A variable fixed-focus constant optimization method for a variable-included-angle varied-line-spacing plane-grating monochromator

Variable-included-angle varied-line-spacing plane-grating monochromators (VIA-VPGM) have been applied to many beamlines because of the self-focusing and aberration-correction function of the varied-line-spacing grating. Unfortunately, to optimize the variable-line-spacing coefficient of the grating, the fixed-focus constant (Cff) has to be fixed first in the VIA-VPGM. In this way, some of the advantages of these monochromators are lost, such as the flexibility of choosing a different energy-resolving power by varying the Cff. In this work, a variable Cff optimization method is introduced for a VIA-VPGM. By adopting this method, the Cff could be arbitrarily selected in the VIA-VPGM.

Source: Journal of Synchrotron Radiation - June 3, 2019 Category: Physics Authors: Xue, C. Xue, L. Wu, Y. Wang, Y. Yang, S. Tai, R. Tags: synchrotron radiation variable-included-angle varied-line-spacing plane-grating monochromators VIA-VPGM variable Cff research papers Source Type: research