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Annealing of proton radiation damages in Si-PM at room temperature

Dec 17, 2019, 5:00 PM
20m
Sun: B1F-Meeting rooms#4-6; Mon-Wed: B2F-RAN (International Conference Center Hiroshima)

Sun: B1F-Meeting rooms#4-6; Mon-Wed: B2F-RAN

International Conference Center Hiroshima

Peace Memorial Park, Hiroshima-shi
ORAL Radiation damage and radiation tolerant materials Session10

Speaker

Mr Hirade Naoyoshi (Dept. of Physical Science, Hiroshima Univ.)

Description

  CAMELOT (CubeSats Applied for MEasuring and LOcalizing Transients) project plans to launch a group of nano-satellites for detection and position determination of short gamma-ray bursts and other transients. Detector is designed to consist of CsI (TI) scintillator and Silicon Photomultipliers (Si-PMs). Si-PMs can be driven with low voltage (~50 V), high gain (10e6) and small size (~mm), which are suitable for the nano-satellite platform. However, they have been little used in space, and their damages of orbital radiations have not been investigated in detail. As a purpose of this study, we investigated how Si-PM performance recovers after proton-beam irradiation.
  In this experiment, we irradiated Si-PMs (Hamamatsu Photonics K.K: S13360-6050CS) with dose of 300, 1000 and 5000 rad of 200 MeV protons in The Wakasa-wan Energy Research Center in November 2018. The dose of 100 rad is yielded by 6.2e8 200 MeV protons and equivalent to the same number of irradiation with 1 MeV neutron. Then, we measured the performance at two epochs, just after irradiation and after 7 month. Si-PMs were stored at room temperature during these 7 months.
  We measured the energy spectrum of X-ray of 241Am by using 1 cm^3 CsI (TI) and Si-PM irradiated with 300 rad of proton. It shows recovery of the energy threshold by a factor of ~2. Si-PM irradiated by 5000 rad protons had a higher noise and 241Am signals were not able to be detected just after irradiation. As a result of room-temperature annealing during 7 month, a lower energy threshold is achieved and 59.5 keV peak of 241Am is visible. In this paper, we report the recovery of various properties of Si-PM.

Submission declaration Original and unpublished

Primary author

Mr Hirade Naoyoshi (Dept. of Physical Science, Hiroshima Univ.)

Co-authors

Dr Takahashi Hiromitsu (Dept. of Physical Science, Hiroshima Univ) Mr Uchida Nagomi (Dept. of Physical Science, Hiroshima Univ.) Dr Fukazawa Yasushi (Dept. of Physical Science, Hiroshima Univ.) Mr Torigoe Kento (Dept. of Physical Science, Hiroshima Univ.) Dr Mizuno Tsunefumi (Hiroshima Astrophysical Science Center) Mr Hirose Kengo (Dept. of Physical Science, Hiroshima Univ.) Dr Ohno Masanori (Eotvos Univ. ) Dr Yamaoka Kazutaka (ISEE, Nagoya Univ.) Mr Hisadomi Syouhei (Dept. of Physics, Nagoya Univ.) Dr Nakazawa Kazuhiro (Dept. of Physics, Nagoya Univ.) Dr Hatori Satoshi (The Wakasawan Energy Research Center) Dr Kume Kyo (The Wakasawan Energy Research Center) Dr Mizushima Satoshi (The Wakasawan Energy Research Center)

Presentation materials