Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Laser Plasmas

P 11.2: Vortrag

Mittwoch, 2. April 2025, 11:30–11:45, ZHG102

Utilization of quasi-neutral plasma to enhance coherent light emission in free electron lasers — •Cagri Erciyes, Matteo Tamburini, and Christoph H. Keitel — Max Planck Institute for Nuclear Physics, Heidelberg

The behavior of relativistic quasi-neutral plasma and the corresponding enhancement of coherent light emission are investigated by examining the free electron laser (FEL) setup. A key characteristic of the lasing mechanism in FELs is microbunching, which leads to the concentration of beam charges into slices shorter than the radiation wavelength, thereby enhancing coherent radiation. We investigate microbunching and coherent emission in FELs when quasi-neutral beams (either electron/positron or electron/proton) rather than a pure-electron bunch are utilized. The possibility of denser beams is expected to lead to an enhancement of power gain via the microbunching mechanism. Due to the sensitivity of the lasing process to initial conditions, both Self-Amplified Spontaneous Emission (startup from shot noise) and seed laser mechanisms are explored.

Keywords: free electron laser; microbunching; coherence; quasi neutral plasma; SASE