OPTICAL DESIGN OF A TOROIDAL GRATING MONOCHROMATOR BASED BEAM LINE ONINDUS-1

In this paper, we discuss the detailed optical design of a beam line t hat is under construction on the synchrotron radiation source, Indus-1 . Toroidal mirrors are used as pre and post- focusing elements and a t oroidal grating monochromator as a dispersing element. Using three int erchangeable gratings, this monochromator will give, at a moderate res olution, a good throughput on the sample in the wavelength range 40 to 1000 Angstrom. Effect of various parameters and their optimization on the resolution and throughput characteristics have been studied by ra y tracing calculations, and presented.