Journal Article

PUBDB-2019-02574

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Wavefront sensing at X-ray free-electron lasers

Seaberg, M. (Corresponding author) ; Cojocaru, R. ; Berujon, S. ; Ziegler, E.Extern*XFEL.EU* ; Jaggi, A. ; Krempasky, J. ; Seiboth, F.DESY* ; Aquila, A.Extern* ; Liu, Y. ; Sakdinawat, A.Extern* ; Lee, H. J.Extern* ; Flechsig, U.Extern* ; Patthey, L.Extern* ; Koch, F.Extern* ; Seniutinas, G.Extern* ; David, C.Extern* ; Zhu, D. ; Mikeš, L.XFEL.EU* ; Makita, M.XFEL.EU* ; Koyama, T. ; Mancuso, A. P.CFEL*EMBL*DESY* ; Chapman, H.CFEL*DESY* ; Vagovic, P. (Corresponding author)CFEL*DESY*

2019
Wiley-Blackwell Chester

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Please use a persistent id in citations: doi:10.1107/S1600577519005721  doi:10.3204/PUBDB-2019-02574

Abstract: Here a direct comparison is made between various X-ray wavefront sensing methods with application to optics alignment and focus characterization at X-ray free-electron lasers (XFELs). Focus optimization at XFEL beamlines presents unique challenges due to high peak powers as well as beam pointing instability, meaning that techniques capable of single-shot measurement and that probe the wavefront at an out-of-focus location are desirable. The techniques chosen for the comparison include single-phase-grating Talbot interferometry (shearing interferometry), dual-grating Talbot interferometry (moiré deflectometry) and speckle tracking. All three methods were implemented during a single beam time at the Linac Coherent Light Source, at the X-ray Pump Probe beamline, in order to make a direct comparison. Each method was used to characterize the wavefront resulting from a stack of beryllium compound refractive lenses followed by a corrective phase plate. In addition, difference wavefront measurements with and without the phase plate agreed with its design to within λ/20, which enabled a direct quantitative comparison between methods. Finally, a path toward automated alignment at XFEL beamlines using a wavefront sensor to close the loop is presented.

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Contributing Institute(s):

1. FS-PETRA (FS-PETRA)
2. FS-CFEL-1 (Group Leader: Henry Chapman) (CFEL-I)

Research Program(s):

1. 6214 - Nanoscience and Materials for Information Technology (POF3-621) (POF3-621)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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