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Sakashita, K.

Paper Title Page
MOPEB033 Operation of Superconducting Combined Function Magnet System for J-PARC Neutrino Beam Line 343
 
  • T. Ogitsu, Y. Ajima, O. Araoka, Y. Fujii, N. Hastings, N. Higashi, M. IIda, N. Kimura, T. Kobayashi, Y. Makida, T. Nakadaira, T. Nakamoto, H. Ohhata, T. Okamura, K. Sakashita, K. Sasaki, M. Shibata, S. Suzuki, K. Tanaka, A. Terashima, T. Tomaru, A. Yamamoto
    KEK, Ibaraki
  • A. Ichikawa
    Kyoto University, Kyoto
  • H. Kakuno
    University of Tokyo, Tokyo
  
 

A su­per­con­duct­ing mag­net sys­tem for the J-PARC neu­tri­no beam line was com­plet­ed at the end of 2008. The sys­tem con­sists of 14 dou­blet cryostats; each con­tains 2 com­bined func­tion mag­nets (SCFM). The SCFM uses two sin­gle layer left/right asym­met­ric coils that pro­duce a dipole field of 2.6 T and quadrupole of 19 T/m. By 2008, the world first SCFM had been de­vel­oped and test­ed suc­cess­ful­ly at KEK. The mass-pro­duc­tion was start­ed in 2005, and com­plet­ed by sum­mer 2008. The sys­tem in­stal­la­tion and com­mis­sion­ing took place from Feb. 2008 to Mar. 2009. The beam op­er­a­tion was start­ed in April 2009 and the first neu­tri­no beam was gen­er­at­ed on April 23rd. Since then beam op­er­a­tion and com­mis­sion­ing to in­crease beam in­ten­si­ty has been per­formed to achieve the near term mile­stone of 100 kW beam op­er­a­tion. The paper briefly sum­ma­rizes the his­to­ry of SCFM de­vel­op­ment and the sys­tem con­struc­tion as an in­tro­duc­tion to a dis­cus­sion on beam op­er­a­tion ex­pe­ri­ence of the SCFM sys­tem.