Journal Article

PUBDB-2026-01092

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Startup regime of high-efficiency tapering-enhanced FEL oscillator

Asatrian, M.Extern* ; Hillert, W.CFEL*Extern* ; Ferrari, E.DESY* ; Fisher, A. ; Musumeci, P.

2026
American Physical Society College Park, MD

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Please use a persistent id in citations: doi:10.1103/zgmq-8xkd

Abstract: In this paper, we present a design of a high-efficiency high-gain free-electron laser oscillator based on the use of a strongly tapered undulator for extracting energy from high-brightness electron beams. We provide an analytical model of the setup followed by numerical simulations for lasing at the wavelength of 13.5 nm. We discuss the optimization of the system in steady state and the conditions necessary for the pass-per-pass buildup of the power from shot noise level. We propose the use of fast phase shifters as a way to accelerate the buildup. Finally, we present time-dependent simulations of the oscillator and discuss the role of spectral filtering. The optimized working point yields a total energy conversion efficiency from the electron beam to output radiation above 1% at the wavelength of 13.5 nm.

Note: cc-by

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Contributing Institute(s):

1. Beschleunigerphysik (MPY)

Research Program(s):

1. 05K22GUE - Erzeugung von schmalbandiger kohärenter XUV-Strahlung mit MHz-Repetitionsrate mittels resonatorbasiertem Seeding (BMBF-05K22GUE) (BMBF-05K22GUE)
2. 621 - Accelerator Research and Development (POF4-621) (POF4-621)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2026

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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