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Proceedings Paper

WFIRST/AFTA coronagraph contrast performance sensitivity studies: simulation versus experiment
Author(s): Erkin Sidick; Byoung-Joon Seo; David Marx; Ilya Poberezhskiy; Bijan Nemati
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Paper Abstract

The WFIRST/AFTA 2.4 m space telescope currently under study includes a stellar coronagraph for the imaging and the spectral characterization of extrasolar planets. The coronagraph employs sequential deformable mirrors to compensate for phase and amplitude errors. Using the optical model of an Occulting Mask Coronagraph (OMC) testbed at the Jet Propulsion Laboratory, we have investigated through modeling and simulations the sensitivity of dark hole contrast in a Hybrid Lyot Coronagraph (HLC) for several error cases, including lateral and longitudinal translation errors of two deformable mirrors, DM1 and DM2, lateral and/or longitudinal translation errors of an occulting mask and a Lyot-Stop, clocking errors of DM1 and DM2, and the mismatch errors between the testbed and the model sensitivity matrices. We also investigated the effects of a control parameter, namely the actuator regularization factor, on the control efficiency and on the final contrast floor. We found several error cases which yield contrast results comparable to that observed on the HLC testbed. We present our findings in this paper.

Paper Details

Date Published: 22 July 2016
PDF: 12 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99126M (22 July 2016); doi: 10.1117/12.2231763
Show Author Affiliations
Erkin Sidick, Jet Propulsion Lab. (United States)
Byoung-Joon Seo, Jet Propulsion Lab. (United States)
David Marx, Jet Propulsion Lab. (United States)
Ilya Poberezhskiy, Jet Propulsion Lab. (United States)
Bijan Nemati, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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