JWST NIRCam pick-off mirror grounding

Howard Demroff; Paul V. Mammini; Mike S. Jacoby; Brian Jones; Sidney Hu; Ron Dammann; James Mathieson

doi:10.1117/12.2024811

27 September 2013 JWST NIRCam pick-off mirror grounding

Howard Demroff, Paul V. Mammini, Mike S. Jacoby, Brian Jones, Sidney Hu, Ron Dammann, James Mathieson

Proceedings Volume 8863, Cryogenic Optical Systems and Instruments 2013; 88630F (2013) https://doi.org/10.1117/12.2024811
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

The optics train of the Near Infrared Camera (NIRCam) instrument for NASA's James Webb Space Telescope (JWST) includes a pick-off mirror (POM) mounted in the focus and alignment mechanism (FAM). Over the course of the mission, the POM will have a narrow view of the L2 space environment. Charged particles will impinge and collect on the mirror surface increasing the possibility of arcing to the adjacent baffle. A technique to ground the POM and remove accumulated charge has been qualified and implemented on the flight instrument. This paper will provide an overview of the qualification process including cryogenic resistance measurements, vibration testing and optical surface error measurements. To measure the efficiency of this grounding technique, a POM engineering model was exposed to representative mission electron fluence and results with the POM grounded and ungrounded will be presented.

Citation Download Citation

Howard Demroff, Paul V. Mammini, Mike S. Jacoby, Brian Jones, Sidney Hu, Ron Dammann, and James Mathieson "JWST NIRCam pick-off mirror grounding", Proc. SPIE 8863, Cryogenic Optical Systems and Instruments 2013, 88630F (27 September 2013); https://doi.org/10.1117/12.2024811

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