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WFIRST/AFTA coronograph contrast performance sensitivity studies: simulation versus experiment

Show simple item record Sidick, Erkin Seo, Byoung-Joon Marx, David Poberezhskiy, Ilya Nemati, Bijan 2019-03-29T17:37:29Z 2019-03-29T17:37:29Z 2016-06-26
dc.identifier.citation SPIE Astronomical Telescopes + Instrumentation 2016, Edinburgh, Scotland, June 26 - July 1, 2016 en_US
dc.identifier.clearanceno 16-2984
dc.description.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. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2016 en_US
dc.subject Coronagraphy en_US
dc.subject adaptive optics en_US
dc.subject deformable mirrors en_US
dc.subject space telescopes en_US
dc.subject exoplanets en_US
dc.title WFIRST/AFTA coronograph contrast performance sensitivity studies: simulation versus experiment en_US
dc.type Presentation en_US

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