Journal Article

PUBDB-2023-03447

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Two-Color Operation of a Soft X-ray FEL with Alternation of Undulator Tunes

Schneidmiller, E. A. (Corresponding author)XFEL.EU*DESY* ; Bermudez Macias, I. J.Extern*XFEL.EU*DESY* ; Beye, M.XFEL.EU*DESY* ; Braune, M.XFEL.EU*DESY* ; Czwalinna, M. K.DESY* ; Düsterer, S.XFEL.EU*DESY* ; Faatz, B.Extern* ; Ivanov, R.XFEL.EU* ; Jastrow, U. F.XFEL.EU*DESY* ; Kuhlmann, M.DESY* ; Rönsch-Schulenburg, J.DESY* ; Schreiber, S.DESY* ; Sorokin, A.Extern*XFEL.EU* ; Tiedtke, K.XFEL.EU*DESY* ; Yurkov, M.XFEL.EU*DESY* ; Zemella, J.DESY*

2023
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Please use a persistent id in citations: doi:10.3390/app13010067  doi:10.3204/PUBDB-2023-03447

Report No.: DESY-22-180; arXiv:2211.07426

Abstract: FLASH is the first soft X-ray FEL user facility, routinely providing brilliant photon beams for users since 2005. The second undulator branch of this facility, FLASH2, is gap-tunable, which allows for testing and using advanced lasing concepts. In particular, we developed a two-color operation mode based on the alternatingly tuned undulator segments (every other segment is tuned to the second wavelength). This scheme is advantageous in comparison with a subsequent generation of two colors in two consecutive sections of the undulator line. First, source positions of the two FEL beams are close to each other which makes it easier to focus them on a sample. Second, the amplification is more efficient in this configuration since the segments with respectively “wrong” wavelength still act as bunchers. We studied operation of this scheme in the regime of small and large separation of tunes (up to a factor of two). We developed new methods for online intensity measurements of the two colors simultaneously that require a combination of two detectors. We also demonstrated our capabilities to measure spectral and temporal properties of two pulses with different wavelengths.

Keyword(s): free-electron lasers ; SASE ; two-color operation ; photon diagnostics

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Contributing Institute(s):

1. Beschleunigerphysik (MPY)
2. Strahlkontrollen (MSK)
3. FS-FLASH (FS-FLASH)
4. 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) FLASH
2. Facility (machine) FLASH2

Appears in the scientific report 2023

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Schneidmiller, E. A. (Corresponding author)XFEL.EU*DESY* ; Macias, I. J. B. ; Beye, M.XFEL.EU*DESY* ; Braune, M.XFEL.EU*DESY* ; Czwalinna, M.-K.DESY* ; Duesterer, S.XFEL.EU*DESY* ; Faatz, B.Extern* ; Ivanov, R.XFEL.EU* ; Jastrow, F.XFEL.EU*DESY* ; Kuhlmann, M.DESY* ; Roensch-Schulenburg, J.DESY* ; Schreiber, S.DESY* ; Sorokin, A. ; Tiedtke, K.XFEL.EU*DESY* ; Yurkov, M. V.XFEL.EU*DESY* ; Zemella, J.DESY*
Two-color operation of a soft x-ray FEL with alternation of undulator tunes
[10.3204/PUBDB-2022-06650]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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