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Tokuchi, A.

Paper Title Page
TUPLS107 Operation of the Opposite-Field Septum Magnet for the J-PARC Main-Ring Injection 1750
 
  • I. Sakai, Y. Arakaki, K. Fan, Y. Saito, M. Tomizawa, M. Uota
    KEK, Ibaraki
  • A.K. Kawasaki, H. Mori, A. Tokuchi
    NICHICON, Shiga
  • Y. Morigaki, A. Nishikawa
    IHI/Yokohama, Kanagawa
 
  The opposite field septum magnet system has been applied to the injection system of the J-PARC 50-GeV proton synchrotron. The features of the system are a force-free structure, easy pulse excitation and the possibility of a large-aperture, thin-septum structure. The septum magnet has the structure of an inside-vacuum to eliminate the thickness of the vacuum-chamber walls and electric-insulation layer to make the septum thickness as thin as possible. However the magnet cores and return coils are outside of the vacuum to reduce the out-gassing rate of the vacuum system. Finally, the larger beam aperture than the full acceptance of the ring and larger separation angle can be obtained at the septum magnet for low-loss injection. In this paper we will introduce the methods to eliminate the error fields caused by fabrication errors and eddy current with pulse excitation and stability of high current power supply of 50 kA.