Cryogenic Thermal Distortion Performance Characterization for the JWST ISIM Structure
2011
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.
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