High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument

Kai Weidlich; Manfred Fischer; Marc M. Ellenrieder; Torsten Gross; Jean-Christophe Salvignol; Reiner Barho; Christian Neugebauer; Günter Königsreiter; Michael Trunz; Friedrich Müller; Oliver Krause

doi:10.1117/12.789663

23 July 2008 High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument

Kai Weidlich, Manfred Fischer, Marc M. Ellenrieder, Torsten Gross, Jean-Christophe Salvignol, Reiner Barho, Christian Neugebauer, Günter Königsreiter, Michael Trunz, Friedrich Müller, Oliver Krause

Author Affiliations +

Proceedings Volume 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation; 701821 (2008) https://doi.org/10.1117/12.789663
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

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Kai Weidlich, Manfred Fischer, Marc M. Ellenrieder, Torsten Gross, Jean-Christophe Salvignol, Reiner Barho, Christian Neugebauer, Günter Königsreiter, Michael Trunz, Friedrich Müller, and Oliver Krause "High-precision cryogenic wheel mechanisms for the JWST NIRSpec instrument", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701821 (23 July 2008); https://doi.org/10.1117/12.789663

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