Jul 10 – 17, 2019
Europe/Brussels timezone

First Experiences with the Novel Time of Propagation (TOP) Barrel PID Detector in the Belle II Experiment

Jul 11, 2019, 11:30 AM
Campus Ledeganck - Aud. 4 (Ghent)

Campus Ledeganck - Aud. 4


Parallel talk Detector R&D and Data Handling Detector R&D and Data Handling


Oskar Hartbrich (University of Hawaii at Manoa)


The Time of Propagation (TOP) detector is a novel particle identification system developed for the barrel region of the Belle II experiment at the SuperKEKB collider at KEK in Tsukuba, Japan. The detector is based on reconstructing the emission angle of Cherenkov photons generated in its quartz radiator bars by measuring the propagation time of individual photons to the Micro-Channel Plate PMT sensor plane. The readout electronics for the 8192 channels of the TOP system are built around a switched capacitor array waveform sampling ASIC operating at 2.7GSa/s. Acquired waveforms are processed in real time in the front end electronics, extracting the individual timing of detected photons to better than 100 ps.

After a commissioning run with first beam collisions starting in spring 2018, the final inner tracking system is now installed in the Belle II detector, and the physics programme and luminosity rampup is underway since March 2019.

This talk presents the current experiences and results from commissioning, calibration and operation of the Belle II TOP detector in the first Belle II physics runs up until now.

Primary author

Oskar Hartbrich (University of Hawaii at Manoa)

Presentation materials