A new extra-focus monochromator designed for high-performance VUV beamlines

A new monochromator called an extra-focus constant-included-angle varied-line-spacing (VLS) cylindrical-grating monochromator (extra-focus CIA-VCGM) is described. This monochromator is based on the Hettrick–Underwood scheme where the plane VLS grating is replaced by a cylindrical one in order to zero the defocus at three reference photon energies in the vacuum-ultraviolet range. It has a simple mechanical structure and a fixed focus spot with high performance over a wide energy range. Furthermore, its mechanical compatibility with a standard VLS plane-grating monochromator allows convenient extension into the soft-X-ray range.

Source: Journal of Synchrotron Radiation - January 28, 2015 Category: Physics Authors: Xue, C.Wu, Y.Zou, Y.Xue, L.Wang, Y.Xu, Z.Tai, R. Tags: VUV beamline monochromator research papers Source Type: research