The CANDLES trigger system for the study of double beta decay of 48Ca

T. Maeda, S. Ajimura, W. M. Chan, K. Fushimi, R. Hazama, K. Ichimura, T. Iida, Y. Inukai, T. Ishikawa, H. Kakubata, T. Kishimoto, K. Matsuoka, K. Nakajima, N. Nakatani, M. Nomachi, I. Ogawa, T. Ohata, H. Ohsumi, M. Saka, K. SakamotoK. Seki, Y. Sugaya, K. Suzuki, Y. Tamagawa, D. Tanaka, K. Tetsuno, V. T.T. Trang, S. Umehara, W. Wang, S. Yoshida, M. Yoshizawa

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The CANDLES experiment is a study of the double beta decay of 48Ca nuclei. The detector consists of two scintillators. One is the CaF2 crystal that acts as a source of double beta decay and a scintillator. The other is a liquid scintillator, which is used for gamma-veto. The total light collected from the liquid scintillator is on the same order of magnitude as that of the CaF2 scintillator, but the decay constant of the liquid scintillator is one or more orders of magnitude shorter than that of the CaF2 scintillator. Therefore, if we trigger the signal by pulse height, the energy threshold of the liquid scintillator light will be one or more orders of magnitude lower than that of the CaF2 scintillator. A high counting rate in the liquid scintillator causes deadtime; in order to avoid this problem, we have developed a new trigger system. In this paper, we describe the use of this trigger system in the CANDLES experiment and its performance after installation in 2013.

Original languageEnglish
Article number7104181
Pages (from-to)1128-1134
Number of pages7
JournalIEEE Transactions on Nuclear Science
Issue number3
Publication statusPublished - 2015 Jun 1
Externally publishedYes


  • Digital signal processing
  • field-programmable gate arrays (FPGAs)
  • trigger circuits

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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