000002733 001__ 2733
000002733 005__ 20211031205208.0
000002733 037__ $$aBELLE2-TALK-CONF-2021-128
000002733 041__ $$aeng
000002733 088__ $$aBELLE2-TALK-DRAFT-2021-095
000002733 100__ $$aKazuki Kojima
000002733 245__ $$aThe operation and performance of the TOP detector at the Belle II experiment
000002733 260__ $$aEPS-HEP2021$$c2021-10-31
000002733 300__ $$a6
000002733 500__ $$a15 minutes (12 minutes presentation + 3 minutes Q&A)  https://indico.desy.de/event/28202/contributions/105605/
000002733 520__ $$aThe SuperKEKB/Belle II experiment, the successor of the KEKB/Belle experiment at KEK, started the physics data taking with the full detector system in March 2019. The Time-of-Propagation (TOP) detector was integrated into the Belle II detector for charged particle identification in the barrel region. The TOP detector mainly consists of quartz radiators, Micro-Channel-Plate (MCP) PMTs, and front-end electronics. It reconstructs a ring image of Cherenkov photons generated by an incident particle. It measures the timing of each detected photon with an accuracy of less than $100~\mathrm{ps}$ for good $K/\pi$ separation. In the operation of the TOP detector, harsh beam-induced background in the high luminosity environment is one of the critical issues to keep the particle identification performance. We developed various tools to monitor MCP-PMT performance and to identify and fix errors arising from front-end electronics during data taking. The TOP detector provides $85\%$ $K$ identification efficiency at a $10\%$ $\pi$ misidentification rate in the data at the early stage of the experiment. In these proceedings, we present the operation status and the performance by the summer of 2021.
000002733 6531_ $$aTOP
000002733 6531_ $$aMCP-PMT
000002733 6531_ $$aEPS-HEP
000002733 6531_ $$aEPS-HEP2021
000002733 6531_ $$aPID
000002733 6531_ $$a2021
000002733 8560_ $$fkojima@hepl.phys.nagoya-u.ac.jp
000002733 8564_ $$uhttps://docs.belle2.org/record/2733/files/Proceedings.pdf$$yBELLE2-TALK-CONF-2021-128
000002733 8564_ $$uhttps://docs.belle2.org/record/2733/files/Slides.pdf$$yBELLE2-TALK-CONF-2021-128 Slides