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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 2: Novel Accelerator Concepts I

AKBP 2.2: Vortrag

Dienstag, 1. April 2025, 14:15–14:30, ZHG004

Ultrafast plasma wave shadowgraphy for laser wakefield acceleration — •Paula Sedlatschek, Marc Osenberg, Thomas Heinemann, Mirela Cerchez, Onur Bilen, Edgar Hartmann, and Bernhard Hidding — Institute for Laser- and Plasmaphysics, Heinrich Heine University Düsseldorf

Plasma Shadowgraphy via an ultrashort laser pulse can be utilized to probe the small and fast processes in laser wakefield accelerators (LWFAs). This high-resolution technique reveals the plasma dynamics in the sub-micrometer, femtosecond-regime and visualizes the accelerating plasma wave. We present our approach to implement such a probe laser, using a low-power split-off from the main laser driver which is subsequently and further spectrally broadened. The modulated spectrum of the probe laser enables the use of cut-off filters which block the fundamental spectrum from the accelerating main laser. This is leading to precise visualization of density gradients within the plasma. By integrating this method, we aim for a comprehensive characterization of critical LWFA parameters, such as plasma density evolution, wakefield stability, and laser-plasma coupling. This non-intrusive diagnostic intends to improve our laser wakefield accelerator.

Keywords: shadowgraphy; laser wakefield accelerators; ultrashort laser pulse; high-resolution technique