Author: Seok, J.
Paper Title Page
TUXB06
 High Transformer Ratio Plasma Wakefield Acceleration and Current Profile Reconstruction Using Emittance Exchange  
 
  • R.J. Roussel
    Enrico Fermi Institute, University of Chicago, Chicago, Illinois, USA
  • G. Andonian, A. Deng, C.E. Hansel, G.E. Lawler, W.J. Lynn, R. Robles, J.B. Rosenzweig, K. Sanwalka
    UCLA, Los Angeles, USA
  • S. Baturin
    Northern Illinois University, DeKalb, Illinois, USA
  • M.E. Conde, D.S. Doran, G. Ha, J.G. Power, J. Seok, C. Whiteford, E.E. Wisniewski
    ANL, Lemont, Illinois, USA
  
  Funding: This work is supported by the Department of Energy, Office of High Energy Physics, under Contract No. DESC0017648.
To over­come lim­its on total ac­cel­er­a­tion achiev­able in plasma wake­field ac­cel­er­a­tors, spe­cially shaped drive beams can be used to in­crease the trans­former ratio, im­ply­ing that the drive beam de­cel­er­a­tion is min­i­mized in com­par­i­son with ac­cel­er­a­tion ob­tained in the wake. We re­port the re­sults of a non­lin­ear PWFA, high trans­former ratio ex­per­i­ment using high-charge, lon­gi­tu­di­nally asym­met­ric drive beams in a plasma cell. An emit­tance ex­change process is used to gen­er­ate vari­able drive cur­rent pro­files, in con­junc­tion with a long (mul­ti­ple plasma wave­length) wit­ness beam. The wit­ness beam is en­ergy-mod­u­lated by the wake­field, yield­ing a re­sponse that con­tains de­tailed spec­tral in­for­ma­tion in a sin­gle-shot mea­sure­ment. Using these meth­ods, we gen­er­ate a va­ri­ety of beam pro­files and char­ac­ter­ize the wake­fields, di­rectly ob­serv­ing beam-loaded trans­former ra­tios up to 7.8. Fur­ther, a spec­trally-based cur­rent re­con­struc­tion tech­nique, val­i­dated by 3D par­ti­cle-in-cell sim­u­la­tions, is in­tro­duced to ob­tain the drive beam pro­file from the de­cel­er­at­ing wake­field data. 		 
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