10 November 2003 Cryomechanisms for the instruments MIRI and NIRSpec on the James Webb Space Telescope (JWST)
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Abstract
The Mid-Infrared Instrument (MIRI) and the Near-Infrared Spectrograph (NIRSpec) of the JWST require various mechanisms for positioning optical elements in cryo-vacuum environment (7K resp. 35K): Wheels for exchanging filters, gratings and prisms, a flip mirror for switching between the sky and internal calibration sources and a linear actuator for refocusing purposes will have to be developed. In order to fulfill the stringent requirements of the mission, comprising to survive a warm ARIANE 5 launch, to guarantee high accuracy positioning in the cryovacuum with minimal power dissipation, to be operational with high reliability during 10 years of lifetime and to be testable under various environmental conditions, we propose a low cost and low schedule risk approach, based on the successful flight experience and qualification heritage from ESA’s infrared missions ISO and HERSCHEL.
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Ralph Hofferbert, Dietrich Lemke, Ulrich Groezinger, Thomas F. E. Henning, Stefan Mertin, Ralf-Rainer Rohloff, Karl Wagner, Gillian S. Wright, Huib Visser, Josef Katzer, M. Salvasohn, Winfried Posselt, Guy Fargant, Ruben Nalbandian, "Cryomechanisms for the instruments MIRI and NIRSpec on the James Webb Space Telescope (JWST)", Proc. SPIE 5152, Infrared Spaceborne Remote Sensing XI, (10 November 2003); doi: 10.1117/12.507420; https://doi.org/10.1117/12.507420
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