Lessons learned from the stray-light analysis of the XMM telescope

Details Lessons learned from the stray-light analysis of the XMM telescope Lessons learned from the stray-light analysis of the XMM telescope

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3113..321p&link_type=abstract

Proc. SPIE Vol. 3113, p. 321-333, Grazing Incidence and Multilayer X-Ray Optical Systems, Richard B. Hoover; Arthur B. Walker; E

Astronomy and Astrophysics

Astronomy

Scientific paper

The European Space Agency (ESA) X-Ray Mirror Module (XMM) telescope is a set of three multiple shell grazing incidence Wolter Type I telescopes that will study astronomical x-ray sources from Earth orbit. There are a total of 58 nested mirror shells within each telescope. Each shell consists of a paraboloid primary and hyperboloid secondary that together focus x rays that are incident at grazing incidence onto a detector, known as the EPIC. Two of the telescopes also have grazing incidence diffraction gratings that disperse a portion of the focused x rays across a second detector, known as the RFC. The complex geometry of XMM makes stray light design and analysis of this telescope a unique and difficult challenge. The fundamental problem is that the detectors collecting the x-rays are also sensitive to visible and near-infrared radiation from outside sources such as the Sun and the Earth. This paper is an overview of the approach used to perform a stray light analysis of this visible radiation, and a presentation of four of the stray light problems that are unique to XMM and related grazing incidence telescopes. For each problem, a summary of the technique that was used to calculate the magnitude of the stray light is given.

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