Mounting MIRI's double prism

Details Mounting MIRI's double prism Mounting MIRI's double prism

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6265e.101f&link_type=abstract

Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter. Edited by Mather, John C.; MacEwen, Howard A.; de Gr

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Scientific paper

MIRI, the Mid-InfraRed Instrument, is one of the 4 instruments currently under development for the NASA/ESA James Webb Space Telescope. Together with the US, MIRI is built by a consortium of 28 European institutes under the lead-management of ESA. The instrument consists of two main modules, a spectroscopic and an imaging part. The imager will allow imaging, coronography and low resolution spectroscopy. The latter mode will use a ZnS-Ge-double-prism assembly as dispersive element. In this contribution, we present the design concept for the mounting of this double prism assembly which places the prisms into the optical path of the imager via an interface to the imager's filterwheel. Despite the very limited available space in the filterwheel and the high weight of the prisms (in comparison to the other filters in the filterwheel), the kinematic mounting of the individual prisms guarantees exact placement with smallest possible induced forces into the prisms. The here presented design of the development model of the double prism assembly is based upon GEM calculation. Experimental thermal and vibrational tests will be performed by the time of this conference.

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