Title :
Radiation-Resistant Magnets for the Neutrino Beamline at J-PARC
Author :
Hirose, E. ; Tanaka, K.H. ; Takahashi, Hiroki ; Agari, K. ; Ieiri, M. ; Katoh, Y. ; Minakawa, M. ; Muto, R. ; Naruki, M. ; Noumi, H. ; Sato, Yuuki ; Suzuki, Yuya ; Takasaki, M. ; Toyoda, A. ; Yamanoi, Y. ; Watanabe, Hiromi ; Tanaka, Hiroya ; Kato, Kazuhik
Author_Institution :
Beam Channel Group, High Energy Accel. Res. Organ. (KEK), Tsukuba, Japan
fDate :
6/1/2012 12:00:00 AM
Abstract :
The construction of the facility of the long baseline neutrino oscillation experiment using the J-PARC´s 50 GeV-0.75 MW proton beam [1] was completed at the end of 2008. The number of radiation-resistant magnets we have prepared for the neutrino beamline of J-PARC were 15 with Polyimide resin Insulation (PI) against up to 108 Gy, and 4 magnets with completely Mineral Insulation Cable (MIC) for higher radiation dose up to 1011 Gy, and 2 magnets with Epoxy resin Insulation. All magnets were equipped with remote handling system, i.e. automated magnet lifts, quick alignment guides, water connectors, electric power connectors and interlock-signal connectors. On April 23rd 2009, the first proton beam was successfully introduced to the neutrino beamline from the main accelerator of J-PARC and the long baseline oscillation experiment, T2K, started. Now the beamline is operated with 135 kW (30 GeV-4.5 ) primary proton beam. No serious problem happened on magnets until the great East Japan earthquake on March 11th.
Keywords :
accelerator magnets; epoxy insulation; neutrino oscillations; proton accelerators; proton beams; superconducting magnets; J-PARC; alignment guide; automated magnet lift; baseline neutrino oscillation experiment; electric power connectors; electron volt energy 50 GeV; epoxy resin insulation; interlock signal connectors; mineral insulation cable; neutrino beamline; polyimide resin insulation; power 0.75 MW; proton beam; radiation resistant magnet; remote handling system; water connector; Connectors; Electron tubes; Magnetic tunneling; Neutrino sources; Particle beams; Superconducting magnets; Welding; High intensity beamlines; maintenance; radiation-resistant magnet; remote handling;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2011.2175431