Author: Inacker, P.
Paper Title Page
WEPAB138 Superconducting RF Gun with High Current and the Capability to Generate Polarized Electron Beams 2936
 
  • I. Petrushina
    SUNY SB, Stony Brook, New York, USA
  • S.A. Belomestnykh, S. Kazakov, T.N. Khabiboulline, M. Martinello, Y.M. Pischalnikov, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • J.C. Brutus, P. Inacker, Y.C. Jing, V. Litvinenko, J. Skaritka, E. Wang
    BNL, Upton, New York, USA
  • J.M. Grames, M. Poelker, R. Suleiman, E.J-M. Voutier
    JLab, Newport News, Virginia, USA
 
  High-cur­rent low-emit­tance CW elec­tron beams are in­dis­pens­able for nu­clear and high-en­ergy physics fixed tar­get and col­lider ex­per­i­ments, cool­ing high en­ergy hadron beams, gen­er­at­ing CW beams of mono­en­er­getic X-rays (in FELs) and gamma-rays (in Comp­ton sources). Po­lar­iza­tion of elec­trons in these beams pro­vides extra value by open­ing a new set of ob­serv­ables and fre­quently im­prov­ing the data qual­ity. We re­port on the up­grade of the unique and fully func­tional CW SRF 1.25 MeV SRF gun, built as part of the Co­her­ent elec­tron Cool­ing (CeC) pro­ject, which has demon­strated sus­tained CW op­er­a­tion with CsK2Sb pho­to­cath­odes gen­er­at­ing elec­tron bunches with record-low trans­verse emit­tances and record-high bunch charge ex­ceed­ing 10 nC. We pro­pose to ex­tend the ca­pa­bil­i­ties of this sys­tem to high av­er­age cur­rent of 100 mil­liampere in two steps: in­creas­ing the cur­rent 30-fold at each step with the goal to demon­strate re­li­able long-term op­er­a­tion of the high-cur­rent low-emit­tance CW SRF guns. We also pro­pose to test po­lar­ized GaAs pho­to­cath­odes in the ul­tra-high vac­uum (UHV) en­vi­ron­ment of the SRF gun, which has never been suc­cess­fully demon­strated in RF ac­cel­er­a­tors.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB138  
About • paper received ※ 25 May 2021       paper accepted ※ 29 July 2021       issue date ※ 23 August 2021  
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