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Proceedings Paper

The LSST camera corner raft conceptual design: a front-end for guiding and wavefront sensing
Author(s): Kirk Arndt; Vincent Riot; Enver Alagoz; Alec Biccum; Andy Bohn; Joseph Clampit; Tony Coiro; Wei Cui; Liz Hoffman; Alan Lichti; Desiree Skaggs; Ian Shipsey; Matt Triano; Bo Xin; Kat Ziegler; John Oliver; Richard Van Berg; Gunther Haller; Leonid Sapozhnikov; Scot Olivier
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Paper Abstract

The Large Synoptic Survey Telescope (LSST) is a proposed ground based telescope that will perform a comprehensive astronomical survey by imaging the entire visible sky in a continuous series of short exposures. Four special purpose rafts, mounted at the corners of the LSST science camera, contain wavefront sensors and guide sensors. Wavefront measurements are accomplished using curvature sensing, in which the spatial intensity distribution of stars is measured at equal distances on either side of focus by CCD detectors. The four Corner Rafts also each hold two guide sensors. The guide sensors monitor the locations of bright stars to provide feedback that controls and maintains the tracking of the telescope during an exposure. The baseline sensor for the guider is a Hybrid Visible Silicon hybrid-CMOS detector. We present here a conceptual mechanical and electrical design for the LSST Corner Rafts that meets the requirements imposed by the camera structure, and the precision of both the wavefront reconstruction and the tracking. We find that a single design can accommodate two guide sensors and one split-plane wavefront sensor integrated into the four corner locations in the camera.

Paper Details

Date Published: 28 July 2010
PDF: 11 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 773662 (28 July 2010); doi: 10.1117/12.857829
Show Author Affiliations
Kirk Arndt, Purdue Univ. (United States)
Vincent Riot, Lawrence Livermore National Lab. (United States)
Enver Alagoz, Purdue Univ. (United States)
Alec Biccum, Purdue Univ. (United States)
Andy Bohn, Purdue Univ. (United States)
Joseph Clampit, Purdue Univ. (United States)
Tony Coiro, Purdue Univ. (United States)
Wei Cui, Purdue Univ. (United States)
Liz Hoffman, Purdue Univ. (United States)
Alan Lichti, Purdue Univ. (United States)
Desiree Skaggs, Purdue Univ. (United States)
Ian Shipsey, Purdue Univ. (United States)
Matt Triano, Purdue Univ. (United States)
Bo Xin, Purdue Univ. (United States)
Kat Ziegler, Purdue Univ. (United States)
John Oliver, Harvard Univ. (United States)
Richard Van Berg, Univ. of Pennsylvania (United States)
Gunther Haller, Stanford Linear Accelerator Ctr. (United States)
Leonid Sapozhnikov, Stanford Linear Accelerator Ctr. (United States)
Scot Olivier, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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