Optical aberrations in a bent-crystal spectrometer

Bryzgunov, V. A.

doi:10.1134/1.1259567

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“…We note that the figure errors of the crystal surface may make a significant contribution to the geometrical energy broadening and they may increase with increasing radius r. In this case, a mask will help to select the part of the crystal surface with the smallest figure error. A toroidal analyser shape could reduce or eliminate the energy broadening outside the scattering plane (Bryzgunov, 2000;Jahrman et al, 2019). However, the required bending radius in the sagittal plan depends on the Bragg angle (see below).…”

Section: Figurementioning

confidence: 99%

The five-analyzer point-to-point scanning crystal spectrometer at ESRF ID26

Glatzel¹,

Harris²,

Marion³

et al. 2021

J Synchrotron Rad

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X-ray emission spectroscopy in a point-to-point focusing geometry using instruments that employ more than one analyzer crystal poses challenges with respect to mechanical design and performance. This work discusses various options for positioning the components and provides the formulas for calculating their relative placement. Ray-tracing calculations were used to determine the geometrical contributions to the energy broadening including the source volume as given by the beam footprint on the sample. The alignment of the instrument is described and examples are given for the performance.

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Section: Figurementioning

confidence: 99%