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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 5: Laser Systems and Laser Applications
K 5.3: Talk
Wednesday, March 11, 2020, 11:30–11:45, f428
THz generation by optical rectification for a novel shot to shot synchronization system between electron bunches and femtosecond Laser pulses in a plasma wakefield accelerator — •Stefano Mattiello1, Holger Schlarb2, and Andreas Penirschke1 — 1Technische Hochschule Mittelhessen, Friedberg, Deutschland — 2DESY, Hamburg, Deutschland
We investigate the influence of the optical properties and of the theoretical description of the THz generation on the conversion efficiency as well as on the optimum crystal length for the generation length of short THz pulses. The application is a feedback system for SINBAD with a time resolution of less than 1 fs for the synchronization of the electron bunch and of the plasma wake field in a laser driven plasma particle accelerator. Here stable THz pulses are generated by optical rectification of a fraction of the plasma generating high energy laser pulses in a nonlinear lithium niobate crystal. Then the generated THz pulses will energy modulate the electron bunches shot to shot before the plasma to achieve the required time resolution. In this contribution we compare different approximations for the modeling of the generation dynamics applying second order or first order equations, using different approximations for the optical properties as well as considering pump depletion effects. Additionally, a comparison with new analytic solutions for a dispersive medium is presented.