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JWST NIRSpec Cryogenic Light Shield MechanismThe focal plane detectors for the Near-Infrared Spectrometer (NIRSpec) instrument on the James Webb Space Telescope (JWST) require a light tight cover for calibration along with an open field-of-view during g round performance testing within a cryogenic dewar. In order to meet the light attenuation requirements and provide open and closed fields of view without breaking vacuum, a light shield mechanism was designe d. This paper describes the details of the light shield mechanism design and test results. Included is information on the labyrinth light p ath design, motor capability and performance, dry film lubrication, m echanism control, and mechanism cryogenic performance results.
Document ID
20060020064
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Hale, Kathleen (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sharma, Rajeev (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Space Sciences (General)
Meeting Information
Meeting: 38th Aerospace Mechanisms Symposium
Location: Hampton, VA
Country: United States
Start Date: May 17, 2006
End Date: May 19, 2006
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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