We present a spectrometer setup based on grating dispersion for hard x-ray free-electron lasers. This setup consists of a focusing spectrometer grating and a charge-integrating microstrip detector. Measurement results acquired at Linac Coherent Light Source are presented, demonstrating noninvasive monitoring of single-shot spectra with a resolution of 2.0 × 10~(-4) ± 0.3 × 10~(-4) at photon energy of 6 keV with more than 95% transmission of the main beam.
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