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Proceedings Paper

Small-grid dithers for the JWST coronagraphs
Author(s): Charles-Philippe Lajoie; Rémi Soummer; Laurent Pueyo; Dean C. Hines; Edmund P. Nelan; Marshall Perrin; Mark Clampin; John C. Isaacs
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Paper Abstract

We discuss new results of coronagraphic simulations demonstrating a novel mode for JWST that utilizes sub-pixel dithered reference images, called Small-Grid Dithers, to optimize coronagraphic PSF subtraction. These sub-pixel dithers are executed with the Fine Steering Mirror under fine guidance, are accurate to ~2-3 milliarcseconds (1-σ/axis), and provide ample speckle diversity to reconstruct an optimized synthetic reference PSF using LOCI or KLIP. We also discuss the performance gains of Small-Grid Dithers compared to the standard undithered scenario, and show potential contrast gain factors for the NIRCam and MIRI coronagraphs ranging from 2 to more than 10, respectively.

Paper Details

Date Published: 29 July 2016
PDF: 8 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99045K (29 July 2016); doi: 10.1117/12.2233032
Show Author Affiliations
Charles-Philippe Lajoie, Space Telescope Science Institute (United States)
Rémi Soummer, Space Telescope Science Institute (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Dean C. Hines, Space Telescope Science Institute (United States)
Edmund P. Nelan, Space Telescope Science Institute (United States)
Marshall Perrin, Space Telescope Science Institute (United States)
Mark Clampin, NASA Goddard Space Flight Ctr. (United States)
John C. Isaacs, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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