Commissioning of the new electronics and online system for the Super-Kamiokande experiment

S. Yamada, K. Awai, Y. Hayato, K. Kaneyuki, Y. Kouzuma, S. Nakayama, H. Nishino, K. Okumura, Y. Obayashi, Y. Shimizu, M. Shiozawa, A. Takeda, Y. Heng, B. Yang, S. Chen, T. Tanaka, T. Yokozawa, Y. Koshio, S. Moriyama, Y. AraiK. Ishikawa, A. Minegishi, T. Uchida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


The Super-Kamiokande (SK) detector is a ring imaging Cherenkov detector for neutrino physics and proton-decay search and consists of 50000 tons of pure water equipped with about 13000 photo-multipliers (PMTs). The old front-end electronics and online system running for more than one decade were all upgraded in September, 2008 and the data acquisition was started successfully. The new front-end electronics is based on a charge to time converter (QTC) and a multi-hit TDC. TCP/IP based readout channel is implemented to handle large amounts of data. In the new data acquisition (DAQ) scheme, the hardware event-trigger for the data reduction is replaced by processing all the hits in the online farm, so that we are able to lower the threshold of the detection energy for solar neutrino and analyze consecutive events whose time interval is too long to detect in the previous system. To make the new online system to be capable of processing larger dataflow of up to 470MB/s, we utilize Gigabit and 10Gigabit Ethernet techniques and distribute the load over Linux PCs to handle a large amount of data. In this paper, we will describe the design and performance of the new system in the commissioning.

Original languageEnglish
Title of host publication2009 16th IEEE-NPSS Real Time Conference - Conference Record
Number of pages5
Publication statusPublished - Dec 31 2009
Externally publishedYes
Event2009 16th IEEE-NPSS Real Time Conference - Beijing, China
Duration: May 10 2009May 15 2009

Publication series

Name2009 16th IEEE-NPSS Real Time Conference - Conference Record


Other2009 16th IEEE-NPSS Real Time Conference


  • Data acquisition
  • Event building
  • Front-end electronics
  • Neutrinos

ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Computer Networks and Communications
  • Software
  • Electrical and Electronic Engineering


Dive into the research topics of 'Commissioning of the new electronics and online system for the Super-Kamiokande experiment'. Together they form a unique fingerprint.

Cite this