New DAQ system for the CANDLES experiment

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

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A new data acquisition (DAQ) system for the CANDLES experiment was developed using the SpaceWire protocol and the DAQ-Middleware framework. The CANDLES experiment uses a trigger board and Flash Analog-to-Digital Converters (FADCs). The SpaceWire helps us construct the DAQ system with a flexible and multi-path access to FADCs and the trigger board. FADCs have a ring buffer with three buffers to detect sequential decays from backgrounds. We developed the DAQ system with parallel read-out to reduce the dead time at high trigger rates using three read-out personal computers (PCs) that are connected to the three buffers in FADCs one by one. Each PC connects all FADCs and the trigger board and gathers a complete data set of one event without any event builder. The maximum DAQ speed of parallel read-out by three PCs was 2.4 times higher than that of single read-out. In order to collect event data sets from PCs, we built the network distributed DAQ system through Ethernet, which is naturally introduced with the DAQ-Middleware. To realize remote monitoring and histogram modification while the DAQ running, we also developed a dynamic online monitor system independent with the DAQ-Middleware.

Original languageEnglish
Article number7113916
Pages (from-to)1122-1127
Number of pages6
JournalIEEE Transactions on Nuclear Science
Issue number3
Publication statusPublished - 2015 Jun 1
Externally publishedYes


  • DAQ
  • DAQ-middleware
  • Spacewire

ASJC Scopus subject areas

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


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