of the normal conducting linac section will take place in parallel with installation of the superconducting section. Beam commissioning of the superconducting section will be done starting in 2021, interlaced with the installation of additional high beta cryomodules. Beam will be sent to the target in 2022, initially at an energy of 1.3 GeV. Start of the User Programme is scheduled in 2023, when some neutron instruments will be ready and end of construction is in 2025, with the full set of instruments operational. This paper reports the status of linac components construction, the progress with installation on site, and the overall project schedule.  
slides icon Slides MO1P03 [14.161 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MO1P03  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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MOPO100 Doubly Stripped Proton Causing Vacuum Leak at Brookhaven 200 MeV H linac Complex proton, linac, rfq, dipole 214
 
  • D. Raparia, G. Atoian, T. Lehn, V. LoDestro, M. Mapes, A. McNerney, J. Ritter, A. Zelenski
    BNL, Upton, Long Island, New York, USA
 
  Doubly stripped H in the low energy beam transport are capture 180 degree apart in the RF of RFQ and accelerated to the full energies. These protons are bend in the opposite direction of H after the 200 MeV drift tube linac and caused vacuum leak. A new beam dump for these stripped protons is planned  
poster icon Poster MOPO100 [4.781 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO100  
About • paper received ※ 11 September 2018      issue date ※ 18 January 2019  
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TUPO011 Upgrade of Heavy Ion Injector I-3 at ITEP acceleration, heavy-ion, emittance, laser 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      issue date ※ 18 January 2019  
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TUPO012 Compact Multipurpors Facility - BELA rfq, linac, neutron, ECR 349
 
  • T. Kulevoy, R. Fatkullin, A.V. Kozlov, G. Kropachev, D.N. Selesnev, A.I. Semennikov, A. Sitnikov
    ITEP, Moscow, Russia
  • T. Kulevoy
    NRC, Moscow, Russia
  • T. Kulevoy
    MEPhI, Moscow, Russia
 
  In ITEP the project of multidiscipline facility Based on ECR ion source and Linear Accelerator (BELA) is started. The injector part of facility is based on combinations of ECR ion source and dc H+ and He+ source will provide the multi beams irradiation of the reactor materials for modeling experiments. The cw RFQ and following DTL will enable the set of experimental activity both for fun-damental physics and for practical applications.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO012  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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TUPO083 Beam Dynamics for the FAIR p-Linac Ladder RFQ rfq, linac, emittance, simulation 522
 
  • M. Syha, U. Ratzinger, M. Schuett
    IAP, Frankfurt am Main, Germany
 
  After the successful measurements with a 0.8 m prototype a 3.3 m Ladder-RFQ is under construction at IAP, Goethe University Frankfurt. It is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the p-Linac at FAIR. Along the acceleration section modulation parameter, aperture and synchronous phase all course (quasi-)linear, which differentiates this design approach from other designs developed at IAP. The ratio of transversal vane curvature radius to mid-cell radial aperture as well as the vane radius itself are constant, which favors a flat voltage distribution along the RFQ. This was verified by implantation of the modulated vane geometry into MWS-CST RF field simulations. The development of adequate beam dynamics was done in close collaboration with the IAP resonator design team. The Los Alamos RFQGen-code was used for the RFQ design and the beam dynamics simulations.  
poster icon Poster TUPO083 [0.932 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO083  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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THPO039 The Status of CSNS Front End rfq, emittance, MMI, operation 771
 
  • H. Li, X. Cao, W. Chen, T. Huang, S. Liu, K. Xue
    CSNS, Guangdong Province, People’s Republic of China
  • S. Fu, Y.J. Lv, H.F. Ouyang, Y.C. Xiao
    IHEP, Beijing, People’s Republic of China
 
  CSNS front end is currently under running, which consists of a H penning ion source(IS), a low energy beam transport(LEBT), a radio frequency quadrupole (RFQ) and a medium energy beam transport(MEBT). CSNS ion source is a type of Penning surface plasma source, similar to ISIS ion source. Cesium is used to enhance the H ion production efficiency. The ion source is running with duty factor of 1.25%(25Hz and 500us). Normally, 40mA H beam from ion source with 50keV can be delivered into LEBT. Three solenoids and two direction magnets are employed to transport and match the beam from the ion source into the RFQ. The pre-chopper is installed at the end of LEBT. The chopper mainly works at 3.8-4.2 kV and 1 MHz rate, which is about the RF frequency of the ring at injection. The rise time is less than 10ns,which fulfills the requirement of ring injection. For the RFQ, it is a 324MHz 4-vane type with a output energy of 3.0MeV and the length of 3.62m. The input cavity power is about 400kW. During commissioning, 16mA H beam can be obtained at the exit of RFQ, and the RFQ transmission rate is up to 94%.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO039  
About • paper received ※ 03 September 2018      issue date ※ 18 January 2019  
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THPO043 ESS Normal Conducting Linac Status and Plans rfq, DTL, linac, proton 781
 
  • E. Sargsyan, H. Danared, F. Hellström, G. Hulla, Ø. Midttun, J.S. Schmidt
    ESS, Lund, Sweden
  • I. Bustinduy, N. Garmendia, J.L. Muñoz
    ESS Bilbao, Zamudio, Spain
  • L. Celona, S. Gammino, L. Neri
    INFN/LNS, Catania, Italy
  • A.C. Chauveau, B. Pottin
    CEA/IRFU, Gif-sur-Yvette, France
  • F. Grespan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • P. Mereu
    INFN-Torino, Torino, Italy
 
  The European Spallation Source (ESS) uses a linear accelerator to deliver the high intensity proton beam to the target station for producing intense beams of neutrons. The average beam power is 5 MW with a peak beam power at the target of 125 MW. The normal conducting linear accelerator (linac) operating at 352.21 MHz accelerates a proton beam of 62.5 mA from 0.075 to 90 MeV. It consists of an ion source, Low Energy Beam Transport (LEBT), Radio Frequency Quadrupole (RFQ), Medium Energy Beam Transport (MEBT), and Drift Tube Linac (DTL). The design, construction and testing of those structures is done by European partner labs as an in-kind contribution to the ESS project. This paper presents the status and plans for the ESS normal conducting linac.
E.Sargsyan for the ESS NC Linac collaboration team
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO043  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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THPO126 Compact H+ ECR Ion Source with Pulse Gas Valve plasma, ECR, extraction, GUI 955
 
  • Y. Takeuchi, Y. Iwashita, H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
 
  We are developing a compact ECR H+ ion source with pulse gas valve. In the case of high current ion linac, the distance between the ion source and the first accelerating tube such as RFQ must be as short as possible to reduce the space charge effect, while operating in a high electric field a good vacuum condition is desirable. Since hydrogen gas always flows out from ion sources if the plasma chamber is filled with the gas, vacuum pumping systems have to evacuate the gas enough before the first accelerating tube. The pulse gas injection system achieved by a fast piezo gas valve can reduce the gas load on the vacuum evacuation system and is suitable for installing the ion source close to the RFQ.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO126  
About • paper received ※ 19 September 2018      issue date ※ 18 January 2019  
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