11 March 2003 Concept of the ROSITA x-ray camera
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Abstract
The main scientific objective of the ROSITA mission is to extend the X-ray all-sky survey of ROSAT to higher energies to gain an unbiased sample of all types of celestial X-ray sources in the medium energy band. During this mission the whole sky will be scanned by seven imaging X-ray telescopes. The telescopes have different viewing directions with an offset angle between 4 and 6 deg. The focal plane instrumentation of the telescopes is based on a novel type of pn-CCD with a frame store, an advanced version of the pn-CC operating quite successfully on XMM-Newton. The pixel size is adapted to the mirror resolution and the fast readout time guaranties the required angular accuracy despite the scan motion. The X-ray camera carries seven separate CCDs arranged on a circle in the foci of the Wolter type I mirror systems of the seven telescopes. The CCDs are mounted on ceramic frames, which carry dedicated front-end electronics for each CCD. The CCDs are operated at a temperature of-80 deg C. Except for the entrance window, the CCDs are covered by graded shielding for suppression of fluorescent X-ray background, generated by cosmic rays in the surrounding materials. Filters in front of the the CCDs, inhibit optical and UV photons. For in-orbit calibration a radioactive source producing fluorescent X-rays in the desired energy band is provided. We will give an overview of the mechanical, thermal and electrical concept of the camera system.
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Elmar Pfeffermann, S. Bonerz, Heinrich W. Braeuninger, Ulrich G. Briel, Peter Friedrich, Robert Hartmann, Gisela D. Hartner, Gunther Hasinger, Horst Hippmann, Eckhard Kendziorra, Guenther Kettenring, Walter Kink, Norbert Meidinger, Siegfried Mueller, Peter Predehl, Heike Soltau, Lothar Strueder, Joachim E. Truemper, "Concept of the ROSITA x-ray camera", Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461167; https://doi.org/10.1117/12.461167
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