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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 4: Plasmas and Lasers
AKBP 4.2: Group Report
Tuesday, March 21, 2023, 17:00–17:30, CHE/0183
SPEED: Worldwide first implementation of the EEHG scheme at a storage ring — •Carsten Mai1, Benedikt Büsing1, Arne Held1, Shaukat Khan1, Arjun Radha Krishnan1, Wa'el Salah1,2, Zohair Usfoor1, and Vivek Vijayan1 — 1Center for Synchrotron Radiation (DELTA), TU Dortmund University, Dortmund, Germany — 2The Hashemite University, Zarqa, Jordan
At DELTA, a 1.5-GeV synchrotron radiation source at TU Dortmund University, the CHG (coherent harmonic generation) scheme is employed to generate ultrashort radiation pulses. In CHG, the interaction of electron bunches with laser pulses in a first undulator (modulator) causes a periodic electron energy modulation. A chicane then induces a density modulation, giving rise to coherent emission of ultrashort pulses at harmonics of the seed laser in a second undulator (radiator). A reconfiguration of the U250 device that incorporated the two undulators and the chicane went underway in summer 2022 to demonstrate EEHG (echo-enabled harmonic generation, originally proposed for linac-based free-electron lasers) at a storage ring and to enable the generation of higher harmonics. The coils of the U250 were rewired to create two modulators for a twofold laser-electron interaction, two chicanes for the manipulation of the electron density, and a radiator, with only a few undulator periods comprising each section. The produced EEHG pulses are detected by an in-vacuum grating spectrometer. Initial results are presented. To our knowledge, this is the first attempt worldwide to successfully apply EEHG at a storage ring.