2 August 2014 James Webb Space Telescope Optical Simulation Testbed I: overview and first results
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Abstract
The James Webb Space Telescope (JWST) Optical Simulation Testbed (JOST) is a tabletop workbench to study aspects of wavefront sensing and control for a segmented space telescope, including both commissioning and maintenance activities. JOST is complementary to existing optomechanical testbeds for JWST (e.g. the Ball Aerospace Testbed Telescope, TBT) given its compact scale and flexibility, ease of use, and colocation at the JWST Science & Operations Center. We have developed an optical design that reproduces the physics of JWST's three-mirror anastigmat using three aspheric lenses; it provides similar image quality as JWST (80% Strehl ratio) over a field equivalent to a NIRCam module, but at HeNe wavelength. A segmented deformable mirror stands in for the segmented primary mirror and allows control of the 18 segments in piston, tip, and tilt, while the secondary can be controlled in tip, tilt and x, y, z position. This will be sufficient to model many commissioning activities, to investigate field dependence and multiple field point sensing & control, to evaluate alternate sensing algorithms, and develop contingency plans. Testbed data will also be usable for cross-checking of the WFS&C Software Subsystem, and for staff training and development during JWST's five- to ten-year mission.
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Marshall D. Perrin, Marshall D. Perrin, Rémi Soummer, Rémi Soummer, Élodie Choquet, Élodie Choquet, Mamadou N'Diaye, Mamadou N'Diaye, Olivier Levecq, Olivier Levecq, Charles-Philippe Lajoie, Charles-Philippe Lajoie, Marie Ygouf, Marie Ygouf, Lucie Leboulleux, Lucie Leboulleux, Sylvain Egron, Sylvain Egron, Rachel Anderson, Rachel Anderson, Chris Long, Chris Long, Erin Elliott, Erin Elliott, George Hartig, George Hartig, Laurent Pueyo, Laurent Pueyo, Roeland van der Marel, Roeland van der Marel, Matt Mountain, Matt Mountain, "James Webb Space Telescope Optical Simulation Testbed I: overview and first results", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 914309 (2 August 2014); doi: 10.1117/12.2056936; https://doi.org/10.1117/12.2056936
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