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Proceedings Paper

Experimental verification of a micrometeoroid damage in the pn-CCD camera system aboard XMM-Newton
Author(s): Norbert Meidinger; Bernd Aschenbach; Heinrich W. Braeuninger; Gerhard Drolshagen; Jakob Englhauser; Robert Hartmann; Gisela D. Hartner; Ralf Srama; Lothar Strueder; Martin Stuebig; Joachim E. Truemper
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Paper Abstract

The pn-CCD is the focal plane detector of one of the three X-ray telescopes aboard the XMM-Newton observatory. During revolution #156 more than 30 individual bright pixels lightened up out of approximately 150,000 pixels of the 6 cm × 6 cm large detector area. The amount of leakage current generated in the pixels cannot be explained by single heavy ions impact, however. We suggest that a micrometeoroid scattered off the mirror surface under grazing incidence reached the focal plane detector and produced the bright pixels. This proposal was studied by us experimentally at the Heidelberg dust accelerator. Micron-sized iron particles were accelerated to speeds of the order of 5 km/s impinging on the surface of an X-ray mirror under grazing incidence. Scatter products have been found with detectors placed behind the mirror. They have been analyzed by various methods to characterize their properties and the effects produced by them in the pn-CCD. Micrometeoroid damage to semiconductor detectors in the focus of grazing incidence optics might be of concern for future space projects with very large collecting area and are proposed to be studied in detail.

Paper Details

Date Published: 11 March 2003
PDF: 12 pages
Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461154
Show Author Affiliations
Norbert Meidinger, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Bernd Aschenbach, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Heinrich W. Braeuninger, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Gerhard Drolshagen, European Space Agency/ESTEC (Netherlands)
Jakob Englhauser, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Robert Hartmann, PNSensor GmbH (Germany)
Gisela D. Hartner, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Ralf Srama, Max-Planck-Institut fuer Kernphysik (Germany)
Lothar Strueder, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Martin Stuebig, Max-Planck-Institut fuer Kernphysik (Germany)
Joachim E. Truemper, Max-Planck-Institut fuer extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 4851:
X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy
Joachim E. Truemper; Harvey D. Tananbaum, Editor(s)

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