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Proceedings Paper

James Webb Space Telescope optical simulation testbed V: wide-field phase retrieval assessment
Author(s): Iva Laginja; Greg Brady; Rémi Soummer; Sylvain Egron; Christopher Moriarty; Charles-Philippe Lajoie; Aurélie Bonnefois; Vincent Michau; Élodie Choquet; Marc Ferrari; Lucie Leboulleux; Olivier Levecq; Mamadou N'Diaye; Marshall D. Perrin; Peter Petrone; Laurent Pueyo; Anand Sivaramakrishnan
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Paper Abstract

The James Webb Space Telescope (JWST) Optical Simulation Testbed (JOST) is a hardware simulator for wavefront sensing and control designed to produce JWST-like images. A model of the JWST three mirror anastigmat is realized with three lenses in the form of a Cooke triplet, which provides JWST-like optical quality over a field equivalent to a NIRCam module. An Iris AO hexagonally segmented mirror stands in for the JWST primary. This setup successfully produces images extremely similar to expected JWST in- ight point spread functions (PSFs), and NIRCam images from cryotesting, in terms of the PSF morphology and sampling relative to the diffraction limit. The segmentation of the primary mirror into subapertures introduces complexity into wavefront sensing and control (WFSandC) of large space based telescopes like JWST. JOST provides a platform for independent analysis of WFSandC scenarios for both commissioning and maintenance activities on such observatories. We present an update of the current status of the testbed including both single field and wide-field alignment results. We assess the optical quality of JOST over a wide field of view to inform the future implementation of different wavefront sensing algorithms including the currently implemented Linearized Algorithm for Phase Diversity (LAPD). JOST complements other work at the Makidon Laboratory at the Space Telescope Science Institute, including the High-contrast imager for Complex Aperture Telescopes (HiCAT) testbed, that investigates coronagraphy for segmented aperture telescopes. Beyond JWST we intend to use JOST for WFSandC studies for future large segmented space telescopes such as LUVOIR.

Paper Details

Date Published: 21 August 2018
PDF: 13 pages
Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106983N (21 August 2018); doi: 10.1117/12.2313892
Show Author Affiliations
Iva Laginja, Space Telescope Science Institute (United States)
Greg Brady, Space Telescope Science Institute (United States)
Rémi Soummer, Space Telescope Science Institute (United States)
Sylvain Egron, Iridescence S.A.R.L. (France)
Christopher Moriarty, Space Telescope Science Institute (United States)
Charles-Philippe Lajoie, Space Telescope Science Institute (United States)
Aurélie Bonnefois, Office National d'Études et de Recherches Aérospatiales (France)
Vincent Michau, Office National d'Études et de Recherches Aérospatiales (France)
Élodie Choquet, California Institute of Technology (United States)
Jet Propulsion Lab. (United States)
Marc Ferrari, Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
Lucie Leboulleux, Space Telescope Science Institute (United States)
Office National d'Études et de Recherches Aérospatiales (France)
Aix-Marseille Univ., CNRS, Lab. d'Astrophysique de Marseille (France)
Olivier Levecq, DAMAE Medical (France)
Mamadou N'Diaye, Observatoire de la Côte d'Azur (France)
Marshall D. Perrin, Space Telescope Science Institute (United States)
Peter Petrone, Space Telescope Science Institute (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Anand Sivaramakrishnan, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 10698:
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Makenzie Lystrup; Howard A. MacEwen; Giovanni G. Fazio; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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