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Proceedings Paper

The grating and filter wheels for the JWST NIRSpec instrument
Author(s): K. Weidlich; M. Sedlacek; M. Fischer; M. Trunz; M. Ellenrieder; D. Lemke; O. Krause; R. Hofferbert; U. Grözinger; G. Königsreiter; C. Neugebauer
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Paper Abstract

The Near-Infrared Spectrograph (NIRSpec) onboard the James Webb Space Telescope can be reconfigured in space for astronomical observation in a range of filter bands as well as spectral resolutions. This will be achieved using a Filter wheel (FWA) which carries 7 transmission filters and a Grating wheel (GWA) which carries six gratings and one prism. The large temperature shift between warm launch and cryogenic operation (30K) and high launch vibration loads on the one hand side and accurate positioning capability and minimum deformation of optical components on the other hand side must be consolidated into a single mechanical design which will be achieved using space-proven concepts derived from the successful ISO filter wheel mechanisms which were manufactured and tested by Carl Zeiss. Carl Zeiss Optronics has been selected by Astrium GmbH for the implementation of both NIRSpec wheel mechanisms. Austrian Aerospace and Max-Planck-Institut fur Astronomie Heidelberg (MPIA) will contribute major work shares to the project. The project was started in October 2005 and the preliminary designs have been finalized recently. Critical performance parameters are properly allocated to respective hardware components, procurements of long-lead items have been initiated and breadboard tests have started. This paper presents an overview of the mechanism designs, discusses its properties and the approach for component level tests.

Paper Details

Date Published: 6 July 2006
PDF: 8 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 627323 (6 July 2006); doi: 10.1117/12.670692
Show Author Affiliations
K. Weidlich, Carl Zeiss Optronics GmbH (Germany)
M. Sedlacek, Carl Zeiss Optronics GmbH (Germany)
M. Fischer, Carl Zeiss Optronics GmbH (Germany)
M. Trunz, Carl Zeiss Optronics GmbH (Germany)
M. Ellenrieder, Carl Zeiss Optronics GmbH (Germany)
D. Lemke, Max-Planck-Institut für Astronomie (Germany)
O. Krause, Max-Planck-Institut für Astronomie (Germany)
R. Hofferbert, Max-Planck-Institut für Astronomie (Germany)
U. Grözinger, Max-Planck-Institut für Astronomie (Germany)
G. Königsreiter, Austrian Aerospace GmbH (Austria)
C. Neugebauer, Austrian Aerospace GmbH (Austria)

Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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