This paper discusses several optical elements now in use at BL43LXU, the RIKEN Quantum NanoDynamics Beamline, of the RIKEN SPring-8 Center. BL43LXU is dedicated to meV-resolved inelastic x-ray scattering (IXS) using spherical analyzers operating between 15.8 and 25.7 keV. The work described here is relevant for setups on the high-resolution spectrometer (10m two-theta arm) with resolution between 2.8 and 0.8 meV. Specific optics discussed include a multilayer Kirkpatrick-Baez (KB) mirror pair that focuses the full (∼lx3mm2) beam at 17.79 keV to a 4.4 X 4.1 μm2 spot with ~60% throughput, two different types of Soller slits that help reduce backgrounds, masks for the analyzers that allow increased solid angle to be collected while preserving momentum resolution, and a diamond quadrant beam position monitor (BPM). These elements have been used for experiments in extreme conditions with diamond anvil cells, and liquid measurements at low momentum transfers, among other work.
Auxiliary optics for meV-resolved inelastic x-ray scattering at SPring-8: Microfocus, analyzer masks, Soller slit, soller screen, and beam position monitor
Alfred Q. R. Baron, Daisuke Ishikawa, Hiroshi Fukui, Yoichi Nakajima; Auxiliary optics for meV-resolved inelastic x-ray scattering at SPring-8: Microfocus, analyzer masks, Soller slit, soller screen, and beam position monitor. AIP Conf. Proc. 15 January 2019; 2054 (1): 020002. https://doi.org/10.1063/1.5084562
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