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Proceedings Paper

Preparing Herschel's commissioning phase: Ge:Ga detector tuning
Author(s): Jutta M. Stegmaier; Stephan M. Birkmann; Ulrich Grözinger; Oliver Krause; Dietrich Lemke
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Paper Abstract

The Photodetector Array Camera and Spectrometer (Pacs) instrument aboard the Herschel space observatory contains an integral field spectrometer with two camera channels which consist of 25 linear arrays of 16 stressed Gallium doped Germanium crystals (Ge:Ga) each. The space radiation environment induces changes in the detector performance. Therefore, testing the Ge:Ga detectors under space radiation environment during the commissioning phase (CP) is important for optimization of later detector operation in orbit. The test program for Ge:Ga detector tuning during this phase has been designed according to findings obtained in laboratory experiments: Protons as well as a 137Cs-γ-source have been used to simulate the space radiation environment and to induce the radiation impacts on the photoconductor arrays. From comparison of the performance of the detectors during CP versus laboratory tests the best strategy for operating the detectors during scientific observations will be derived. This includes annealing, proposals for on-board data reduction algorithms and the best estimated strategy for well-calibrated scientific measurements.

Paper Details

Date Published: 12 July 2008
PDF: 12 pages
Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 701009 (12 July 2008); doi: 10.1117/12.788180
Show Author Affiliations
Jutta M. Stegmaier, Max-Planck-Institut für Astronomie (Germany)
Stephan M. Birkmann, Max-Planck-Institut für Astronomie (Germany)
Ulrich Grözinger, Max-Planck-Institut für Astronomie (Germany)
Oliver Krause, Max-Planck-Institut für Astronomie (Germany)
Dietrich Lemke, Max-Planck-Institut für Astronomie (Germany)

Published in SPIE Proceedings Vol. 7010:
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
Jacobus M. Oschmann; Mattheus W. M. de Graauw; Howard A. MacEwen, Editor(s)

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