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Proceedings Paper

The accuracy of the NIRSpec grating wheel position sensors
Author(s): Guido De Marchi; Stephan M. Birkmann; Torsten Böker; Pierre Ferruit; Giovanna Giardino; Marco Sirianni; Martin Stuhlinger; Maurice B. J. te Plate; Jean-Christophe Salvignol; Reiner Barho; Xavier Gnata; Robert Lemke; Michel Kosse; Peter Mosner
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Paper Abstract

We present a detailed analysis of measurements collected during the first ground-based cryogenic calibration campaign of NIRSpec, the Near-Infrared Spectrograph for the James Webb Space Telescope (JWST). In this paper we concentrate on the performances of the NIRSpec grating wheel, showing that the magneto-resistive position sensors installed on the wheel provide very accurate information on the position of the wheel itself, thereby enabling an efficient acquisition of the science targets and a very accurate extraction and calibration of their spectra.

Paper Details

Date Published: 21 September 2012
PDF: 10 pages
Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84423G (21 September 2012); doi: 10.1117/12.925625
Show Author Affiliations
Guido De Marchi, European Space Research and Technology Ctr. (Netherlands)
Stephan M. Birkmann, European Space Research and Technology Ctr. (Netherlands)
Torsten Böker, European Space Research and Technology Ctr. (Netherlands)
Pierre Ferruit, European Space Research and Technology Ctr. (Netherlands)
Giovanna Giardino, European Space Research and Technology Ctr. (Netherlands)
Marco Sirianni, European Space Research and Technology Ctr. (Netherlands)
Martin Stuhlinger, European Space Astronomy Ctr. (Spain)
Maurice B. J. te Plate, European Space Research and Technology Ctr. (Netherlands)
Jean-Christophe Salvignol, European Space Research and Technology Ctr. (Netherlands)
Reiner Barho, EADS Astrium GmbH (Germany)
Xavier Gnata, EADS Astrium GmbH (Germany)
Robert Lemke, EADS Astrium GmbH (Germany)
Michel Kosse, EADS Astrium GmbH (Germany)
Peter Mosner, EADS Astrium GmbH (Germany)


Published in SPIE Proceedings Vol. 8442:
Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
Mark C. Clampin; Giovanni G. Fazio; Howard A. MacEwen; Jacobus M. Oschmann, Editor(s)

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