Berlin 2024 – wissenschaftliches Programm

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 14: Light Sources and FEL’s

AKBP 14.1: Vortrag

Donnerstag, 21. März 2024, 16:15–16:30, E 020

Analytical And Numerical Studies On Experimental HGHG Data At FLASH — •Hendrik Wenzel¹, Sven Ackermann², Margarit Asatrian¹, Eugenio Ferrari², Samuel Hartwell², Wolfgang Hillert¹, Mehdi Kazemi², Tino Lang², Velizar Miltchev¹, Pardis Niknejadi², Fabian Pannek³, Georgia Paraskaki², Dmitrii Samoilenko¹, Lucas Schaper², and Johann Zemella² — ¹Universität Hamburg, Hamburg, Germany — ²Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — ³European XFEL, Hamburg, Germany

Free-Electron Lasers (FELs) generate ultrashort, transversely coherent laser pulses through Self-Amplified Spontaneous Emission (SASE). Since SASE starts from the shot noise naturally present in the electron beam, it exhibits poor longitudinal coherence and shot-to-shot fluctuations both in spectrum and intensity. These limitations can be overcome by starting the FEL process deterministically, e.g., by using external seeding. Due to the lack of suitable seed laser sources at short wavelengths, seeding setups employing harmonic conversion are crucial to achieving full coherence in the XUV – X-Ray range. One such scheme is High-Gain Harmonic Generation – HGHG. There, a seed laser induces a coherent modulation of the phase space of the electron beam. Since the modulation contains components at higher harmonics of the seed laser wavelength, it is possible to generate powerful coherent radiation at the short wavelengths. We present analytical and numerical studies based on experimental results obtained at Xseed, the seeding experiment at the FLASH FEL at DESY, Hamburg.

Keywords: FEL; Seeding; HGHG