Design of Grazing Incident Monochromator for Saga Synchrotron Light

摘要

The Varied Line Spacing Plane Grating Monochromator (VLSPGM) was adopted for industry application beamline at Saga-ring. The VLSPGM is consisted of three focusing mirrors and one grating to suppress the higher order and stray light in the wide energy range by changing the deflection angle. The parameters of varied line spacing grating were determined so as to satisfy the condition that the terms expressing defocus, coma and spherical aberrations in the optical path function are equal to zero. The overall performance of the VLSPGM was estimated using ray-tracing calculations. The calculated resolving power with the slit widths of 10 and 20 μm was more than 5,000 and 2,000 with the photon flux of more than 1×10~(10) and 6×10~(10) photons/sec/300mA, respectively.