Dortmund 2021 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: Diagnostics, Control and Instrumentation III

AKBP 11.7: Vortrag

Donnerstag, 18. März 2021, 18:00–18:15, AKBPa

Laser development for L(P)WFA experiments and driver laser pulse diagnostics and stability — Stefan Karsch, Andreas Döpp, Gregor Schilling, Moritz Foerster, Katinka v. Grafenstein, •Florian Haberstroh, Faran Irshad, and Enes Travac — High-Field Lasers and Applications Group of Ludwig-Maximilians-Universität München, Am Coulombwall 1, 85748 Garching, Germany

The Center for Advances Laser Applications (CALA) combines powerful lasers and experimental areas with a focus on electron and ion acceleration. For such experiments the solid-state laser Atlas-3000 is developed. The lasers backbone, a chain of Ti:Sa based chirped pulse amplifiers (CPA) delivers an energy of up to 90J per pulse at a repetition rate of 1Hz and a central wavelength of 800nm. Compressing these pulses to 28fs (FWHM) yields a peak power of 2PW. Such a system can be used to drive a laser wakefield accelerator (LWFA) to generate electron bunches in the energy regime of GeV and with a charge of multiple nC. The accelerated electron's energy spectrum and charge is determined by the pulse parameters of the driving laser. But how sensitive is the acceleration process to temporal, spatial and spectral pulse properties? With the aim to eliminate pre-pulses and generate cleaner pulses, we evaluate the laser pulse's temporal contrast. It was just as important to ensure a flat wave front for amplification, compression and interaction with the target. Spectral and temporal pulse profiles are recorded during the experiments and are correlated to the accelerated electrons. We show measures to reduce breathing and to stabilize pointing of the focus in the gas target. Recorded HDR images build a 2D intensity map in and near the focus which helps evaluate the focus quality, for instance to optimizing the Strehl ratio.