Conference Presentation

PUBDB-2023-07739

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Driver energy depletion - Energy Depletion and Re-Acceleration of Driver Electrons

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

2023

Abstract: For plasma-wakefield accelerators to fulfil their potential for cost effectiveness and reduced envi-ronmental footprint, it is essential that their energy-transfer efficiency be maximized. A key aspectof this efficiency is the near-complete transfer of energy, or depletion, from the driver electrons tothe plasma wake. Achieving full depletion is limited by the process of re-acceleration, which oc-curs when the driver electrons decelerate to non-relativistic energies, slipping backwards into theaccelerating phase of the wakefield and being subsequently re-accelerated. Such re-accelerationis observed here for the first time. At this re-acceleration limit, we measure a beam driver de-positing (56 ± 5)% of its energy into a 195-mm-long plasma. Combining this driver-to-plasmaefficiency with previously measured plasma-to-beam and expected wall-plug-to-driver efficien-cies, our result shows that plasma-wakefield accelerators can in principle reach or even exceed theenergy-transfer efficiency of conventional accelerators.

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Contributing Institute(s):

1. FTX Fachgruppe AST (HH_FH_FTX_AS)
2. Beam-Driven Plasma Accelerators (MPA2)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)

Experiment(s):

1. FLASHForward

Appears in the scientific report 2023

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