Abstract
The transmission of the optical components of the Bernina branch of the Aramis beamline at SwissFEL has been measured with an X-ray gas monitor from DESY and compared with a PSI gas detector upstream of the optical components. The transmission efficiencies of the Mo, Si and SiC mirror coatings of the Aramis beamline and the various other in-beam components were evaluated and compared with theoretical calculations, showing an agreement of 6% or better in all cases. The experiment has also shown the efficacy of the high-harmonic rejection mirrors at the Bernina branch of the Aramis beamline atSwissFEL, and characterized the transmission efficiency of the on-line spectrometer in the Aramis beamline. The theoretical transmission of the mirror coatings match the experimental data to within 7%. The accuracy of these measurements was checked against a radiative bolometer from a Japanese collaboration and found to agree to a level of 4% or better. Further comparisons with a diamond detector from a US-based inter-institute collaboration demonstrated a good agreement for the attenuator settings of the beamline.
Highlights
The Swiss Free Electron Laser (SwissFEL) (Milne et al, 2017) is the newest hard X-ray FEL facility open to users
This paper presents the measurements of the transmission of the Bernina branch of the SwissFEL Aramis beamline
The diamond detector was removed from the beam for the photon beam intensity gas (PBIG)/X-ray gas monitor (XGM)/radiometer comparison measurements, and was separately used in tandem with the XGM and with the always-on PBIG for the calibration of the attenuators
Summary
The Swiss Free Electron Laser (SwissFEL) (Milne et al, 2017) is the newest hard X-ray FEL facility open to users. The transmission efficiencies of the Mo, Si and SiC mirror coatings of the Aramis beamline and the various other in-beam components were evaluated and compared with theoretical calculations, showing an agreement of 6% or better in all cases.
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