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Proceedings Paper

High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument
Author(s): Kai Weidlich; Manfred Fischer; Marc M. Ellenrieder; Torsten Gross; Jean-Christophe Salvignol; Reiner Barho; Christian Neugebauer; Günter Königsreiter; Michael Trunz; Friedrich Müller; Oliver Krause
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Paper Abstract

The Grating and Filter Wheel Mechanisms of the JWST NIRSpec instrument allow for reconfiguration of the spectrograph in space in a number of NIR sub-bands and spectral resolutions. Challenging requirements need to be met simultaneously including high launch loads, the large temperature shift to cryo-space, high position repeatability and minimum deformation of the mounted optics. The design concept of the NIRSpec wheel mechanisms is based on the ISOPHOT Filter Wheels but with significant enhancements to support much larger optics. A well-balanced set of design parameters was to be found and a considerable effort was spent to adjust the hardware within narrow tolerances.

Paper Details

Date Published: 23 July 2008
PDF: 12 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701821 (23 July 2008); doi: 10.1117/12.789663
Show Author Affiliations
Kai Weidlich, Carl Zeiss Optronics GmbH (Germany)
Manfred Fischer, Carl Zeiss Optronics GmbH (Germany)
Marc M. Ellenrieder, Carl Zeiss Optronics GmbH (Germany)
Torsten Gross, Carl Zeiss Optronics GmbH (Germany)
Jean-Christophe Salvignol, European Space Agency (Netherlands)
Reiner Barho, EADS Astrium GmbH (Germany)
Christian Neugebauer, Austrian Aerospace GmbH (Austria)
Günter Königsreiter, Austrian Aerospace GmbH (Austria)
Michael Trunz, Ing.-Büro für Strukturmechanik Trunz (Germany)
Friedrich Müller, Max-Planck-Institut für Astronomie (Germany)
Oliver Krause, Max-Planck-Institut für Astronomie (Germany)

Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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