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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 ground 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 designed. This paper describes the details of the light shield mechanism design and test results. Included is information on the labyrinth light path design, motor capability and performance, dry film lubrication, mechanism control, and mechanism cryogenic performance results.
Document ID
20060028229
Acquisition Source
Langley Research 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
May 1, 2006
Publication Information
Publication: 38th Aerospace Mechanisms Symposium
Subject Category
Mechanical Engineering
Distribution Limits
Public
Copyright
Public Use Permitted.

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