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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 421603.0, MPI für Astronomie / Publikationen_mpia
Cryogenic wheel mechanisms for the Mid-Infrared Instrument (MIRI) of the James Webb Space Telescope (JWST): detailed design and test results from the qualification program
Authors:Krause, O.; Birkmann, S.; Blümchen, T.; Böhm, A.; Ebert, M.; Grözinger, U.; Henning, Th; Hofferbert, R.; Huber, A.; Lemke, D.; Rohloff, R. R.; Scheithauer, S.; Gross, T.; Luichtel, G.; Stein, C.; Stott, R.; Übele, M.; Amiaux, J.; Auguères, J. L.; Glauser, A.; Zehnder, A.; Meijers, M.; Jager, R.; Parr-Burrman, P.; Wright, G.
Place of Publication:Bellingham, Wash.
Date of Publication (YYYY-MM-DD):2008
Title of Proceedings:Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Start Page:701824-701824
End Page:10
Title of Series:SPIE
Volume (in Series):7018
Name of Conference/Meeting:Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Place of Conference/Meeting:Marseille
Review Status:not specified
Audience:Experts Only
Abstract / Description:The Mid-Infrared Instrument (MIRI) of the James Webb Space Telescope, scheduled for launch in 2013, will provide a variety of observing modes such as broad/narrow-band imaging, coronagraphy and low/medium resolution spectroscopy. One filter wheel and two dichroic-grating wheel mechanisms allow to configure the instrument between the different observing modes and wavelength ranges. The main requirements for the three mechanisms with up to 18 positions on the wheel include: (1) reliable operation at T ~ 7 K, (2) optical precision, (3) low power dissipation, (4) high vibration capability, (5) functionality at 6 K < T < 300 K and (6) long lifetime (5-10 years). To meet these stringent requirement, a space-proven mechanism design based on the European ISO mission and consisting of a central bearing carrying the optical wheels, a central torque motor for wheel actuation, a ratchet system for precise and powerless positioning and a magnetoresistive position sensor has been selected. We present here the detailed design of the flight models and report results from the extensive component qualification.
Comment of the Author/Creator:Date: 2008, July 1, 2008
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL: [ID No:1]
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