Author: Miahnahri, A.
Paper Title Page
FRXA04
 Commissioning results of LCLS-II MHz repetition rate electron source  
 
  • F. Zhou, C. Adolphsen, A.L. Benwell, G.W. Brown, D. Dowell, M.P. Dunning, S. Gilevich, K. Grouev, B.T. Jacobson, X. Liu, A. Miahnahri, J.F. Schmerge, T. Vecchione
    SLAC, Menlo Park, California, USA
  • G. Huang, F. Sannibale
    LBNL, Berkeley, California, USA
  
  Funding: work supported by DOE under grant No. DE-AC02-76SF00515
A 4 GeV 1.3 GHz superconducting linac is being constructed at SLAC as part of the X-ray free electron laser project (LCLS-II). The first 3-meter of the electron source that includes a normal conducting 185.7MHz CW RF gun, 2-cell 1.3 GHz CW RF buncher, and a loadlock system for cathode changes was designed and built by LBNL based on their experience with similar one for advanced photo-injector experiment program. The electron beam is designed to operate at a high repetition rate, up to 1 MHz. Since summer of 2018 we started LCLS-II injector source commissioning immediately after the major installation completion. This paper presents major commissioning results including achievements of ultra-high vacuum, RF processing to CW nominal power, dark current characterization and mitigation, and high-brightness electron beam measurements. 		 
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