Journal Article

PUBDB-2021-03411

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High repetition rate seeded FEL with an optical klystron in high-gain harmonic generation

Paraskaki, G. (Corresponding author)DESY* ; Allaria, E.DESY* ; Schneidmiller, E. A.XFEL.EU*DESY* ; Hillert, W.CFEL*Extern*

2021
American Physical Society College Park, MD

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Please use a persistent id in citations: doi:10.1103/PhysRevAccelBeams.24.120701  doi:10.3204/PUBDB-2021-03411

Abstract: Many high-gain FELs worldwide are planning to incorporate seeding setups into their day-to-day operation. These techniques provide both longitudinal and transverse coherence and extendedcontrol of the output FEL spectral properties. However, the output wavelength and repetition ratestrongly depend on the properties of the seed laser system. With the laser peak power requiredfor successful seeded operation, it is currently not possible to increase their repetition rate to anextent that it matches the electron bunch repetition rate of superconducting accelerators. Here, weinvestigate the advantages of a modification of standard seeding setups, by combining the seedingwith the so-called optical klystron. With this new seeding setup it is possible to decrease the seedlaser power requirements and therefore, seed laser systems can increase their repetition rate at thesame wavelength. We show simulation results in a high-gain harmonic generation (HGHG) setupfor a range of harmonics (8th to 15th) and we verify the reduction of seed laser power required withan Optical Klystron (OK) HGHG. Finally, we comment on the stability of the proposed setup tojitter sources and to shot to shot fluctuations and compare to the standard HGHG scheme.

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Contributing Institute(s):

1. FS-FLASH (FS-FLASH)
2. Beschleunigerphysik (MPY)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)

Experiment(s):

1. Facility (machine) FLASH
2. FLASH 2020+ Project

Appears in the scientific report 2021

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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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