29 September 2004 Positioning of optical elements in the cryogenically cooled mid-infrared instrument MIRI for the James Webb Space Telescope
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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.
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Dietrich Lemke, Dietrich Lemke, Ralph Hofferbert, Ralph Hofferbert, Ulrich Grozinger, Ulrich Grozinger, Ralf-Rainer Rohloff, Ralf-Rainer Rohloff, Armin Bohm, Armin Bohm, Thomas Henning, Thomas Henning, Armin Huber, Armin Huber, Stefan Mertin, Stefan Mertin, Jose Ramos, Jose Ramos, Gillian Wright, Gillian Wright, Peter Hastings, Peter Hastings, Alex Zehnder, Alex Zehnder, Sophie Salasca, Sophie Salasca, Gabby Kroes, Gabby Kroes, Christian Straubmeier, Christian Straubmeier, Andreas Eckart, Andreas Eckart, "Positioning of optical elements in the cryogenically cooled mid-infrared instrument MIRI for the James Webb Space Telescope", Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); doi: 10.1117/12.550398; https://doi.org/10.1117/12.550398
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