Dresden 2020 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: Diagnostics, Syn. radiation and FELs

AKBP 11.6: Talk

Wednesday, March 18, 2020, 10:45–11:00, MOL 213

Studies on seeding of THz SASE FEL by photocathode laser pulse modulation for PITZ — •Georgi Georgiev¹, Mikhail Krasilnikov¹, and Wolfgang Hillert² — ¹Deutsches Elektronen-Synchrotron DESY, 15738 Zeuthen, Germany — ²University of Hamburg, 22761 Hamburg, Germany

A THz SASE FEL is investigated at the Photo Injector Test Facility at DESY in Zeuthen (PITZ) as a THz radiation source, that is proposed for pump-probe experiments at the EXFEL. Proof-of-principle experiments are considered with LCLS-I undulators, to be installed in the tunnel annex. Start to end simulations point to FEL saturation from shot noise being reached at about the lenght of the undulator with approximately 0.5 mJ THz pulse energy at 100 μm center wavelenght. To further improve the pulse energy, saturation lenght and stability of SASE, several seeding methods are considered. A temporal intensity modulation of the photocathode laser pulse is planned as one of these methods. Beam dynamics simulations carried on ASTRA have been performed to study the longitudinal modulation of the electron beam from the PITZ photo injector and results will be presented.