The Belle II time-of-propagation counter

11 Jun 2011, 11:25
25m
Erie (Sheraton Hotel)

Erie

Sheraton Hotel

Oral Presentation Particle Identification Particle ID Detectors

Speaker

Dr Kurtis Nishimura (University of Hawaii)

Description

The Belle II detector operating at the SuperKEKB accelerator will utilize the time-of-propagation (TOP) counter as its primary particle identification device in the barrel region. The TOP counter is a compact variant of the detection of internally reflected Cherenkov light (DIRC) technique, which trades the imaging-based performance of a traditional DIRC with fast timing provided by micro-channel plate (MCP) PMTs. In order to read out a large number of such MCP-PMT channels with high precision, an electronics system based on waveform sampling ASICs is being developed. Full waveforms from front-end ASICs are transmitted by fiberoptic links to digital signal processors, which extract the precise charges and times necessary for the final reconstruction. A lower resolution set of timing data is also produced by the front end, collected from all modules, and passed to provide order ~ns event timing to the global trigger. We discuss the general principles of TOP operation and the planned Belle II TOP system, which is expected to provide 4 sigma or better separation of kaons and pions up to momenta of approximately 4 GeV/c.

Author

Dr Kurtis Nishimura (University of Hawaii)

Presentation materials