An XUV optics beamline at BESSY II

TLDR: The collimated plane grating monochromator (PGM-) beamline at a bending magnet is setup at the BESSY-II synchrotron radiation facility within the framework of the blazed-grating production facility as mentioned in this paper.

Abstract: The design for a new XUV-Optics Beamline is presented. The collimated plane grating monochromator (PGM-) beamline at a bending magnet is setup at the BESSY-II synchrotron radiation facility within the framework of the blazed-grating production facility. Coupled to a versatile four-circle (ten ax es) UHV- reflectometer as a permanent end station the whole setup is dedicated to at-wavelength characterizati on and calibration of the in-house produced precision gratings and novel nano-optical devices as well as mirrors, multila yered systems etc. It is also open to exte rnal projects employing reflectometry, spectroscopy or scattering techniques. According to its purpose, this beamline has specific features, such as: very high spectral purity, provided by two independent high order suppression systems, an advanced aperture system for suppression of stray light and scattered radiation, a broad energy range between 10 eV and 2000 eV, small beam divergence and spot size on the sample. Thus this Optics Beamline will become a powerful metrology tool for reflectivity measurements in s- or p-polarisation geometry with linearly or elliptically polarized light on real optics up to 360 mm length and 4 kg weight. Keywords: At-wavelength metrology, UV, EUV, VUV, XUV, reflection gratings, reflectometry, polarimetry, synchrotron instrumentation