The reflectivity beamline is based on a grazing incidence toroidal grating monochromator (TGM) and employs toroidal mirrors for pre- and postfocusing optics. The entire beamline of more than 12 m length is maintained in ultra high vacuum (UHV) and comprises of a variety of hardware including in situ precision alignment devices of optical mirrors, beam diagnostic devices, higher-diffraction-order suppression filters, etc. The experimental station on this beamline is a high vacuum reflectometer that is capable of performing angle and wavelength-dependent reflectivity measurements. In addition to reflectivity measurements, the beamline is designed for multipurpose applications such as, for study of optical properties of materials (metals, semiconductors, thin films, multilayers, etc.) in VUV and soft X-ray regimes.
The schematic of the optical configuration is given in the Figure. This beamline is installed on a 50° port of the bending magnet (BM-2) of Indus-1. The rms. electron source size at this port is 0.8 mm × 0.1 mm (horizontal × vertical). The beamline acceptance is 10 mrad × 5 mrad and the beamline is designed to cover the 40–1000 Å photon wavelength range.