Harmonic radiation contribution and X-ray transmission at the Small Quantum Systems instrument of European XFEL.

Autor:	Baumann TM; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Boll R; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., De Fanis A; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Grychtol P; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Ilchen M; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Jastrow UF; Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany., Kato M; National Institute of Advanced Industrial Science and Technology (AIST), NMIJ, Tsukuba 305-8568, Japan., Lechner C; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Maltezopoulos T; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Mazza T; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Montaño J; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Music V; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Ovcharenko Y; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Rennhack N; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Rivas DE; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Saito N; National Institute of Advanced Industrial Science and Technology (AIST), NMIJ, Tsukuba 305-8568, Japan., Schmidt P; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Serkez S; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Sorokin A; Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany., Usenko S; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Yan J; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Geloni G; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany., Tanaka T; National Institute of Advanced Industrial Science and Technology (AIST), NMIJ, Tsukuba 305-8568, Japan., Tiedtke K; Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany., Meyer M; European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany.
Jazyk:	angličtina
Zdroj:	Journal of synchrotron radiation [J Synchrotron Radiat] 2023 Jul 01; Vol. 30 (Pt 4), pp. 662-670. Date of Electronic Publication: 2023 May 10.
DOI:	10.1107/S1600577523003090
Abstrakt:	Transmission measurements of the soft X-ray beamline to the Small Quantum Systems (SQS) scientific instrument at the SASE3 undulator of European XFEL are presented. Measurements are reported for a wide range of photon energies (650 eV to 2400 eV), using X-ray gas monitors as well as a bolometric radiometer. The results are in good agreement with simulations for the beam transport and show a transmission of up to 80% over the whole photon energy range. The contribution of second- and third-harmonic radiation of the soft X-ray undulator is determined at selected photon energies by performing transmission measurements using a gas absorber to provide variable attenuation of the incoming photon flux. A comparison of the results with semi-analytic calculations for the generation of free-electron laser pulses in the SASE3 undulator reveals an influence of apertures along the beam transport on the exact harmonic content to be accounted for at the experiment. The second-harmonic content is measured to be in the range of 0.1% to 0.3%, while the third-harmonic contributed a few percent to the SASE3 emission. For experiments at the SQS instrument, these numbers can be reduced through specific selections of the mirror reflection angles. (open access.)
Databáze:	MEDLINE
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