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| Home > Publications database > Preliminary Simulation of Terahertz Superradiance Generation at PITZ |
| Conference Presentation | PUBDB-2026-00328 |
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2025
Abstract: The photoinjector test facility at DESY in Zeuthen (PITZ) is developing a THz free electron laser (FEL) using its high brightness electron beams. At present, more than 100 µJ pulse energies have been demonstrated at 3 THz using 17 MeV/c electron bunches with up to 2.5 nC charge. One research direction of us is short-pulse high-energy THz radiation for pump–probe experiments at advanced X-ray free-electron lasers (XFELs).In this work, we present a parameter study of the electron bunch for generating few-cycle high-energy THz pulses, along with a start-to-end (S2E) simulation to explore the feasibility of producing the required bunch using the existing THz beamline.The parameter study used ideal 6-D Gaussian distributed electron bunches as the electron source at undulator entrance. The FEL performance was simulated using GENESIS1.3 with the LCLS-I undulator at PITZ. The effects of bunch length and correlated/uncorrelated energy spread are shown and discussed in this section.The S2E simulation shows the multi-objective generic algorithm (MOGA) optimization for minimizing bunch length and transversal emittance (Astra simulation). Then, the beam transport via the chicane to the undulator was simulated using ocelot. The feasibility and challenges of producing the desired electron bunch at undulator entrance are shown and discussed in this section, as well as the final FEL performance.In summary, this work analyzed the requirements for electron bunches on length and energy spread for generating few-cycle high-energy THz FEL radiation and discussed the feasibility and potential performance of using PITZ facility to achieve that.
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