The following email has been sent to YONEKURA, Takuya:
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Dear Takuya Yonekura,
The submission of your abstract has been successfully processed.
Abstract submitted: https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts.
Status of your abstract: https://indico.cern.ch/event/192695/call- for-abstracts/295/.
See below a detailed summary of your submitted abstract:
Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics
Submitted by: YONEKURA, Takuya
Submitted on: 27 February 2014 12:06
Title: Performance of the MCP-PMTs for the TOP counter in the Belle II experiment
Abstract content We developed the micro-channel-plate (MCP) PMT for the Time-of-Propagation (TOP) counter, which is a novel Cherenkov counter to be used for particle identification in the Belle II experiment. The developed MCP-PMT has excellent performance for single photon detection; a timing resolution of about 40ps (sigma, including readout jitter), a nominal gain as high as 2 x 10^6, and a position sensitivity of about 5mm with 4 x 4 anode. In the Belle II TOP counter, 512 MCP-PMTs are used under a magnetic field of 1.5T. The performance details were inspected with and without the magnetic field. The gain on each anode was found to vary up to a factor of two over the 16 anodes in some of the MCP-PMTs. We will discuss on this issue. The gain was dropped by 20-80% in a 1.5T magnetic field. The reason is considered that the secondary electrons can be localized and the electron amplification can be saturated. The rate of the gain drop seems to have a correlation with the high-voltage applied to obtain the nominal gain. We will discuss on the gain drop and its rate. The photon detection efficiency was also measured in a 1.5T magnetic field. The results on about 300 MCP-PMTs will be reported. Regarding the lifetime of the MCP-PMT, we succeeded in extending the lifetime significantly by introducing the atomic layer deposition technique on MCP coating. The results of the lifetime measurements will be reported.
Summary
Primary Authors: Mr. YONEKURA, Takuya (Nagoya university) yonekura@hepl.phys.nagoya-u.ac.jp
Co-authors: Prof. IIJIMA, Toru (Nagoya university) iijima@hepl.phys.nagoya-u.ac.jp Dr. INAMI, Kenji (Nagoya university) kenji@hepl.phys.nagoya-u.ac.jp Dr. SUZUKI, Kazuhito (Nagoya university) kazuhito@hepl.phys.nagoya-u.ac.jp Dr. MATSUOKA, Kodai (Nagoya university) matsuoka@hepl.phys.nagoya-u.ac.jp Dr. HAYAKAWA, Tomokatsu (Nagoya university) hayakawa@hepl.phys.nagoya-u.ac.jp Dr. KATO, Yuji (Nagoya university) kato@rcnp.osaka-u.ac.jp Dr. SATO, Yutaro (Nagoya university) yutaro@hepl.phys.nagoya-u.ac.jp Mr. HIROSE, Shigeki (Nagoya university) shigeki@hepl.phys.nagoya-u.ac.jp Mr. ITO, Yuhei (Nagoya university) yuhei@hepl.phys.nagoya-u.ac.jp Mr. FURUMURA, Daiki (Nagoya university) furumura@hepl.phys.nagoya-u.ac.jp
Abstract presenters: Mr. YONEKURA, Takuya
Track classification: Sensors: 1d) Photon Detectors
Presentation type: Oral
Comments: