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Proceedings Paper

Cryogenic thermal distortion performance characterization for the JWST ISIM structure
Author(s): John Johnston; Emmanuel Cofie; Jason Hylan; Raymond Ohl; Maria Nowak; Douglas McGuffey; James Pontius; Eric Johnson
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Paper Abstract

The James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) Structure is a precision optical metering structure for the JWST science instruments. Optomechanical performance requirements place stringent limits on the allowable thermal distortion of the metering structure between ambient and cryogenic operating temperature (~35 K). This paper focuses on thermal distortion testing and successful verification of performance requirements for the flight ISIM Structure. The ISIM Structure Cryoset Test was completed in Spring 2010 at NASA Goddard Space Flight Center in the Space Environment Simulator Chamber. During the test, the ISIM Structure was thermal cycled twice between ambient and cryogenic (~35 K) temperatures. Photogrammetry was used to measure the Structure in the ambient and cryogenic states for each cycle to assess both cooldown thermal distortion and repeatability. This paper will provide details on the post-processing of the metrology datasets completed to compare measurements with performance requirements.

Paper Details

Date Published: 29 September 2011
PDF: 9 pages
Proc. SPIE 8150, Cryogenic Optical Systems and Instruments XIII, 815009 (29 September 2011); doi: 10.1117/12.893932
Show Author Affiliations
John Johnston, NASA Goddard Space Flight Ctr. (United States)
Emmanuel Cofie, SGT, Inc (United States)
Jason Hylan, NASA Goddard Space Flight Ctr. (United States)
Raymond Ohl, NASA Goddard Space Flight Ctr. (United States)
Maria Nowak, NASA Goddard Space Flight Ctr. (United States)
Douglas McGuffey, NASA Goddard Space Flight Ctr. (United States)
James Pontius, NASA Goddard Space Flight Ctr. (United States)
Eric Johnson, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 8150:
Cryogenic Optical Systems and Instruments XIII
James B. Heaney; E. Todd Kvamme, Editor(s)

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