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Harmonic radiation contribution and X‐ray transmission at the Small Quantum Systems instrument of European XFEL
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Harmonic radiation contribution and X‐ray transmission at the Small Quantum Systems instrument of European XFEL
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Journal Article
Harmonic radiation contribution and X‐ray transmission at the Small Quantum Systems instrument of European XFEL
2023
Overview
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. Measurements of the transmission as well as the contribution of harmonic radiation at the soft X‐ray beamline of the Small Quantum Systems instrument at the SASE3 undulator of European XFEL are presented.
Publisher
International Union of Crystallography,John Wiley & Sons, Inc
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