Schedule 1 4:30 PM - 4:45 PM [XOPT-1-03] Contrast optimization for two-pulse X-ray Speckle Visibility Spectroscopy experiment *Yanwen Sun1,2, Aymeric Robert1, Diling Zhu1 (1. Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2. Physics Department, Stanford University)