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Xiang, D.

Paper Title Page
TUPE072 Preliminary results of the echo-seeding experiment ECHO-7 at SLAC 2299
 
  • D. Xiang, E.R. Colby, Y.T. Ding, M.P. Dunning, J.T. Frederico, A. Gilevich, C. Hast, R.K. Jobe, D.J. McCormick, J. Nelson, T.O. Raubenheimer, K. Soong, G.V. Stupakov, Z.M. Szalata, D.R. Walz, S.P. Weathersby, M. Woodley
    SLAC, Menlo Park, California
  • J.N. Corlett, G. Penn, S. Prestemon, J. Qiang, D. Schlueter, M. Venturini, W. Wan
    LBNL, Berkeley, California
  • P.L. Pernet
    EPFL, Lausanne
  
 

ECHO-7 is a proof-of-prin­ci­ple echo-en­abled har­mon­ic gen­er­a­tion* FEL ex­per­i­ment in the Next Lin­ear Col­lid­er Test Ac­cel­er­a­tor (NLCTA) at SLAC. The ex­per­i­ment aims to gen­er­ate co­her­ent ra­di­a­tion at 318 nm and 227 nm, which is the 5th and 7th har­mon­ic of the in­frared seed laser. In this paper we pre­sent the pre­lim­i­nary re­sults from the com­mis­sion­ing run of the com­plet­ed ex­per­i­men­tal setup which start­ed in April 2010.


* G. Stupakov, PRL, 102, 074801 (2009); D. Xiang and G. Stupakov, PRST-AB, 12, 030702 (2009).

  
TUPE065 Surface Characterization of the LCLS RF Gun Cathode 2284
 
  • A. Brachmann, F.-J. Decker, Y.T. Ding, D. Dowell, P. Emma, J.C. Frisch, A. Gilevich, G.R. Hays, P. Hering, Z. Huang, R.H. Iverson, H. Loos, A. Miahnahri, D. Nordlund, H.-D. Nuhn, P.A. Pianetta, J.L. Turner, J.J. Welch, W.E. White, J. Wu, D. Xiang
    SLAC, Menlo Park, California
  
 

Sur­face char­ac­ter­i­za­tion of the LCLS RF gun cath­ode A. Brach­mann On be­half of the LCLS com­mis­sion­ing team The first cop­per cath­ode in­stalled in the LCLS RF gun was used dur­ing LCLS com­mis­sion­ing for more than a year. How­ev­er, after high charge op­er­a­tion (~ 500 pC), the cath­ode showed a de­cline of quan­tum ef­fi­cien­cy due to sur­face con­tam­i­na­tion caused by resid­u­al ion­ized gas species pre­sent in the vac­u­um sys­tem. We re­port re­sults of SEM, XPS and XAS stud­ies that were car­ried out on this cath­ode after it was re­moved from the gun. X-ray ab­sorp­tion and X-ray pho­to­elec­tron spec­troscopy re­veal sur­face con­tam­i­na­tion by var­i­ous hy­dro­car­bon com­pounds. In ad­di­tion we re­port on the per­for­mance of the sec­ond in­stalled cath­ode with em­pha­sis on the spa­tial dis­tri­bu­tion of elec­tron emis­sion.

  
TUPE069 A Proof-of-principle Echo-enabled Harmonic Generation FEL Experiment at SLAC 2293
 
  • M.P. Dunning, E.R. Colby, Y.T. Ding, J.T. Frederico, A. Gilevich, C. Hast, R.K. Jobe, D.J. McCormick, J. Nelson, T.O. Raubenheimer, K. Soong, G.V. Stupakov, Z.M. Szalata, D.R. Walz, S.P. Weathersby, M. Woodley, D. Xiang
    SLAC, Menlo Park, California
  • J.N. Corlett, G. Penn, S. Prestemon, J. Qiang, D. Schlueter, M. Venturini, W. Wan
    LBNL, Berkeley, California
  • P.L. Pernet
    EPFL, Lausanne
  
 

In this paper we de­scribe the tech­ni­cal de­sign of an on-go­ing proof-of-prin­ci­ple echo-en­abled har­mon­ic gen­er­a­tion (EEHG) FEL ex­per­i­ment in the Next Lin­ear Col­lid­er Test Ac­cel­er­a­tor (NLCTA) at SLAC. The ex­per­i­ment was de­signed through late 2009 and built and in­stalled be­tween Oc­to­ber 2009 and Jan­uary 2010. We pre­sent the de­sign con­sid­er­a­tions, the tech­ni­cal re­al­iza­tion and the ex­pect­ed per­for­mances of the EEHG ex­per­i­ment.