Dortmund 2021 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 2: New Accelerator Concepts
AKBP 2.6: Vortrag
Dienstag, 16. März 2021, 15:15–15:30, AKBPa
Optimal beam loading in a laser-plasma accelerator — •Manuel Kirchen1, Sören Jalas1, Philipp Messner2,1, Paul Winkler3,1, Timo Eichner1, Thomas Hülsenbusch3,1, Laurids Jeppe1, Trupen Parikh3, Matthias Schnepp1, and Andreas R. Maier3,1 — 1Center for Free-Electron Laser Science and Department of Physics Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2International Max Planck Research School for Ultrafast Imaging & Structural Dynamics, Luruper Chaussee 149, 22761 Hamburg, Germany — 3Deutsches Elektronen Synchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany
Applications of laser-plasma accelerators demand low energy spread beams and high-efficiency operation. Achieving both requires to flatten the accelerating fields by controlled beam loading of the plasma wave. Here, we tailor the current profile of an ionisation-injected electron bunch and optimize the laser-plasma dynamics to operate at such optimal beam loading conditions. This enables the reproducible production of 1.2% rms energy spread bunches with 282 MeV and 44 pC, at an estimated energy-transfer efficiency of 19%. We correlate shot-to-shot variations to reveal the phase space dynamics and train a neural network that predicts the beam quality as a function of the drive laser.