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The Photo Injector Test Facility at DESY in Zeuthen (PITZ) is developing a THz free electron laser (FEL) as a potential source for pump-probe experiments at the European XFEL. Currently, pulse energies exceeding 100 µJ at 3 THz have been demonstrated in a proof-of-principle experiment using the LCLS-I undulator together with the 17 MeV/c electron beam with charges of up to 2.5 nC from the PITZ injector.
In this work, we present a simulation study for an ideal THz FEL facility driven by a PITZ-like injector which -unlike the actual PITZ, being a multipurpose facility -would operate as a fully THz-dedicated machine. Compared to the existing beamline, the beam energy is increased to up to 40 MeV with two accelerator modules to mitigate space-charge effects and a helical APPLE-II type undulator is considered. A bunch compressor with tunable R56 is included to provide flexible control of the peak current. A parameter study of the FEL radiation performance for the chosen APPLE-II undulator has been carried out to define the desired electron beam properties, which are then achieved by optimizing the injector and the beamline lattice in start-to-end (S2E) simulations. The resulting simulated performance of the THz source is reported in this paper.
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