Optical performance prediction of thin-walled Wolter type 1 mirror shells for X-rays in the 1 to 8 keV energy range

Details Optical performance prediction of thin-walled Wolter type 1 mirror shells for X-rays in the 1 to 8 keV energy range Optical performance prediction of thin-walled Wolter type 1 mirror shells for X-rays in the 1 to 8 keV energy range

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1742..245g&link_type=abstract

In: Multilayer and grazing incidence X-ray/EUV optics for astronomy and projection lithography; Proceedings of the Meeting, San

Physics

Optics

1

Geometrical Optics, Mirrors, Performance Prediction, Thin Walls, X Ray Telescopes, Monte Carlo Method, Point Spread Functions, Ray Tracing, Three Dimensional Models, X Ray Spectroscopy

Scientific paper

The study predicts, on the basis of surface topology measurements, the optical performance of thin-walled Wolter type 1 mirror shells over the specified energy range of the XMM telescope (0.3-8 keV). To analyze the effect of deformations which can be treated by geometrical optics, a Monte Carlo code was developed which uses a 3D model of the telescope to trace individual rays through the telescope. The computed point spread functions are found to be in excellent agreement with the ones measured in a full-aperture test at 1.5 keV X-ray energy. At 8 keV, a loss in optical performance was observed. A comparison of the surface data with mirrors that performed efficiently at 8 keV showed deformations with spatial wavelengths below 1 mm to be responsible for the degradation at 8 keV X-ray energy. It is concluded that in the transition region between Rayleigh limit and smooth surface limit, approximate optical predictions can be achieved by applying geometrical optics.

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