Proceedings

PUBDB-2024-08096

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Generation of Short Wavelength at Variable Polarization in FLASH2

Rönsch-Schulenburg, J. (Corresponding author)DESY* ; Braune, M.XFEL.EU*DESY* ; Brenner, G.DESY* ; Dziarzhytski, S.DESY* ; Honkavaara, K.DESY* ; Kuhlmann, M.DESY* ; Niknejadi, P.DESY* ; Schaper, L.Extern*DESY* ; Schneidmiller, E. A.DESY* ; Schoeps, A.DESY* ; Schreiber, S.DESY* ; Tischer, M.DESY* ; Treusch, R.DESY* ; Vagin, P.DESY* ; Vogt, M.DESY* ; Zemella, J.DESY*

2024

Abstract: FLASH, the world’s first XUV and soft X-ray freeelectron laser is a user facility since 2005 and operates two SASE beamlines in parallel: FLASH1 and FLASH2, since 2014. In the FLASH2 main undulator beamline radiation down to 3.2 nm wavelength in the fundamental has been demonstrated. In order to efficiently generate soft X-ray radiation at the third harmonic of the FLASH2 main undulator wavelength with tunable polarization, an additional APPLE-III type undulator has been installed downstream of the FLASH2 SASE undulator section. This so-called afterburner allows one to reach wavelengths down to 1.33 nm with selectable polarization. The afterburner undulator also serves as a full-scale prototype for the FLASH1 seeding radiators to be installed in 2025. This paper describes the successful commissioning with beam, the demonstration of the amplification of the third harmonic and the generation of different polarizations and operation of the afterburner undulator.

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Contributing Institute(s):

1. Maschinen Koordination FLASH (MFL)
2. FS-Undulator Systeme (FS-US)

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

Appears in the scientific report 2024

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