Opening a Window of Discovery on the Dynamic Universe

LSST optical beam simulator

Tyson, J. Anthony et al.
J. Sasian ; K. Gilmore ; A. Bradshaw ; C. Claver ; M. Klint ; G. Muller ; G. Poczulp ; E. Resseguie
Publication Date: 
Wednesday, July 23, 2014
Conference Papers
SPIE Proceedings
Page #: 
We describe a camera beam simulator for the LSST which is capable of illuminating a 60mm field at f/1.2 with realistic astronomical scenes, enabling studies of CCD astrometric and photometric performance. The goal is to fully simulate LSST observing, in order to characterize charge transport and other features in the thick fully-depleted CCDs and to probe low level systematics under realistic conditions. The automated system simulates the centrally obscured LSST beam and sky scenes, including the spectral shape of the night sky. The doubly telecentric design uses a nearly unit magnification design consisting of a spherical mirror, three BK7 lenses, and one beam-splitter window. To achieve the relatively large field the beam-splitter window is used twice. The motivation for this LSST beam test facility was driven by the need to fully characterize a new generation of thick fully-depleted CCDs, and assess their suitability for the broad range of science which is planned for LSST. Due to the fast beam illumination and the thick silicon design [each pixel is 10 microns wide and over 100 microns deep] at long wavelengths there can be effects of photon transport and charge transport in the high purity silicon. The focal surface covers a field more than sufficient for a 40×40mm LSST CCD. Delivered optical quality meets design goals, with 50% energy within a 5 micron circle. The tests of CCD performance are briefly described.
Bibtex reference: 
@INPROCEEDINGS{2014SPIE.9154E..15T, author = {{Tyson}, J.~A. and {Sasian}, J. and {Gilmore}, K. and {Bradshaw}, A. and {Claver}, C. and {Klint}, M. and {Muller}, G. and {Poczulp}, G. and {Resseguie}, E.}, title = "{LSST optical beam simulator}", booktitle = {Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series}, year = 2014, series = {Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series}, volume = 9154, archivePrefix = "arXiv", eprint = {1411.5667}, primaryClass = "astro-ph.IM", month = jul, eid = {915415}, pages = {915415}, doi = {10.1117/12.2055604}, adsurl = {}, adsnote = {Provided by the SAO/NASA Astrophysics Data System} }

Financial support for LSST comes from the National Science Foundation (NSF) through Cooperative Agreement No. 1258333, the Department of Energy (DOE) Office of Science under Contract No. DE-AC02-76SF00515, and private funding raised by the LSST Corporation. The NSF-funded LSST Project Office for construction was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA).  The DOE-funded effort to build the LSST camera is managed by the SLAC National Accelerator Laboratory (SLAC).
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