München 2019 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 10: New Accelerator Concepts
AKBP 10.5: Talk
Wednesday, March 20, 2019, 12:00–12:15, HS 8
High-power laser grating deformation and resulting spatio-temporal couplings — •Vincent Leroux1,2, Manuel Kirchen1, Sören Jalas1, Philipp Messner1,3, Paul Winkler1,2, Matthias Schnepp1, Timo Eichner1, Christian Werle1, and Andreas R. Maier1 — 1Center for Free-Electron Laser Science, Hamburg, Germany — 2DESY, Hamburg, Germany — 3Max-Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
Laser-plasma accelerators are driven by hundreds terawatt or up to petawatt laser systems, at a few Hz repetition rates. Furthermore, as the laser technology pushes forward the average power limit, the absorbed heat into the gold-coated in-vacuum compressor gratings increases. This heat leads to deformations of the grating surface which changes the spatial and temporal properties of the laser beam during high-power operation, which can in turn drastically decrease the peak intensity on target, as well as degrade the quality of the accelerated electron beams.
We previously investigated the impact of the grating deformation on the compressed laser wavefront, and we now report on the simulation of the spatio-temporal couplings stemming from the same causes. We then draw conclusions on the overall decrease of the peak intensity in the focal plane due to both the increase in pulse duration and beam size.