Author: Knetsch, 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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