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Figure 12
Comparison of OPIS and PG spectrometer results of a wavelength-monitoring measurement at a set value of [\lambda_{\rm{FLASH}}] = 11.6 nm. (a) Wavelength values of a series of 400 FLASH pulses are shown, which, due to the FLASH repetition rate of 10 Hz, corresponds to 40 s of FEL operation. For each light pulse the average wavelength value of an interval of the last 20 shots has been determined. In the plot this average value has been attributed to the mid-shot of the 20-shot interval, i.e. the 11th shot. Thick yellow curve: OPIS moving average values derived from the Xe 4d signal of a 20-shot average spectrum. Thick blue curve: PGS moving average of 20 wavelength values derived from single-shot spectra. Thin blue curve: PGS single-shot wavelength values. (b) OPIS versus PGS results shown in a correlation plot. According to an analysis of Xe Auger electron lines, the OPIS wavelength scale had to be corrected by [\Delta\lambda] = −0.028 nm. (c) Example of a 20-shot average spectrum for shots #228 to #247, zoomed to the Xe 4d photoelectron doublet. The green curve shows the profile fit of the wavelength determination procedure.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 10-20
doi:10.1107/S1600577515022675
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