Longitudinally Resolved Measurement of Energy-Transfer Efficiency in a Plasma-Wakefield Accelerator

Boulton, Lewis; Osterhoff, Jens; Lindstroem, Carl Andreas; D'Arcy, Richard; Poder, Kristjan; Loisch, Gregor; Gonzalez Caminal, Pau; Wesch, Stephan; Beinortaite, Judita; Garland, Matthew James; Schröder, Sarah; Hidding, Bernhard; Björklund Svensson, Jonas Halfdan; Pena Asmus, Felipe Lars; Wood, Jonathan Christopher

Preprint

PUBDB-2022-04629

Longitudinally Resolved Measurement of Energy-Transfer Efficiency in a Plasma-Wakefield Accelerator

Boulton, L. (Corresponding author)Extern* ; Lindstroem, C. A.DESY* ; Beinortaite, J.DESY* ; Björklund Svensson, J. H.DESY* ; Garland, M. J.DESY* ; Gonzalez Caminal, P.Extern*DESY* ; Hidding, B. ; Loisch, G.Extern*DESY* ; Pena Asmus, F. L.DESY* ; Poder, K.DESY* ; Schröder, S.DESY* ; Wesch, S.DESY* ; Wood, J. C.DESY* ; Osterhoff, J.DESY* ; D'Arcy, R.DESY*

2022

(2022)

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Report No.: arXiv:2209.06690

Abstract: Energy-transfer efficiency is an important quantity in plasma-wakefield acceleration, especially for applications that demand high average power. Conventionally, the efficiency is measured using an electron spectrometer; an invasive method that provides an energy-transfer efficiency averaged over the full length of the plasma accelerator. Here, we experimentally demonstrate a novel diagnostic utilizing the excess light emitted by the plasma after a beam–plasma interaction, which yields noninvasive, longitudinally resolved measurements of the local energy-transfer efficiency from the wake to the accelerated bunch; here, as high as (58 ± 3)%. This method is suitable for online optimization of individual stages in a future multistage plasma accelerator, and enables experimental studies of the relation between efficiency and transverse instability in the acceleration process.

Keyword(s): accelerator: plasma ; plasma: wake field ; efficiency ; measurement methods ; experimental methods ; photon: emission