Journal Article

PUBDB-2024-01281

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Comparison of wavefront sensing and ablation imprinting for FEL focus diagnostics at FLASH2

Keitel, B. (Corresponding author)DESY* ; Chalupsky, J.Extern*XFEL.EU* ; Jelinek, S.Extern*XFEL.EU* ; Burian, T.Extern*XFEL.EU* ; Dziarzhytski, S.DESY* ; Hajkova, V.Extern*XFEL.EU* ; Juha, L.Extern* ; Kuglerova, Z.Extern* ; Kuhlmann, M.DESY* ; Mann, K.Extern* ; Ruiz Lopez, M.DESY* ; Schaefer, B.Extern* ; Vozda, V.Extern*XFEL.EU* ; Wodzinski, T.XFEL.EU* ; Yurkov, M.XFEL.EU*DESY* ; Ploenjes-Palm, E.DESY*

2024
Optica Washington, DC

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Please use a persistent id in citations: doi:10.1364/OE.527418  doi:10.3204/PUBDB-2024-01281

Abstract: Extreme ultraviolet (EUV) photon beam characterisation techniques, Hartmann wavefront sensing and single shot ablation imprinting, were compared along the caustic of a tightly focused free-electron laser (FEL) beam at beamline FL24 of FLASH2, the Free-electron LASer in Hamburg at DESY. The transverse coherence of the EUV FEL was determined by a Young’s double pinhole experiment and used in a back-propagation algorithm which includes partial coherence to calculate the beam intensity profiles along the caustic from the wavefront measurements. A very good agreement of the profile structure and size is observed for different wavelengths between the back-propagated profiles, an indirect technique, and ablation imprints. As a result, the Hartmann wavefront sensor including its software MrBeam is a very useful, single shot pulse resolved and fast tool for non-invasive determination of focal spot size and shape and also for beam profiles along the caustic.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. FLASH Photonen-Strahlführungen und Optiken (FS-FLASH-B)
3. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)
3. CALIPSOplus - Convenient Access to Light Sources Open to Innovation, Science and to the World (730872) (730872)

Experiment(s):

1. FLASH2 Beamline FL24 (FLASH2)

Appears in the scientific report 2024

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Database coverage:
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