Speaker
Description
High precision flavor physics measurements are an essential complement to the direct searches for
new physics at the LHC. Such measurements will be performed using the upgraded Belle II detector
that will take data at the SuperKEKB accelerator. With 40x the luminosity of KEKB, the detector
systems must operate effciently at much higher rates than the original Belle detector. A central
element of the upgrade is the barrel particle identification system. Belle II has built and installed
an "imaging-Time-of-Propagation" (iTOP) detector. The iTOP uses quartz optics as Cerenkov
radiators. The photons are transported down the quartz bars via total internally reflection with a
spherical mirror at the forward end to reflect photons to the backward end where they are imaged
onto an array of segmented Multi-Channel Plate Photo-Multiplier Tubes (MCP-PMTs). The system
is readout using gigsample per second waveform sampling ASICs that provide precise photon timing.
The combined timing and spatial distribution of the photons for each event are used to determine
particle species. This presentation will provide an overview of the iTOP system.
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Primary author
External references
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