HIGH-RESOLUTION SOFT-X-RAY MONOCHROMATORS OF NEW DESIGN

We have applied the principle of sagittal focusing to obtain high-resolution soft-X-ray monochromators for application to undulators, as planned for the new generation of synchrotron radiation facilities. Grazing incidence optical configurations (like Czerny-Turner and those utilizing a grating with variable line spacing) are particularly attractive. These configurations have the advantage of using fixed entrance and exit slits. We have analyzed such configurations using sagittal focusing and have shown that the resolution obtainable is comparable with that of a spherical grating monochromator of similar size (which, by contrast, needs moving entrance and exit slits). © 1990.