Journal Article

PUBDB-2023-01949

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Generation of Ultrashort Pulses in XUV and X-ray FELs via an Excessive Reverse Undulator Taper

Schneidmiller, E. A. (Corresponding author)XFEL.EU*DESY* ; Dreimann, M.Extern*XFEL.EU* ; Kuhlmann, M.DESY* ; Rönsch-Schulenburg, J.DESY* ; Zacharias, H.Extern*

2023
MDPI Basel

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Please use a persistent id in citations: doi:10.3390/photonics10060653  doi:10.3204/PUBDB-2023-01949

Abstract: The pulse duration in short-pulse schemes for Self-Amplified Spontaneous Emission Free Electron Lasers (SASE FELs) is limited by the FEL coherence time. A recently proposed concept allows to overcome the coherence time barrier and to get much shorter pulses. When the lasing part of an electron bunch is much shorter than the coherence time, one can suppress the radiation in the long main undulator while preserving microbunching within that short lasing slice. Then a short radiation pulse is produced in a relatively short radiator. A possible suppression method, an excessive reverse undulator taper, is discussed and illustrated numerically in this paper. We also performed first experimental tests of this method at the soft X-ray FEL user facility FLASH. The measured pulse duration approaches 1 fs (FWHM) at the wavelength of 5 nm.

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Contributing Institute(s):

1. Beschleunigerphysik (MPY)
2. FS-FLASH (FS-FLASH)
3. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
4. DOOR-User (DOOR ; HAS-User)
5. Maschinen Koordination FLASH (MFL)

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) FLASH2

Appears in the scientific report 2023

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF < 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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