Oct 16 – 20, 2016
Europe/Zurich timezone

VUV-sensitive MPPCs for liquid xenon detector in MEG II experiment

Oct 18, 2016, 5:43 PM


Mr Shinji Ogawa (The University of Tokyo)


The MEG II experiment is an upgrade of the MEG experiment to search for the charged lepton flavor violating decay of muon, $\mu^+ \rightarrow e^+ \gamma $. The performance of the liquid xenon (LXe) γ-ray detector will be greatly improved with a highly granular scintillation readout realized by replacing 216 photomultiplier tubes (PMTs) on the γ-ray entrance face with 4092 Mult i-Pixel Photon Counters (MPPCs). For this purpose, we have developed a new t ype of large area MPPC which is sensitive to the LXe scintillation light in vacuum ultraviolet (VUV) range, in collaboration with Hamamatsu Photonics K. K. This MPPC is a discrete array of four $6 \times 6 \, \mathrm{mm^2}$ chip, and a sufficiently short time constant for a single photoelectron waveform  is achieved by connecting them in series. An excellent performance of MPP C has been confirmed in our test including high photon detection efficiency (> 15%) for LXe scintillation light. In this presentation, the performance o f our VUV-sensitive MPPC obtained from these tests will be reported.

Primary author

Mr Shinji Ogawa (The University of Tokyo)

Presentation materials