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Proceedings Paper

Positioning of optical elements in the cryogenically cooled mid-infrared instrument MIRI for the James Webb Space Telescope
Author(s): Dietrich Lemke; Ralph Hofferbert; Ulrich Grozinger; Ralf-Rainer Rohloff; Armin Bohm; Thomas Henning; Armin Huber; Stefan Mertin; Jose Ramos; Gillian Wright; Peter Hastings; Alex Zehnder; Sophie Salasca; Gabby Kroes; Christian Straubmeier; Andreas Eckart
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Paper Abstract

MIRI is one of three focal plane instruments for the JWST covering the wavelengths region 5...28 μm. It is jointly developed by US and European institutes with the latter ones being responsible for the complete optical bench assembly, cryomechanisms, calibration source and the related electronics. MIRI is the combination of an imager with coronographic and low-resolution spectroscopic capabilities and a high-resolution integral-field spectrometer. These diverse options require several mechanisms to select a specific observing mode: (1) a filter wheel with bandpass filters, coronographic masks and a prism, (2) two grating/dichroic wheels with dispersing and order-sorting elements and (3) a flip mirror to direct the beam of an internal black body source into the spectrometer section. All mechanisms are required to operate under laboratory conditions (warm launch) as well as in the cryovacuum in space. The heat dissipation has to be small and the reliability and precision very high. Our low risk approach is the application of successfully qualified and flown components of the ISOPHOT (ISO) and PACS (HERSCHEL) instruments. We will report on the concept developed in phase B.

Paper Details

Date Published: 29 September 2004
PDF: 8 pages
Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); doi: 10.1117/12.550398
Show Author Affiliations
Dietrich Lemke, Max-Planck-Institut fur Astronomie (Germany)
Ralph Hofferbert, Max-Planck-Institut fur Astronomie (Germany)
Ulrich Grozinger, Max-Planck-Institut fur Astronomie (Germany)
Ralf-Rainer Rohloff, Max-Planck-Institut fur Astronomie (Germany)
Armin Bohm, Max-Planck-Institut fur Astronomie (Germany)
Thomas Henning, Max-Planck-Institut fur Astronomie (Germany)
Armin Huber, Max-Planck-Institut fur Astronomie (Germany)
Stefan Mertin, Max-Planck-Institut fur Astronomie (Germany)
Jose Ramos, Max-Planck-Institut fur Astronomie (Germany)
Gillian Wright, UK Astronomy Technology Ctr. (United Kingdom)
Peter Hastings, UK Astronomy Technology Ctr. (United Kingdom)
Alex Zehnder, Paul-Scherrer-Institut (Switzerland)
Sophie Salasca, CEA, Service d'Astrophysique (France)
Gabby Kroes, ASTRON (Netherlands)
Christian Straubmeier, Univ. zu Koln (Germany)
Andreas Eckart, Univ. zu Koln (Germany)

Published in SPIE Proceedings Vol. 5495:
Astronomical Structures and Mechanisms Technology
Joseph Antebi; Dietrich Lemke, Editor(s)

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