THCOZBS —  WG3: Electron sources and injectors   (19-Sep-19   16:00—18:00)
Chair: D. Kayran, BNL, Upton, New York, USA
Paper Title Page
THCOZBS01
 Novosibirsk ERL injector  
 
  • O.A. Shevchenko, V.S. Arbuzov, K.N. Chernov, I.V. Davidyuk, O.I. Deichuli, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, S.A. Krutikhin, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, A.S. Matveev, L.E. Medvedev, S.V. Motygin, V.N. Osipov, V.K. Ovchar, V.M. Petrov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, S.S. Serednyakov, A.N. Skrinsky, S.V. Tararyshkin, V.G. Tcheskidov, A.G. Tribendis, N.A. Vinokurov, V. Volkov
    BINP SB RAS, Novosibirsk, Russia
  • I.V. Davidyuk, Ya.V. Getmanov, E.V. Kozyrev, S.S. Serednyakov, N.A. Vinokurov
    NSU, Novosibirsk, Russia
  • A.G. Tribendis
    NSTU, Novosibirsk, Russia
  
  The Novosibirsk ERL is the first in the world multi-orbit ERL with high average current. It is used as a source of electron bunches for three powerful FEL-oscillators which operate in CW mode. In present configuration the ERL Injector comprises a 300-kV electrostatic gun with thermionic cathode, as well as one bunching and two accelerating cavities separated by the drift space which is used for bunch compression. In near future the new RF gun will be added to this configuration. The basic requirement for the injector is to provide beam parameters necessary for FEL operation. These parameters include bunch charge more than 1 nQ and repetition rate about 10 MHz. Very small emittance and very short pulse duration are not required in our case because of long FEL radiation wavelength and low RF frequency of the main linac. We present detailed description of the injector setup and results of beam parameters measurements. The measured parameters are compared with simulation results. We also discuss future upgrade which includes installation of the new RF gun.  
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THCOZBS02
 Status of SRF Gun for BERLinPro  
 
  • A. Neumann, N. Al-Saokal, D. Böhlick, A.B. Büchel, M. Bürger, P. Echevarria, A. Frahm, H.-W. Glock, F. Göbel, S. Heling, K. Janke, A. Jankowiak, T. Kamps, S. Klauke, G. Klemz, J. Knobloch, G. Kourkafas, J. Kühn, O. Kugeler, N. Leuschner, A.N. Matveenko, S. Mistry, N. Ohm, E. Panofski, H. Plötz, S. Rotterdam, M.A.H. Schmeißer, M. Schuster, H. Stein, Y. Tamashevich, J. Ullrich, A. Ushakov, J. Völker
    HZB, Berlin, Germany
  • T. Kamps
    HU Berlin, Berlin, Germany
  
  Funding: Work supported by German Bundesministerium für Bildung und Forschung, Land Berlin, and grants of Helmholtz Association
Helmholtz-Zentrum Berlin (HZB) is on the final round to complete an high average current superconducting (SC) ERL as a prototype to demonstrate low normalized beam emittance of 1 mm·mrad at 100mA and short pulses of about 2 ps. The high brilliance beam will originate from an 1.4 x λ/2 cell SRF cavity with a normal-conducting, high quantum efficiency CsK2Sb cathode, implementing a modified HZDR-style cathode insert. This prototype injector potentially allows for 6 mA beam current and up to 3.5 MeV beam kinetic energy, limited by the modified twin TTF-III fundamental power couplers. In this contribution the operation of the SRF injector cavity with a Copper cathode within a dedicated beam test experiment called Gunlab will be presented. The second half of the talk will give an overview about on-going activities to refurbish and reinstall the SRF gun module in the accelerator hall in BERLinPro. Also an insight into the repair attempts of the first cavity suffering from field emission will be given. 		 
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THCOZBS03
 Magnetized Beam Generated from DC Gun for JLEIC Electron Cooler  
 
  • S.V. Benson, P.A. Adderley, J.F. Benesch, D.B. Bullard, J.M. Grames, J. Guo, F.E. Hannon, J. Hansknecht, C. Hernandez-Garcia, R. Kazimi, G.A. Krafft, M.A. Mamun, M. Poelker, R. Suleiman, M.G. Tiefenback, Y.W. Wang, S. Zhang
    JLab, Newport News, Virginia, USA
  • J.R. Delayen
    ODU, Norfolk, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177
Bunched-beam electron cooling is a key feature of all proposed designs of the future electron-ion collider, and a requirement for achieving the specified collision luminosity of the order 1034 cm-2s−1. For the Jefferson Lab Electron Ion Collider (JLEIC), fast cooling of ion beams will be accomplished via so-called ’magnetized electron cooling’, where the cooling process will occur inside a long solenoid field, which will be part of the collider ring and facilitated using a circulator ring and Energy Recovery Linac (ERL). In this contribution, we describe recent achievements that include the generation of picosecond-bunch magnetized beams at average currents up to 28 mA with exceptionally long photocathode lifetime, and independent demonstrations of magnetized beam with high bunch charge up to 700 pC at 10s of kHz repetition rates using a compact 300 kV DC high voltage photogun with an inverted insulator geometry and alkali-antimonide photocathodes. Magnetization characterization including beam rotation and drift emittance were also presented for various gun bias voltages and laser spot sizes at the photocathode using 532 nm lasers with DC and RF time structure. These accomplishments mark important steps toward demonstrating the feasibility of a technically challenging JLEIC cooler design using magnetized beams. 		 
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THCOZBS04
 Injector Development at KEK  
 
  • T. Miyajima
    KEK, Ibaraki, Japan
  
  Since 2013, we have operated the compact ERL (cERL) injector at KEK to demonstrate hardware and beam performances for future ERL accelerator. The injector consists of a 500 kV DC photocathode gun, solenoid magnets, a normal conducting buncher and three 2-cell superconducting cavities. In beam operation, the DC gun with GaAS photocathode is very stable with DC 500 kV, and can generate stable CW 1 mA electron beam. For low bunch charge operation, we achieved designed beam performance with low emittance and short bunch length in the injector. From 2017, we started high bunch charge operation with 60 pC bunch charge toward an infrared free electron laser (IR FEL) test. In June 2019, we achieved the requirements of injector beam performance for the IR FEL test, which were < 3 mm mrad normalized emittance and 4 ps RMS bunch length.  
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