Henriksen, P.L.; Christensen, F.E.; Massahi, S.; Ferreira, D.D.M.; Svendsen, S.; Gellert, N.; Jegers, A.S.; Sokolov, A.; Shortt, B.: Design, performance, and utilization of the Low-Energy X-ray Reflectometer at DTU space. Journal of Astronomical Telescopes, Instruments, and Systems 7 (2021), p. 048004/1-19
10.1117/1.jatis.7.4.048004
Open Access Version (externer Anbieter)
Abstract:
A state-of-the-art compact Low-Energy X-ray Reflectometer is in operation at DTU Space and is used to characterize x-ray coatings for the optics of future spaceborne and ground- based telescopes. The reflectometer is housed in a vacuum chamber and operates at 1.487 keV, complimenting an existing 8.048 keV reflectometer. With a microfocus source and plane- parabolic Kirkpatrick–Baez mirrors, the 0.5-mm wide beam is collimated to < 0.75 arcmin. An actively cooled 2D CCD yields sample alignment precision of 26 μm in linear position and 0.18 arcmin in angle. A multilayer monochromator provides a peak reflectance of 43.5% and beam purity > 99%. The reflectometer has a 2θ range of 0 deg to 35 deg and dynamic range up to eight orders of magnitude. Techniques are demonstrated to investigate the sample surface mor- phology and we show the system’s capability to detect the presence of atmospheric contaminants on coated mirrors.