Design and analysis of the reflection grating arrays for the X-ray Multi-Mirror Mission (XMM)

Astronomy and Astrophysics – Astronomy

Scientific paper

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Diffraction Patterns, Mirrors, Spectrometers, X Ray Diffraction, X Ray Telescopes, Charge Coupled Devices, Design Analysis, Rowland Circles, X Ray Astronomy

Scientific paper

The Reflection Grating Spectrometer Experiment which has been selected for flight on the European Space Agency's X-Ray Multi-Mirror Mission includes two arrays of reflection gratings that are placed in the X-ray optical path behind two separate grazing incidence X-ray telescopes. Each of the grating arrays picks off roughly half the X-ray light emanating from its telescope and diffracts it to a dedicated strip of charge-coupled device detectors offset from the telescope focal plane. The arrays contain 224 100 x 200 mm gratings, each mounted at a graze angle of 1.58 deg to the incident beam. The gratings are produced by epoxy replication of a common master onto very thin substrates. Both the gratings and the detectors are mounted on a Rowland circle which also includes the telescope focus. The current state of both the engineering and the optical designs for the grating arrays is reviewed.

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