Göttingen 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

AKBP: Arbeitskreis Beschleunigerphysik

AKBP 7: Novel Accelerator Concepts II and FELs

AKBP 7.7: Vortrag

Mittwoch, 2. April 2025, 17:45–18:00, ZHG004

High-gain high-efficiency tapered FEL oscillator — •Margarit Asatrian¹, Eugenio Ferrari², Andrew Fisher³, Georgia Paraskaki², Pietro Musumeci³, and Wolfgang Hillert¹ — ¹University of Hamburg, Hamburg, Germany — ²Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — ³University of California at Los Angeles, Los Angeles, California, USA

Free Electron Lasers (FELs) are unique light sources capable of producing intense, high-brightness radiation in the XUV and X-ray regimes. The growing demands of experimental science are pushing FELs to their performance limits in terms of radiation quality and output power. To meet these challenges, it is crucial to explore ways of improving the energy conversion efficiency between the electron beam and the FEL output. Enhanced efficiency could either expand the achievable power range of FELs or enable more compact infrastructures.

The TESSA (Tapering-Enhanced Stimulated Superradiant Amplification) scheme offers a promising solution, with efficiencies more than an order of magnitude higher than those of conventional FELs. This approach employs a strongly tapered undulator and a high-power seed to extract energy from a pre-bunched electron beam. At short wavelengths, however, the absence of suitable high-power seed laser sources calls for the use of cavity-based FELs to generate the required seed. Here, we present FEL simulations that illustrate the power buildup and steady-state regime of such a TESSA-based high-gain FEL oscillator in the XUV wavelength range.

Keywords: FEL oscillator; Tapering; High efficiency; XUV FEL; TESSA