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Proceedings Paper

Optical coating performance for heat reflectors of JWST-ISIM electronic component
Author(s): Manuel A. Quijada; Robert Bousquet; Matt Garrison; Chuck Perrygo; Felix Threat; Robert Rashford
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Paper Abstract

The James Webb Space Telescope (JWST) consists of an infrared-optimized Optical Telescope Element (OTE) that is cooled down to 40 degrees Kelvin. A second adjacent component to the OTE is the Integrated Science Instrument Module, or ISIM. This module includes the electronic compartment, which provides the mounting surfaces and ambient thermally controlled environment for the instrument control electronics. Dissipating the 200 watts generated from the ISIM structure away from the OTE is of paramount importance so that the spacecraft's own heat does not interfere with the infrared light detected from distant cosmic sources. This technical challenge is overcome by a thermal subsystem unit that provides passive cooling to the ISIM control electronics. The proposed design of this thermal radiator consists of a lightweight structure made out of composite materials and low-emittance metal coatings. In this paper, we will present characterizations of the coating emittance, bidirectional reflectance, and mechanical structure design that will affect the performance of this passive cooling reflector.

Paper Details

Date Published: 12 July 2008
PDF: 11 pages
Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 70103G (12 July 2008); doi: 10.1117/12.790521
Show Author Affiliations
Manuel A. Quijada, NASA Goddard Space Flight Ctr. (United States)
Robert Bousquet, Genesis Engineering Solutions, Inc. (United States)
Matt Garrison, NASA Goddard Space Flight Ctr. (United States)
Chuck Perrygo, NASA Goddard Space Flight Ctr. (United States)
Felix Threat, NASA Goddard Space Flight Ctr. (United States)
Robert Rashford, Genesis Engineering Solutions, Inc. (United States)


Published in SPIE Proceedings Vol. 7010:
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
Jacobus M. Oschmann; Mattheus W. M. de Graauw; Howard A. MacEwen, Editor(s)

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