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Optical Coating Performance and Thermal Structure Design for Heat Reflectors of JWST Electronic Control UnitThe 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 system.
Document ID
20080030272
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Quijada, Manuel A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Threat, Felix
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Garrison, Matt
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Perrygo, Chuck
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bousquet, Robert
(Genesis Engineering Solutions, Inc. Lanham, MD, United States)
Rashford, Robert
(Genesis Engineering Solutions, Inc. Lanham, MD, United States)
Date Acquired
August 24, 2013
Publication Date
June 23, 2008
Subject Category
Mechanical Engineering
Meeting Information
Meeting: SPIE Astronomical Instrumentation 2008 Conference
Location: Karseilles
Country: France
Start Date: June 23, 2008
End Date: June 28, 2008
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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