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Proceedings Paper

Cryomechanisms for the instruments MIRI and NIRSpec on the James Webb Space Telescope (JWST)
Author(s): 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
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Paper 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.

Paper Details

Date Published: 10 November 2003
PDF: 13 pages
Proc. SPIE 5152, Infrared Spaceborne Remote Sensing XI, (10 November 2003); doi: 10.1117/12.507420
Show Author Affiliations
Ralph Hofferbert, Max-Planck-Institut fuer Astronomie (Germany)
Dietrich Lemke, Max-Planck-Institut fuer Astronomie (Germany)
Ulrich Groezinger, Max-Planck-Institut fuer Astronomie (Germany)
Thomas F. E. Henning, Max-Planck-Institut fuer Astronomie (Germany)
Stefan Mertin, Max-Planck-Institut fuer Astronomie (Germany)
Ralf-Rainer Rohloff, Max-Planck-Institut fuer Astronomie (Germany)
Karl Wagner, Max-Planck-Institut fuer Astronomie (Germany)
Gillian S. Wright, UK Astronomy Technology Ctr. (United Kingdom)
Huib Visser, TNO-TDP (Netherlands)
Josef Katzer, Carl Zeiss (Germany)
M. Salvasohn, Carl Zeiss (Germany)
Winfried Posselt, EADS Astrium (Germany)
Guy Fargant, Alcatel Space (France)
Ruben Nalbandian, Moog, Inc. (United States)

Published in SPIE Proceedings Vol. 5152:
Infrared Spaceborne Remote Sensing XI
Marija Strojnik, Editor(s)

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