Pres. @I Astronomical Telescope & Instn~meiztation Symposium Orlando, FL, 24-31 May (2006) BNL-75847-2006-CP STUDY OF SILICON THICKNESS OPTIMIZATION FOR LSST* P. O'Connor", V. Radeka", D. Figerb, J. G. Geary', D. K. Gilmored, J. Oliver", C. W. Stubbsf, P. Z. Takacsa, and J. A. Tysong "Brookhaven National Laboratory, Upton, NY 11973 'Space Telescope Science Institute, Baltimore, MD 2121 8 'Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 dStanfordLinear Accelerator Center, Stanford, CA "Harvard Univ. Lab. for Particle Physics and Cosmology, Cambridge, MA 02138 Department of Physics, Harvard Univ., Cambridge, MA 02138 gUniversityof Califoimia, Davis, CA 95616 f May, 2006 *Thismanuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The United States Government retains, and the publisher, by accepting the article for publication, acknowledges, a world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for the United States Government purposes.