XMM flight model mirror effective area measurements

Abstract

The high throughput X-ray Spectroscopy Mission XMM is a "Cornerstone" project of the ESA Horizon 2000 Science Programme. The optical heart of this satellite consists in 3 Mirror Assemblies (MA). Each MA includes a Mirror Module (MM) containing 58 X-ray optical quality Mirror Shells (MS) and an X-ray baffle (XRB) which reduces straylight. Two of the three MAs are equipped with a Reflection Grating Assembly (RGA) for spectral analysis. Tests are performed in the CSL FOCALX facility. The goal of the presented tests is to evaluate the X-ray effective area of a MM. These tests are accomplished in a vertical configuration. An X-ray pencil beam is used for X-ray reflectivity measurements at Al, Au, Cu and Mo lines between 1.5 and 13 keV. A partial illumination collimated X-ray beam with a C continuous spectrum allows to measure the effective area of the MM over a 1 .5 -9 keV range. This paper gives a short description of the tested specimens, and presents the test configuration in CSL Focal X facility. The paper focuses on a complete and original way to work out experimentally effective areas of an X-ray telescope. Analysis of the achieved results is carried out.

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