A compact and versatile tender X-ray single-shot spectrometer for online XFEL diagnostics

One of the remaining challenges for accurate photon diagnostics at X-ray free-electron lasers (FELs) is the shot-to-shot, non-destructive, high-resolution characterization of the FEL pulse spectrum at photon energies between 2   keV and 4   keV, the so-called tender X-ray range. Here, a spectrometer setup is reported, based on the von Hamos geometry and using elastic scattering as a fingerprint of the FEL-generated spectrum. It is capable of pulse-to-pulse measurement of the spectrum with an energy resolution ( Δ E/E) of 10 − 4, within a bandwidth of 2%. The Tender X-ray Single-Shot Spectrometer (TXS) will grant to experimental scientists the freedom to measure the spectrum in a single-shot measurement, keeping the transmitted beam undisturbed. It will enable single-shot reconstructions for easier and faster data analysis.

Source: Journal of Synchrotron Radiation - December 6, 2017 Category: Physics Authors: Rehanek, J. Milne, C.J. Szlachetko, J. Czapla-Masztafiak, J. Schneider, J. Huthwelker, T. Borca, C.N. Wetter, R. Patthey, L. Jurani ć , P. Tags: free-electron laser tender X-ray spectroscopy single-shot measurement research papers Source Type: research