Superconducting magnet system at the 50 GeV proton beam line for the J-PARC neutrino experiment

Toru Ogitsu, Yasuhiro Makida, Takashi Kobayashi, Yasuo Ajima, Yoshikuni Doi, Norio Higashi, Yosuke Iwamoto, Atsuko Ichikawa, Nobuhiro Kimura, Tatsushi Nakamoto, Hirokatsu Ohhata, Takakazu Shintomi, Minoru Takasaki, Ken Ichi Tanaka, Akio Terashima, Akira Yamamoto, Tetsuhiro Obana, Michael Anerella, John Escallier, Ramesh GuptaGeorge Ganetis, Michael Harrison, Animesh Jain, Joe Muratore, Brett Parker, Peter Wanderer

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A neutrino oscillation experiment using the J-PARC 50 GeV 0.75 MW proton beam is planned as a successor to the K2K project currently being operated at KEK. A superconducting magnet system is required for the arc section of the primary proton beam line to be within the space available at the site. A system with 28 combined function magnets is proposed to simplify the system and optimize the cost. The required fields for the magnets are 2.6 T dipole and 19 T/m quadrupole. The magnets are also required to have a large aperture, 173.4 mm diameter, to accommodate the large beam emittance. The magnets will be protected by cold diodes and cooled by forced flow supercritical helium produced by a 4.5 K, 2-2.5 kW refrigerator. This paper reports the system overview and the design status.

Original languageEnglish
Pages (from-to)604-607
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
Publication statusPublished - 2004 Jun


  • Beam line
  • Combined function magnet
  • Neutrino
  • Superconducting magnet


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