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Proceedings Paper

FIRST-PACS: design and performance of the sensor engineering models
Author(s): Stefan Kraft; Otto Frenzl; Olivier Charlier; Thys Cronje; Reinhard O. Katterloher; Dirk Rosenthal; Ulrich Groezinger; Jeffrey W. Beeman
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Paper Abstract

The Photoconductor Array Camera and Spectrometer (PACS) will be equipped with two sensor arrays consisting of 16 X 25 pixels each. Arranged in linear arrays of 16 detectors the sensitivity of the sensors is tuned to the wavelength ranges 60 micrometers to 130 micrometers and 130 micrometers to 210 micrometers , by applying different levels of stress to the Ge:Ga crystal utilizing a special leaf spring which is part of each of the 25 modules. The electronics of the sensors are mounted on the same module but thermally isolated from the sensor level which is at a lower temperature of about 2 K. The sensors are read out by a specially developed integrating and multiplexing cryogenic read-out electronics. With a fore optics made of light cones in front of the detector cavities a 100% filling factor is achieved and a high quantum efficiency close to 0.5 is expected. In order to achieve extremely good stress uniformity in all detectors and therefore equal cutoff wavelengths, a high degree of the quality of the Ge:Ga detectors and of the assembling components used for this dedicated stress mechanism is required. The first 6 engineering modules have been successfully manufactured and tested afterwards. The relative responsivity of a set of pixels has been determined and a good performance has been demonstrated for the sensors, which are very close to fulfilling the requirements for PACS aboard the infrared spectra telescope FIRST.

Paper Details

Date Published: 28 July 2000
PDF: 11 pages
Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (28 July 2000); doi: 10.1117/12.393979
Show Author Affiliations
Stefan Kraft, ANTEC GmbH (Netherlands)
Otto Frenzl, ANTEC GmbH (Germany)
Olivier Charlier, IMEC (Belgium)
Thys Cronje, IMEC (Belgium)
Reinhard O. Katterloher, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Dirk Rosenthal, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Ulrich Groezinger, Max-Planck-Institut fuer Astronomie (Germany)
Jeffrey W. Beeman, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 4013:
UV, Optical, and IR Space Telescopes and Instruments
James B. Breckinridge; Peter Jakobsen, Editor(s)

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