Author: Boulton, L.A.
Paper Title Page
TUXB02
 Precision Control of Plasma Wakefields for Highly Efficient and Energy-Spread-Preserving Electron Acceleration  
 
  • S. Schröder, S. Bohlen, L.A. Boulton, R.T.P. D’Arcy, S. Diederichs, J.M. Garland, P. Gonzalez-Caminal, A. Knetsch, C.A. Lindstrøm, G. Loisch, A. Martinez de la Ossa, J. Osterhoff, K. Poder, L. Schaper, B. Schmidt, B. Sheeran, G.E. Tauscher, S. Wesch, J.C. Wood, J. Zemella
    DESY, Hamburg, Germany
  • L.A. Boulton
    USTRAT/SUPA, Glasgow, United Kingdom
  • J. Chappell
    UCL, London, United Kingdom
  
  Plasma-wake­field ac­cel­er­a­tors dri­ven by in­tense par­ti­cle beams promise to sig­nif­i­cantly re­duce the size of fu­ture high-en­ergy fa­cil­i­ties. These ap­pli­ca­tions re­quire an en­ergy-ef­fi­cient ac­cel­er­a­tion process with a well-con­trolled en­ergy spec­trum, both of which can be achieved si­mul­ta­ne­ously by tai­lor­ing the plasma wake­field. A pre­req­ui­site for such con­trol of the wake­field is its pre­cise mea­sure­ment. Here we dis­cuss a new mea­sure­ment tech­nique that en­ables fem­tosec­ond-level sam­pling of the lon­gi­tu­di­nal elec­tric fields and that is par­tic­u­larly pow­er­ful due to its op­er­a­tional sim­plic­ity*. Using this method, we ex­per­i­men­tally demon­strated op­ti­mal beam load­ing in a non­lin­ear elec­tron-dri­ven plasma ac­cel­er­a­tor by wake­field flat­ten­ing at the few-per­cent level**. Bunches were ac­cel­er­ated at a gra­di­ent of 1.3 GV/m and with an en­ergy-trans­fer ef­fi­ciency of (42±4)% while pre­serv­ing per-mille en­ergy spreads with full charge cou­pling. These re­sults open the door to the high-qual­ity op­er­a­tion of fu­ture plasma ac­cel­er­a­tors through pre­cise con­trol of the ac­cel­er­a­tion process.
* S. Schröder, et al. Nat Commun 11, 5984 (2020)
** C.A. Lindstrøm, et al. Phys. Rev. Lett. 126, 014801 (2021) 		 
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