22 July 2016 WFIRST/AFTA coronagraph contrast performance sensitivity studies: simulation versus experiment
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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.
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Erkin Sidick, Byoung-Joon Seo, David Marx, Ilya Poberezhskiy, Bijan Nemati, "WFIRST/AFTA coronagraph contrast performance sensitivity studies: simulation versus experiment", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99126M (22 July 2016); doi: 10.1117/12.2231763; http://dx.doi.org/10.1117/12.2231763
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KEYWORDS
Actuators

Coronagraphy

Device simulation

Optical components

Telescopes

Wavefronts

Calibration

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