2 August 2010 Cryogenic wavefront error measurement for the James Webb Space Telescope fine guidance sensor powered optics
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Abstract
The Fine Guidance Sensor (FGS) is part of the instrument module for the James Webb Space Telescope (JWST). The FGS operates at 37 K and provides feedback to correct motion blur caused by relative motion within the observatory - an issue during long exposures. It also provides a tunable camera for science observations. The FGS powered optics comprises three, Three Mirror Assembly (TMA) - style reflective systems - one with finite conjugates and the remaining two are an infinite/finite conjugate pair. This paper addresses the issues of providing traceable interferometric wave-front error measurements when the test optics are in a cryogenic vacuum chamber. To meet space and time limits, we restrict attention to the finite conjugate device for the purposes of this publication.
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Clinton E. Evans, Clinton E. Evans, Elliot S. Greenberg, Elliot S. Greenberg, David A. Aldridge, David A. Aldridge, Jeffrey J. Santman, Jeffrey J. Santman, "Cryogenic wavefront error measurement for the James Webb Space Telescope fine guidance sensor powered optics", Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 779004 (2 August 2010); doi: 10.1117/12.860856; https://doi.org/10.1117/12.860856
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