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The soft X-ray monochromator at the SASE3 beamline of the European XFEL: from design to operation

Authors :
N. Gerasimova
D. La Civita
L. Samoylova
M. Vannoni
R. Villanueva
D. Hickin
R. Carley
R. Gort
B. E. Van Kuiken
P. Miedema
L. Le Guyarder
L. Mercadier
G. Mercurio
J. Schlappa
M. Teichman
A. Yaroslavtsev
H. Sinn
A. Scherz
Source :
Journal of Synchrotron Radiation, Vol 29, Iss 5, Pp 1299-1308 (2022)
Publication Year :
2022
Publisher :
International Union of Crystallography, 2022.

Abstract

The SASE3 soft X-ray beamline at the European XFEL has been designed and built to provide experiments with a pink or monochromatic beam in the photon energy range 250–3000 eV. Here, the focus is monochromatic operation of the SASE3 beamline, and the design and performance of the SASE3 grating monochromator are reported. The unique capability of a free-electron laser source to produce short femtosecond pulses of a high degree of coherence challenges the monochromator design by demanding control of both photon energy and temporal resolution. The aim to transport close to transform-limited pulses poses very high demands on the optics quality, in particular on the grating. The current realization of the SASE3 monochromator is discussed in comparison with optimal design performance. At present, the monochromator operates with two gratings: the low-resolution grating is optimized for time-resolved experiments and allows for moderate resolving power of about 2000–5000 along with pulse stretching of a few to a few tens of femtoseconds RMS, and the high-resolution grating reaches a resolving power of 10 000 at the cost of larger pulse stretching.

Details

Language :
English
ISSN :
16005775
Volume :
29
Issue :
5
Database :
Directory of Open Access Journals
Journal :
Journal of Synchrotron Radiation
Publication Type :
Academic Journal
Accession number :
edsdoj.5d9fec2a867146fd978db251976bd050
Document Type :
article
Full Text :
https://doi.org/10.1107/S1600577522007627