Cryogenic testing of detector alignment of the Fine Guidance Sensor for the James Webb Space Telescope

Sandra Delamer; Sandy Beaton; David Aldridge; Peter Klimas; Gerry Warner; Shenghai Zheng; James Gallagher; Frédéric Grandmont; Neil Rowlands

doi:10.1117/12.860904

3 September 2010 Cryogenic testing of detector alignment of the Fine Guidance Sensor for the James Webb Space Telescope

Sandra Delamer, Sandy Beaton, David Aldridge, Peter Klimas, Gerry Warner, Shenghai Zheng, James Gallagher, Frédéric Grandmont, Neil Rowlands

Author Affiliations +

Proceedings Volume 7793, Optical System Alignment, Tolerancing, and Verification IV; 779308 (2010) https://doi.org/10.1117/12.860904
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

The development of the James Webb Space Telescope (JWST) is an international collaboration led by NASA in partnership with the European Space Agency and the Canadian Space Agency (CSA). The Canadian contribution to the mission is the Fine Guidance Sensor (FGS). The FGS-Guider images two fields of view onto two detectors. For testing, Optical Ground Support Equipment telescopes are used to simulate the image from the Observatory's Optical Telescope Element. The FGS Engineering Test Unit (ETU) comprises 2 functioning Guider channels: one fully functional channel with a Teledyne H2RG HgCdTe 5 micron cutoff detector, and another with an H2RG multiplexer in place of a detector. This paper reports on the results of cryogenic vacuum testing of the alignment of the final ETU instrument configuration. Images at ambient (from the H2RG multiplexer) and at cryo (from detector and H2RG multiplexer) were analysed to determine best focus and FGS field of view at cryogenic temperatures. The ETU test results for best focus, tip/tilt of focal planes, field of view location and size are well matched to the budgets and predictions and meet requirements for the FGS-Guider.

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Sandra Delamer, Sandy Beaton, David Aldridge, Peter Klimas, Gerry Warner, Shenghai Zheng, James Gallagher, Frédéric Grandmont, and Neil Rowlands "Cryogenic testing of detector alignment of the Fine Guidance Sensor for the James Webb Space Telescope", Proc. SPIE 7793, Optical System Alignment, Tolerancing, and Verification IV, 779308 (3 September 2010); https://doi.org/10.1117/12.860904

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