Mainz 2022 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 12: New Accelerator Concepts 2
AKBP 12.5: Talk
Wednesday, March 30, 2022, 17:00–17:15, AKBP-H14
Signal subtraction of consecutive electron bunches from a high-repetition-rate plasma-wakefield accelerator — •Judita Beinortaite1,2, James Chappell2, Gregor Loisch1, Carl A. Lindstrøm1, Sarah Schröder1, Stephan Wesch1, Matthew Wing1,2, Jens Osterhoff1, and Richard D'Arcy1 — 1DESY, Hamburg, Germany — 2University College London, London, UK
Plasma-wakefield acceleration (PWFA) is one of the main candidates for future compact-accelerator technologies with applications in high energy physics and photon science. For PWFA, which currently operates at Hz level, to meet the luminosity and brilliance demands of current users, at least thousands of bunches must be delivered per second. As recently explored at FLASHForward, DESY, the fundamental limitation for the highest repetition rate is the long-term motion of ions that follows the dissipation of the driven wakefield (D'Arcy, R. et al. Recovery time of a plasma-wakefield accelerator. Nature (accepted) (2021)). The recovery of the plasma to an undisturbed state after the driving of a wakefield was observed in the images of consecutive electron bunches, separated by tens of nanoseconds, while the imaging screens have scintillation lifetimes of the order milliseconds. As such, an image processing technique capable of resolving individual bunches within that lifetime is needed. This technique - termed the 'subtraction method' - uses many shots of a preceding bunch to accurately identify and remove its signal from the overlapping signal of a subsequent bunch. As a result, high-repetition-rate processes can be studied to advance PWFA for meaningful application to facilities of the future.