Cryogenic thermal distortion model validation 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. A significant effort was completed to develop capabilities
to predict and metrologize cryogenic thermal distortion of the ISIM Structure. This paper focuses on thermal distortion
finite element modeling, analysis, and model validation. Extensive thermal distortion analysis was completed during the
design phase for the ISIM Structure to demonstrate that thermal distortion requirements were achieved. Comparison of
measurements from recently completed cryogenic testing and model predictions demonstrate the adequacy of thermal
distortion modeling uncertainty factors adopted during the design phase, and provide bounds on the accuracy of the
model predictions. This paper will provide an overview of the test configurations, describe the thermal distortion models
of the tests, and provide a comparison of test results and analytical predictions from the models.
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