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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 14: Light Sources and FEL’s

AKBP 14.4: Talk

Thursday, March 21, 2024, 17:00–17:15, E 020

Optimization of the seeded THz-FEL at PITZ: study of shot noise and initial bunching factor impact for experimental beam conditions — •Xiaoyang Zhang, Xiangkun Li, Prach Boonpornprasert, and Mikhail Krasilnikov — Deutsches Elektronen- Synchrotron DESY, Zeuthen, Germany

The first operational high peak and average power THz SASE FEL at the Photo Injector Test Facility at DESY in Zeuthen (PITZ) has demonstrated up to 100 uJ single pulse energy at a center frequency of 3THz from electron bunches of 2-3 nC. The measured shot-to-shot radiation pulse energy has a fluctuation of ~10%. In previous studies, several seeding methods have been proposed in order to enhance the performance of the THz source, particularly in terms of shot-to-shot stability and temporal coherence. THz-FEL simulations with ideal electron beam parameters (temporal flattop with a peak current of 200A) have shown that a bunching factor of 10e-2 to 10e-3 is required for efficient seeding. In this talk, the seeding conditions for the PITZ experimental beam parameters (temporal Gaussian profile with a peak current of ~100 A) will be investigated, in particular the impact of the short noise and the initial bunching factor on the radiation pulse energy, stability and other properties of THz pulses.

Keywords: THz; FEL; Seeding; Simulation