Keyword: gun
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MOCOXBS03 Status of Novosibirsk ERL FEL, electron, radiation, operation 5
 
  • N.A. Vinokurov
    BINP SB RAS, Novosibirsk, Russia
 
  The Novosibirsk ERL is dedicated electron beam source for three free electron lasers operating in the wavelength range 8 - 240 micron at average power up to 0.5 kW and peak power about 1 MW. Radiation users works at 8 user stations performing biological, chemical, physical and medical research. The Novosibirsk ERL is the first and the only four-turn ERL in the world. Its peculiar features include the normal-conductive 180 MHz accelerating system, the DC electron gun with the grid thermionic cathode, three operation modes of the magnetic system, and a rather compact (6×40 m2) design. The facility has been operating for users of terahertz radiation since 2004. The status of the installation and plans are described.  
slides icon Slides MOCOXBS03 [6.521 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-MOCOXBS03  
About • paper received ※ 13 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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MOCOXBS04 The Berlin Energy Recovery Linac Project BERLinPro - Status, Plans and Future Opportunities cavity, linac, operation, cathode 8
 
  • M. Abo-Bakr, N. Al-Saokal, W. Anders, Y. Bergmann, K. Bürkmann-Gehrlein, A. Bundels, A.B. Büchel, P. Echevarria, A. Frahm, H.-W. Glock, F. Glöckner, F. Göbel, S. Heling, J.G. Hwang, A. Jankowiak, C. Kalus, T. Kamps, G. Klemz, J. Knobloch, J. Kolbe, J. Kühn, B.C. Kuske, J. Kuszynski, A.N. Matveenko, M. McAteer, A. Meseck, S. Mistry, R. Müller, A. Neumann, N. Ohm, K. Ott, F. Pflocksch, L. Pichl, J. Rahn, O. Schüler, M. Schuster, Y. Tamashevich, J. Ullrich, A. Ushakov, J. Völker
    HZB, Berlin, Germany
  • H. Huck
    DESY Zeuthen, Zeuthen, Germany
 
  Funding: Work supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association
The Helmholtz-Zentrum Berlin is constructing the Energy Recovery Linac Prototype BERLinPro, a SRF based demonstration facility for the science and technology of ERLs for future high power, high brilliance electron beam applications. BERLinPro was designed to accelerate a high current (100 mA, 50 MeV), high brilliance (norm. emittance below 1 mm mrad) cw electron beam. Given the recent prioritization of the BESSY II upgrade to the BESSY VSR variable pulse length storage ring, HZB is forced to reduce the project goals of BERLinPro. As a result, the project had to be rescoped with the goal to maximize its scientific impact within the present boundary conditions. We report on the last year’s progress of the building, the warm and cold infrastructure and on the time line, goals nd opportunities for the remaining project run time.
 
slides icon Slides MOCOXBS04 [13.980 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-MOCOXBS04  
About • paper received ※ 16 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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WECOXBS02 High Current Performance of Alkali Antimonide Photocathode in LEReC DC Gun cathode, operation, electron, synchrotron 61
 
  • M. Gaowei, J. Cen, A.V. Fedotov, D. Kayran, D. Lehn, C.J. Liaw, T. Rao, J.E. Tuozzolo, J. Walsh, E. Wang
    BNL, Upton, New York, USA
 
  The bi-alkali antimonide photocathode are chosen as the electron source material for the Low Energy RHIC electron Cooling (LEReC) project at RHIC, BNL based on its requirement for high bunch charge and long-time beam operation. This report presents the design and operation of the cathode deposition and transportation systems for the LEReC photocathodes, the cathode performance under the high current operation in the LEReC DC gun, as well as the characterization of the damaged cathodes from the long-time operation.  
slides icon Slides WECOXBS02 [2.804 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WECOXBS02  
About • paper received ※ 17 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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WECOXBS03 Bench Test Results of CW 100 mA Electron RF Gun for Novosibirsk ERL based FEL cathode, cavity, radiation, electron 65
 
  • V. Volkov, V.S. Arbuzov, E. Kenzhebulatov, E.I. Kolobanov, A.A. Kondakov, E.V. Kozyrev, S.A. Krutikhin, I.V. Kuptsov, G.Y. Kurkin, S.V. Motygin, A.A. Murasev, V.K. Ovchar, V.M. Petrov, A.M. Pilan, V.V. Repkov, M.A. Scheglov, I.K. Sedlyarov, S.S. Serednyakov, O.A. Shevchenko, S.V. Tararyshkin, A.G. Tribendis, N.A. Vinokurov
    BINP SB RAS, Novosibirsk, Russia
  • E.V. Kozyrev, S.S. Serednyakov, N.A. Vinokurov
    NSU, Novosibirsk, Russia
  • A.G. Tribendis
    NSTU, Novosibirsk, Russia
  • N.A. Vinokurov
    KAERI, Daejon, Republic of Korea
  • N.A. Vinokurov
    UST, Daejeon City, Republic of Korea
  • N.A. Vinokurov
    University of Science and Technology of Korea (UST), Daejeon, Republic of Korea
 
  Continuous wave (CW) 100 mA electron rf gun for injecting the high-quality 300-400 keV electron beam in Novosibirsk Energy Recovery Linac (ERL) and driving Free Electron Laser (FEL) was developed, built, and commissioned at BINP SB RAS. The RF gun consists of normal conducting 90 MHz rf cavity with a gridded thermionic cathode unit. Bench tests of rf gun is confirmed good results in strict accordance with our numerical calculations and showed reliable work, unpretentious for vacuum conditions and stable in long-term operation. The design features of different components of the rf gun are presented. Preparation and commissioning experience is discussed. The latest beam results are reported.  
slides icon Slides WECOXBS03 [3.201 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WECOXBS03  
About • paper received ※ 14 September 2019       paper accepted ※ 11 November 2019       issue date ※ 24 June 2020  
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WEPNEC01 Status and Future Perspective of the TRIUMF E-Linac linac, electron, radiation, MMI 70
 
  • S.D. Rädel, M. Alcorta, F. Ames, E. Chapman, K. Fong, B. Humphries, O.K. Kester, D. Kishi, S.R. Koscielniak, R.E. Laxdal, Y. Ma, T. Planche, M. Rowe, V.A. Verzilov
    TRIUMF, Vancouver, Canada
 
  The currently installed configuration of TRIUMF’s superconducting electron linac (e-linac) can produce an electron beam up to 30MeV and 10mA. Low beam power commissioning of the segment spanning the electron gun to high energy dump took place in summer 2018 with an attained beam energy of 25MeV. As the driver of the ARIEL project, the e-linac will deliver electrons to a photo-converter target station for the production of neutron-rich rare isotope beams (RIB) via photo fission. The e-linac will have sufficient beam power to support the demands of other user community rare isotope beams. This driver accelerator could server as a production machine for high field THz radiation and as irradiation center. A recirculation of the beam would be beneficial for RIB production at higher beam energy and would allow for high bunch compression to generate THz radiation. Such a system would also allow for the investigation of a high beam intensity energy recovery linac. To this end, TRIUMF is investigating the design of such a recirculation and the beam dynamics as a first step.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC01  
About • paper received ※ 01 October 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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WEPNEC13 Preliminary Investigations and Pre-Research Scheme of High Average Current Electron Injectors at IMP electron, cathode, high-voltage, SRF 90
 
  • Q.T. Zhao, J.C. Yang, Z.M. Zhang, H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
 
  High average current electron injectors are desired by high average beam power SRF linacs. With respect to the different linac application, different beam qualities are required. Two kinds of electron gun are planned for future projects at IMP, one is thermionic electron gun dedicated for high average current, and another one is photocathode gun which is for high average current and high beam quality or even with high polarization. Current status and development of the high average current electron source are investigated and summarized. The thermionic gun studies are planned and the feasible types of gun for the future Electron ion collider of China (EicC) project are also proposed. The pre-research scheme of these two kinds of electron guns are schemed, which will be the start of high average current and high-quality electron source development at Institute of modern physics (IMP), Chinese academy of sciences (CAS).  
poster icon Poster WEPNEC13 [0.827 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC13  
About • paper received ※ 22 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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WEPNEC19 Optimisation of the PERLE Injector booster, emittance, electron, cavity 107
 
  • B. Hounsell, M. Klein, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • B. Hounsell, B.L. Militsyn, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • B. Hounsell, W. Kaabi
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • B.L. Militsyn
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  The injector for PERLE, a proposed electron Energy Recovery Linac (ERL) test facility for the LHeC and FCC-eh projects, is intended to deliver 500 pC bunches at a repetition rate of 40.1 MHz for a total beam current of 20 mA. These bunches must have a bunch length of 3 mm rms and an energy of 7 MeV at the entrance to the first linac pass while simultaneously achieving a transverse emittance of less than 6 mm mrad. The injector is based around a DC photocathode electron gun, followed by a focusing and normal conducting bunching section, a booster with 5 independently controllable SRF cavities and a merger into the main ERL. A design for this injector from the photocathode to the exit of the booster is presented. This design was simulated using ASTRA for the beam dynamics simulations and optimized using the many objective optimization algorithm NSGAIII. The use of NSGAIII allows more than three beam parameters to be optimised simultaneously and the trade-offs between them to be explored.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC19  
About • paper received ※ 01 October 2019       paper accepted ※ 11 November 2019       issue date ※ 24 June 2020  
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WECOYBS04 Commissioning of theBERLinPro Diagnostics Line using Machine Learning Techniques booster, MMI, diagnostics, laser 123
 
  • B.C. Kuske
    HZB, Berlin, Germany
  • A. Adelmann
    PSI, Villigen PSI, Switzerland
 
  Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association
BERLinPro is an Energy Recovery Linac (ERL) project currently being set up at HZB, Berlin. Commissioning is planned for early 2020. HZB triggered and supported the development of release 2.0 of the particle tracking code OPAL, that is now also applicable to ERLs. OPAL is set up as an open source, highly parallel tracking code for large accelerator systems and many particles. Thus, it is idially suited to serve attempts of applying machine learning approaches to beam dynamics, as demonstrated in [1]. OPAL is used to calculate hundreds of randomized machines close to the commissioning optics of BERLinPro. This data base will be used to train a neural network, to establish a surrogate model of BERLinPro, much faster than any physical model including particle tracking. First steps, like the setup of the sampler and a sensitivity analysis of the resulting data are presented. The ultimate goal of this work is to use machine learning techniques during the commissioning of BERLinPro. Future steps are outlined. [1] A. Edelen, A. Adelmann, N. Neveu, Y. Huber, M. Frey, ’Machine Learning to enable orders of magnitude speedup in multi-objective optimization of particle accelerator systems’
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WECOYBS04  
About • paper received ※ 30 October 2019       paper accepted ※ 07 November 2019       issue date ※ 24 June 2020  
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THCOYBS01 Metal and Semiconductor Photocathodes in HZDR SRF Gun cathode, SRF, laser, cavity 142
 
  • R. Xiang, A. Arnold, P. Murcek, J. Schaber, J. Teichert
    HZDR, Dresden, Germany
  • J. Schaber
    TU Dresden, Dresden, Germany
 
  Funding: The work is supported by the German Federal Ministry of Education and Research (BMBF) grant 05K12CR1.
Quality of photocathode in a photoinjector is one of the critical issues for the stability and reliability of the whole accelerator facility. In April 2013, the IR FEL lasing was demonstrated for the first time with the electron beam from the SRF gun with Cs2Te at HZDR. Cs2Te photocathode worked in SRF gun-I for more than one year without degradation. Currently, Mg photocathodes with QE up to 0.5% are applied in SRF Gun-II, generating e- beam with bunch charge up to 300 pC in CW mode with sub-ps bunch length for the high power THz radiation. It is an excellent demonstration that SRF guns can work reliably in a high power user facility.
 
slides icon Slides THCOYBS01 [3.868 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-THCOYBS01  
About • paper received ※ 18 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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THCOYBS02 High Charge High Current Beam From BNL 113 MHz SRF Gun cathode, cavity, laser, electron 145
 
  • I. Pinayev, I. Ben-Zvi, J.C. Brutus, M. Gaowei, T. Hayes, Y.C. Jing, V. Litvinenko, J. Ma, K. Mihara, G. Narayan, I. Petrushina, F. Severino, K. Shih, J. Skaritka, E. Wang, G. Wang, Y.H. Wu
    BNL, Upton, New York, USA
  • V. Litvinenko
    Stony Brook University, Stony Brook, USA
  • I. Petrushina, Y.H. Wu
    SUNY SB, Stony Brook, New York, USA
  • K. Shih
    SBU, Stony Brook, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The 113 MHz superconducting gun is used an electron source for the coherent electron cooling experiment. The unique feature of the gun is that a photocathode is held at room temperature. It allowed to preserve the quantum efficiency of Cs2KSb cathode which is adversely affected by cryogenic temperatures. Relatively low frequency permitted fully realize the accelerating field gradient what in turn helps to achieve 10 nC charge and 0.3 microns normalized emittance. We present the achieved performance and operational experience as well.
 
slides icon Slides THCOYBS02 [4.350 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-THCOYBS02  
About • paper received ※ 03 September 2019       paper accepted ※ 08 July 2020       issue date ※ 24 June 2020  
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FRCOXBS05 Adjusting BERLinPro Optics to Commissioning Needs linac, optics, cathode, bunching 165
 
  • B.C. Kuske, M. McAteer
    HZB, Berlin, Germany
 
  Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association
BERLinPro is an Energy Recovery Linac (ERL) project currently being set up at HZB, Berlin. During the turn of the project, many adaptations of the optics to changing hardware realities were necessary. To name only one, commissioning of the recirculator will now be realized with the superconducting linac module fabricated for the Mainz ERL project MESA, as the BERLinPro linac is delayed. The Mainz linac will supply roughly 60% of the energy planned for the BERLinPro linac module and will be limited by higher order modes in the cavities to few mA of current. While the adapted optics shows similar parameters as the original 50MeV optics, studies of longitudinal space charge and coherent synchrotron radiation show that the energy leads to large emittance blow up due toμbunching. Furthermore, preparations for commissioning with gun fields much lower than the original 30MV/m in the 1.4 cell SRF gun are introduced and according optics are presented.
 
slides icon Slides FRCOXBS05 [9.766 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-FRCOXBS05  
About • paper received ※ 19 September 2019       paper accepted ※ 04 November 2019       issue date ※ 24 June 2020  
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FRCOYBS01 Working Group Summary: ERL Facilities linac, operation, FEL, electron 171
 
  • M. Abo-Bakr
    HZB, Berlin, Germany
  • M. Arnold
    TU Darmstadt, Darmstadt, Germany
 
  To be added.  
slides icon Slides FRCOYBS01 [4.193 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-FRCOYBS01  
About • paper received ※ 20 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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