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Colby, E.R.

Paper Title Page
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.

  
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).

  
THPEC013 Compact Couplers for Photonic Crystal Laser-driven Accelerator Structures 4077
 
  • B.M. Cowan, M.C. Lin, B.T. Schwartz
    Tech-X, Boulder, Colorado
  • R.L. Byer, C. McGuinness
    Stanford University, Stanford, California
  • E.R. Colby, R.J. England, R.J. Noble, J.E. Spencer
    SLAC, Menlo Park, California
  
 

Pho­ton­ic crys­tal waveg­uides are promis­ing can­di­dates for laser-driv­en ac­cel­er­a­tor struc­tures be­cause of their abil­i­ty to con­fine a speed-of-light mode in an all-di­elec­tric struc­ture. Be­cause of the dif­fer­ence be­tween the group ve­loc­i­ty of the waveg­uide mode and the par­ti­cle bunch ve­loc­i­ty, fields must be cou­pled into the ac­cel­er­at­ing waveg­uide at fre­quent in­ter­vals. There­fore ef­fi­cient, com­pact cou­plers are crit­i­cal to over­all ac­cel­er­a­tor ef­fi­cien­cy. We pre­sent de­signs and sim­u­la­tions of high-ef­fi­cien­cy cou­pling to the ac­cel­er­at­ing mode in a three-di­men­sion­al pho­ton­ic crys­tal waveg­uide from a waveg­uide ad­join­ing it at 90 de­grees. We dis­cuss de­tails of the com­pu­ta­tion, in­clud­ing an op­ti­miza­tion rou­tine to mod­i­fy the ge­o­met­ric pa­ram­e­ters of the cou­pler for max­i­mum ef­fi­cien­cy, the re­sult­ing trans­mis­sion, and es­ti­mates of the fab­ri­ca­tion tol­er­ance for these de­vices. We in­clude some back­ground on the ac­cel­er­a­tor struc­ture and pho­ton­ic crys­tal-based op­ti­cal ac­cel­er­a­tion in gen­er­al.