High-order wavefront sensing and control for the Roman Coronagraph Instrument (CGI): architecture and measured performance
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909714114150400 |
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| author | Cady, Eric Bowman, Nicholas Greenbaum, Alexandra Z. Ingalls, James G. Kern, Brian Krist, John Marx, David Poberezhskiy, Ilya Riggs, A J Eldorado Ruane, Garreth Seo, Byoung-Joon Shi, Fang Zhou, Hanying |
| author_facet | Cady, Eric Bowman, Nicholas Greenbaum, Alexandra Z. Ingalls, James G. Kern, Brian Krist, John Marx, David Poberezhskiy, Ilya Riggs, A J Eldorado Ruane, Garreth Seo, Byoung-Joon Shi, Fang Zhou, Hanying |
| contents | The Nancy Grace Roman Space Telescope (``Roman'') is a 2.4m space telescope scheduled for a 2026 launch. The Coronagraph Instrument (CGI) on Roman is a technology-demonstration instrument with a coronagraph and, for the first time in space, deformable mirrors and active wavefront control. This paper walks through the algorithmic and system-level architecture of the HOWFSC implementation for CGI, including the use of ground-in-the-loop (GITL) operations to support computationally-expensive operations, and reports on instrument performance measured during thermal vacuum testing in instrument integration and test. CGI achieved better than $5\times10^{-8}$ total raw contrast with two independent coronagraph architectures covering 3-9 and 6-20 $λ/D$ between them and a $360^{\circ}$ dark hole on each. The contrast limits appear to be driven by time available for testing, and do not appear to represent a floor in the achievable performance of CGI in flight. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_23738 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-order wavefront sensing and control for the Roman Coronagraph Instrument (CGI): architecture and measured performance Cady, Eric Bowman, Nicholas Greenbaum, Alexandra Z. Ingalls, James G. Kern, Brian Krist, John Marx, David Poberezhskiy, Ilya Riggs, A J Eldorado Ruane, Garreth Seo, Byoung-Joon Shi, Fang Zhou, Hanying Instrumentation and Methods for Astrophysics The Nancy Grace Roman Space Telescope (``Roman'') is a 2.4m space telescope scheduled for a 2026 launch. The Coronagraph Instrument (CGI) on Roman is a technology-demonstration instrument with a coronagraph and, for the first time in space, deformable mirrors and active wavefront control. This paper walks through the algorithmic and system-level architecture of the HOWFSC implementation for CGI, including the use of ground-in-the-loop (GITL) operations to support computationally-expensive operations, and reports on instrument performance measured during thermal vacuum testing in instrument integration and test. CGI achieved better than $5\times10^{-8}$ total raw contrast with two independent coronagraph architectures covering 3-9 and 6-20 $λ/D$ between them and a $360^{\circ}$ dark hole on each. The contrast limits appear to be driven by time available for testing, and do not appear to represent a floor in the achievable performance of CGI in flight. |
| title | High-order wavefront sensing and control for the Roman Coronagraph Instrument (CGI): architecture and measured performance |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2507.23738 |