Direct LiF imaging diagnostics on refractive X-ray focusing at the EuXFEL high energy density instrument

0568523 - FZÚ 2024 RIV GB eng J - Journal Article
Makarov, S. - Makita, M. - Nakatsutsumi, M. - Pikuz, T. - Ozaki, N. - Preston, T.R. - Appel, K. - Konopková, Z. - Cerantola, V. - Brambrink, E. - Schwinkendorf, J.P. - Mohacsi, I. - Burian, Tomáš - Chalupský, Jaromír - Hájková, Věra - Juha, Libor - Vozda, Vojtěch - Nagler, B. - Zastrau, U. - Pikuz, S.
Direct LiF imaging diagnostics on refractive X-ray focusing at the EuXFEL high energy density instrument.
Journal of Synchrotron Radiation. Roč. 30, Jan. (2023), s. 208-216. ISSN 0909-0495. E-ISSN 1600-5775
R&D Projects: GA ČR(CZ) GA20-08452S; GA ČR(CZ) GA17-05167s
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Institutional support: RVO:68378271
Keywords : X-ray free-electron lasers * X-ray focusing * X-ray beam characterization * compound refractive lenses * focusing system * lithium fluoride (LiF) detector
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.5, year: 2022
Method of publishing: Open access

The application of fluorescent crystal media in wide-range X-ray detectors provides an opportunity to directly image the spatial distribution of ultraintense X-ray beams including investigation of the focal spot of free-electron lasers. Here the capabilities of the micro- and nano-focusing X-ray refractive optics available at the High Energy Density instrument of the European XFEL are reported, as measured in situ by means of a LiF fluorescent detector placed into and around the beam caustic. The intensity distribution of the beam focused down to several hundred nanometers was imaged at 9 keV photon energy. A deviation from the parabolic surface in a stack of nanofocusing Be compound refractive lenses (CRLs) was found to affect the resulting intensity distribution within the beam. Comparison of experimental patterns in the far field with patterns calculated for different CRL lens imperfections allowed the overall inhomogeneity in the CRL stack to be estimated.
Permanent Link: https://hdl.handle.net/11104/0341768