11-13 November 2019
The University of Tokyo, Kashiwa Campus
Asia/Tokyo timezone

Characterization of new photo-detectors for the future dark matter experiments with liquid xenon

12 Nov 2019, 12:21
The University of Tokyo, Kashiwa Campus

The University of Tokyo, Kashiwa Campus

Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba, Japan
Board: 9
Poster DM Direct Detection Poster short presentations


Kosuke Ozaki (Nagoya University)


In the last three decades, numerous terrestrial experiments have been built to detect the faint interactions between WIMP dark matter and ordinary matter. Among them, experiments using dual-phase xenon time projection chambers (TPCs) are leading the search especially for high mass WIMPs. In these experiments, photomultipliers (PMTs) are used to detect the prompt primary scintillation and secondary electro-luminescence of ionized electrons. However, PMTs have several important shortcomings: the residual radioactivity levels, cost, bulkiness, and stability at cryogenic conditions. Therefore, several alternative technologies are under consideration toward the future dark matter experiments using ~50 tons of liquid xenon (LXe). One of the such technologies is silicon photomultipliers (SiPMs). SiPM has very low radioactivity, compact geometry, low operation voltages and reasonable photo-detection efficiency for VUV light. However, current SiPM still has ~two order of magnitude higher dark count rate compared with PMT, which significantly increases accidental coincidence background. In order to solve these problems, we are currently developing a new SiPM with the help of Hamamatsu and FBK. In this poster, we will report the current status of the performance measurements of the Hamamatsu VUV4 SiPMs (3mm×3mm), new SiPMs with less dark count and FBK VUV SiPMs (6mm×6mm).


Nagoya university

Primary author

Kosuke Ozaki (Nagoya University)


Dr Masaki Yamashita (ICRR, the University of Tokyo) Shigetaka Moriyama (ICRR) Shingo Kazama (Nagoya University) Yoshitaka Ito itow

Presentation Materials