Roman coronagraph HOWFSC modeling: case study and raw contrast performance prediction

Hanying Zhou; Brian Kern; Nathan Bush; John Krist; Ilya Poberezhskiy

doi:10.1117/12.2681773

5 October 2023 Roman coronagraph HOWFSC modeling: case study and raw contrast performance prediction

Hanying Zhou, Brian Kern, Nathan Bush, John Krist, Ilya Poberezhskiy

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 1268027 (2023) https://doi.org/10.1117/12.2681773
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Conference Poster

Abstract

NASA’s Nancy Grace Roman Space Telescope mission includes a Coronagraph Instrument (CGI) to demonstrate active Wavefront Sensing and Control (WFSC) for future direct imaging and characterization of exoplanets. CGI is in the instrument integration and testing phase and is scheduled to be delivered next year for integration into the Roman observatory. Key flight components, such as Deformable Mirrors (DMs) and detectors, have been recently characterized and integrated into the CGI optical system. A series of system level coronagraph requirement verifications in a vacuum chamber will take place starting later this year. Among them is the static raw contrast with a coronagraph stimulus source. This is the only time CGI will have the opportunity for dark hole digging before In-Orbit Commissioning (IOC). CGI High Order Wavefront Sensing and Control (HOWFSC) modeling has played an important role in assisting many engineering decisions and risk assessments and mitigations throughout the project phases, including when calibration data of key components and their imperfections became available. Here we present some of the latest modeling studies involving special use cases or properties of the DMs and detectors and give our current-best-estimates on static raw contrasts for the upcoming performance verification. Contrast performance for IOC phase WFSC with a typical reference star and its brightness is also provided. All evaluations are performed with the full features of HOWFSC modeling and extensive engineering details. This work is performed at the Jet Propulsion Laboratory / California Institute of Technology under contract to NASA.

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Hanying Zhou, Brian Kern, Nathan Bush, John Krist, and Ilya Poberezhskiy "Roman coronagraph HOWFSC modeling: case study and raw contrast performance prediction", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 1268027 (5 October 2023); https://doi.org/10.1117/12.2681773

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