IPAC'24 - 15th International Particle Accelerator Conference

Simulations of dielectric-lined waveguide seeding option for THz FEL at PITZ

MOPG69

20 May 2024, 16:00

2h

Bluegrass (MCC Exhibit Hall A)

Poster Presentation MC2.A06 Free Electron Lasers Monday Poster Session

Speaker

Xiao-Yang Zhang (Tsinghua University in Beijing)

Description

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 3 THz from electron bunches of 2-3 nC. The measured shot-to-shot radiation pulse energy has a fluctuation of ~10\%. Shot-to-shot stability and temporal coherence in FELs can be greatly enhanced by the seeding method. In this paper, we propose the use of dielectric-lined waveguides (DLW) to obtain the initial seeding signal. Simulations of using electromagnetic wakefield in DLW to get energy modulation, control the transformation between energy modulation and density modulation, space charge dominated beam matching with chicane will be presented.