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Proceedings Paper

Advanced camera for surveys coronagraph on the Hubble Space Telescope
Author(s): John E. Krist; George F. Hartig; Mark Clampin; David A. Golimowski; Holland C. Ford; Garth D. Illingworth
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Paper Abstract

The Advanced Camera for Surveys (ACS) was installed in the Hubble Space Telescope (HST) during Servicing Mission 3B in early 2002. It includes a High Resolution Camera (0.025 arcsec/pixel) with a selectable coronagraphic mode. Because it was added after construction began on the instrument, this classical Lyot coronagraph must operate on the uncorrected, spherically aberrated beam from HST. The occulting spot is placed at the circle of least confusion, requiring relatively large spot diameters of 1.8 and 3.0 arcseconds. The Lyot stop is placed at the correcting mirror that compensates for spherical aberration. Despite this non-optimal configuration, the diffraction pattern is reduced by a factor of 5-10x, bringing it below the level of light scattered by the mid-spatial-frequency errors in the HST optics. Together with PSF subtraction, the PSF wings can be reduced by over 1000x. The coronagraph will provide high-resolution, high-contrast imaging over a large wavelength range (200-1000 nm).

Paper Details

Date Published: 3 March 2003
PDF: 12 pages
Proc. SPIE 4860, High-Contrast Imaging for Exo-Planet Detection, (3 March 2003);
Show Author Affiliations
John E. Krist, Space Telescope Science Institute (United States)
George F. Hartig, Space Telescope Science Institute (United States)
Mark Clampin, Space Telescope Science Institute (United States)
David A. Golimowski, Johns Hopkins Univ. (United States)
Holland C. Ford, Johns Hopkins Univ. (United States)
Garth D. Illingworth, Univ. of California/Santa Cruz (United States)

Published in SPIE Proceedings Vol. 4860:
High-Contrast Imaging for Exo-Planet Detection
Alfred B. Schultz; Richard G. Lyon, Editor(s)

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