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Proceedings Paper

Calibrating the position of images and spectra in the NIRSpec instrument for the James Webb Space Telescope
Author(s): Guido De Marchi; Maurice B. J. te Plate; Stephan M. Birkmann; Torsten Böker; Pierre Ferruit; Giovanna Giardino; Peter Jakobsen; Marco Sirianni; Jean-Christophe Savignol; Xavier Gnata; Reiner Barho; Michel Kosse; Peter Mosner; Bernhard Dorner; Giovanni Cresci; Fabian Rosales-Ortega; Martin Stuhlinger; Torsten Gross; Thomas Leikert
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Paper Abstract

The Near Infrared Spectrograph (NIRSpec) is one of four science instruments on board the James Webb Space Telescope (JWST). NIRSpec offers multi-object, fixed slit, and integral field spectroscopy. There are eight optical elements mounted on the grating wheel assembly (GWA), six gratings, a double-pass prism, and a mirror. The precise knowledge of the position and tilt of these elements is critical for target acquisition and an accurate extraction and calibration of science data. We present the concept of calibrating the position/tilt sensors during the NIRSpec flight model ground calibration campaign, the performance of the sensors and first results concerning the GWA repeatability.

Paper Details

Date Published: 28 September 2011
PDF: 8 pages
Proc. SPIE 8150, Cryogenic Optical Systems and Instruments XIII, 81500C (28 September 2011); doi: 10.1117/12.893914
Show Author Affiliations
Guido De Marchi, European Space Agency, ESTEC (Netherlands)
Maurice B. J. te Plate, European Space Agency, ESTEC (Netherlands)
Stephan M. Birkmann, European Space Agency, ESTEC (Netherlands)
Torsten Böker, European Space Agency, ESTEC (Netherlands)
Pierre Ferruit, European Space Agency, ESTEC (Netherlands)
Giovanna Giardino, European Space Agency, ESTEC (Netherlands)
Peter Jakobsen, European Space Agency, ESTEC (Netherlands)
Marco Sirianni, European Space Agency, ESTEC (Netherlands)
Jean-Christophe Savignol, European Space Agency, ESTEC (Netherlands)
Xavier Gnata, EADS Astrium GmbH (Germany)
Reiner Barho, EADS Astrium GmbH (Germany)
Michel Kosse, EADS Astrium GmbH (Germany)
Peter Mosner, EADS Astrium GmbH (Germany)
Bernhard Dorner, Observatoire de Lyon, Univ. de Lyon (France)
Ctr. de Recherche Astrophysique de Lyon, CNRS (France)
Giovanni Cresci, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Fabian Rosales-Ortega, CSIC - INTA (Spain)
Martin Stuhlinger, European Space Astronomy Ctr. (Spain)
Torsten Gross, Carl Zeiss Optronics GmbH (Germany)
Thomas Leikert, Carl Zeiss Optronics GmbH (Germany)


Published in SPIE Proceedings Vol. 8150:
Cryogenic Optical Systems and Instruments XIII
James B. Heaney; E. Todd Kvamme, Editor(s)

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