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SUMMARY:Characterization of new photo-detectors for the future dark matter
  experiments with liquid xenon
DTSTART;VALUE=DATE-TIME:20191112T032100Z
DTEND;VALUE=DATE-TIME:20191112T032200Z
DTSTAMP;VALUE=DATE-TIME:20250110T182849Z
UID:indico-contribution-1571@indico.icrr.u-tokyo.ac.jp
DESCRIPTION:Speakers: Kosuke Ozaki (Nagoya University)\nIn the last three 
 decades\, numerous terrestrial experiments have been built to detect the f
 aint 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 scintillatio
 n and secondary electro-luminescence of ionized electrons. However\, PMTs 
 have several important shortcomings: the residual radioactivity levels\, c
 ost\, bulkiness\, and stability at cryogenic conditions. Therefore\, sever
 al 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 radioa
 ctivity\, compact geometry\, low operation voltages and reasonable photo-d
 etection efficiency for VUV light. However\, current SiPM still has ~two o
 rder of magnitude higher dark count rate compared with PMT\, which signifi
 cantly increases accidental coincidence background. In order to solve thes
 e problems\, we are currently developing a new SiPM with the help of Hamam
 atsu and FBK.  In this poster\, we will report the current status of the p
 erformance measurements of the Hamamatsu VUV4 SiPMs (3mm×3mm)\, new SiPMs
  with less dark count and FBK VUV SiPMs (6mm×6mm).\n\nhttps://indico.icrr
 .u-tokyo.ac.jp/event/259/contributions/1571/
LOCATION:The University of Tokyo\, Kashiwa Campus
URL:https://indico.icrr.u-tokyo.ac.jp/event/259/contributions/1571/
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