Opening a Window of Discovery on the Dynamic Universe

A framework for modeling the detailed optical response of thick, multiple segment, large format sensors for precision astronomy applications

Rasmussen, Andrew et al.
Pierre Antilogus ; Pierre Astier ; Chuck Claver ; Peter Doherty ; Gregory Dubois-Felsmann ; Kirk Gilmore ; Steven Kahn ; Ivan Kotov ; Robert Lupton ; Paul O'Connor ; Andrei Nomerotski ; Steve Ritz ; Christopher Stubbs
Publication Date: 
Monday, August 4, 2014
Conference Papers
SPIE Proceedings
Page #: 
Near-future astronomical survey experiments, such as LSST, possess system requirements of unprecedented fidelity that span photometry, astrometry and shape transfer. Some of these requirements flow directly to the array of science imaging sensors at the focal plane. Availability of high quality characterization data acquired in the course of our sensor development program has given us an opportunity to develop and test a framework for simulation and modeling that is based on a limited set of physical and geometric effects. In this paper we describe those models, provide quantitative comparisons between data and modeled response, and extrapolate the response model to predict imaging array response to astronomical exposure. The emergent picture departs from the notion of a fixed, rectilinear grid that maps photo-conversions to the potential well of the channel. In place of that, we have a situation where structures from device fabrication, local silicon bulk resistivity variations and photo-converted carrier patterns still accumulating at the channel, together influence and distort positions within the photosensitive volume that map to pixel boundaries. Strategies for efficient extraction of modeling parameters from routinely acquired characterization data are described. Methods for high fidelity illumination/image distribution parameter retrieval, in the presence of such distortions, are also discussed.
Bibtex reference: 
@INPROCEEDINGS{2014SPIE.9150E..17R, author = {{Rasmussen}, A. and {Antilogus}, P. and {Astier}, P. and {Claver}, C. and {Doherty}, P. and {Dubois-Felsmann}, G. and {Gilmore}, K. and {Kahn}, S. and {Kotov}, I. and {Lupton}, R. and {O'Connor}, P. and {Nomerotski}, A. and {Ritz}, S. and {Stubbs}, C.}, title = "{A framework for modeling the detailed optical response of thick, multiple segment, large format sensors for precision astronomy applications}", booktitle = {Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series}, year = 2014, series = {Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series}, volume = 9150, archivePrefix = "arXiv", eprint = {1407.5655}, primaryClass = "astro-ph.IM", month = aug, eid = {915017}, pages = {915017}, doi = {10.1117/12.2057411}, 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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