Mainz 2022 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 10: Electron Accelerators and FEL’s

AKBP 10.2: Talk

Wednesday, March 30, 2022, 14:15–14:30, AKBP-H14

Simulation Studies on a XUV FEL Oscillator Setup at FLASH — •Margarit Asatrian¹, Wolfgang Hillert¹, Velizar Miltchev¹, and Georgia Paraskaki² — ¹University of Hamburg, 22761 Hamburg, Germany — ²Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany

Externally seeded Free Electron Lasers (FEL) deliver fully coherent radiation at harmonics of the input seed laser wavelength. However, due to the lack of seed laser sources in the EUV/XUV range and at high repetition rates with sufficient peak power, the shortest wavelength and maximum repetition rate of the seeded FEL radiation are limited.

In order to utilize the full potential of superconducting RF technology being exploited in the world leading FEL facilities like FLASH at DESY and enabling bunch repetition rates in the MHz regime for seeding, an oscillator-amplifier approach is considered, where the role of the seed laser is taken by an optical cavity. A cavity tuned to 13.5 nm is used to store the seed pulse and reuse it for the seeding of bunches at MHz rate. The possibility to build up the power in the cavity starting from shot noise allows the seeding at an already short wavelength.

We present design considerations and our first simulation results for the future setup.