OPTICAL DESIGN OF AN EXTENDED RANGE PLANE GRATING MONOCHROMATOR FOR ABENDING MAGNET BEAMLINE

This paper describes the conceptual design of a bending magnet synchro tron radiation beamline based on a double-incidence plane grating mono chromator. One of the bending magnets of the ELETTRA storage ring has been considered as a reference source assuming a beam energy of 1.5 Ge V and a stored current of 400 mA. The monochromator covers the energy range from 6 eV to 200 eV, with three gratings (one in normal incidenc e and two in grazing incidence condition) achieving a resolving power of the order of 10000 and delivering a photon flux of approximately 10 (13) [photons/s/1% bandwidth]. The image dimensions onto the sample ar e 0.5x1 mm.