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Proceedings Article

High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument

[+] Author Affiliations
Kai Weidlich, Manfred Fischer, Marc M. Ellenrieder, Torsten Gross

Carl Zeiss Optronics GmbH (Germany)

Jean-Christophe Salvignol

European Space Agency (Netherlands)

Reiner Barho

EADS Astrium GmbH (Germany)

Christian Neugebauer, Günter Königsreiter

Austrian Aerospace GmbH (Austria)

Michael Trunz

Ing.-Büro für Strukturmechanik Trunz (Germany)

Friedrich Müller, Oliver Krause

Max-Planck-Institut für Astronomie (Germany)

Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701821 (July 14, 2008); doi:10.1117/12.789663
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From Conference Volume 7018

  • Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
  • Eli Atad-Ettedgui; Dietrich Lemke
  • Marseille, France | June 23, 2008

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.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Kai Weidlich ; Manfred Fischer ; Marc M. Ellenrieder ; Torsten Gross ; Jean-Christophe Salvignol, et al.
"High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701821 (July 14, 2008); doi:10.1117/12.789663; http://dx.doi.org/10.1117/12.789663


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