München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Instrumentation XI, Accelerators and Applications

HK 52.2: Talk

Thursday, March 21, 2019, 14:30–14:45, HS 11

A feedback system to minimize the electron bunch arrival-time jitter between femtosecond laser pulses and electron bunches for Laser-Driven Plasma Wakefield Accelerators — •Stefano Mattiello¹, Holger Schlarb², and Andreas Penirschke¹ — ¹Technische Hochschule Mittelhessen, Friedberg, Deutschland — ²DESY, Hamburg, Deutschland

In a laser driven plasma based particle accelerator a stable synchronization of the electron bunch and of the plasma wake field in the range of less than 2 fs is necessary in order to optimize the acceleration. For this purpose we are developing a new shot to shot feedback system with a time resolution of less than 1 fs. We plane to generate stable THz pulses by optical rectification of a fraction of the plasma generating high energy laser pulses in a nonlinear lithium niobate crystal. With these pulses we will energy modulate the electron bunches shot to shot before the plasma to achieve the time resolution. In this contribution we will focus on realization aspects of the shot to shot feedback system and the lithium niobate crystal itself. Here we compare different approximations for the modeling of the generation dynamics (second order or first order calculation) and of the dielectric function (influence of the dispersion relation, of the free carries generated by the pump adsorption and their saturation, depletion of the pump) in order to investigate the importance of a detailed description of the optical properties for the THz generation.