Author: Benwell, A.L.
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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