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Super B factories that will further probe the flavor sector of the StandardModel and physics beyond will demand excellent charged particle identification(PID), particularly K/pi separation, for momenta up to 4 GeV/c, as well as theability to operate under beam backgrounds significantly higher than current Bfactory experiments. We describe an Imaging Time-of-Propagation (iTOP) detectorwhich shows significant potential to meet these requirements. Photons emittedfrom charged particle interactions in a Cerenkov radiator bar are internallyreflected to the end of the bar, where they are collected on a compact imageplane using photodetectors with fine spatial segmentation in two dimensions.Precision measurements of photon arrival time are used to enhance the twodimensional imaging, allowing the system to provide excellent PID capabilitieswithin a reduced detector envelope. Results of the ongoing optimization of thegeometric and physical properties of such a detector are presented, as well assimulated PID performance. Validation of simulations is being performed using aprototype in a cosmic ray test stand at the University of Hawaii.

An imaging time-of-propagation system for charged particle identification at a super B factory