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Eddy current effect of magnets for J-PARC 3-GeV synchrotron

J-PARC 3-GeVシンクロトロン電磁石の渦電流効果

谷 教夫  ; 安達 利一*; 染谷 宏彦*; 渡辺 泰広  ; 佐藤 皓*; 木代 純逸

Tani, Norio; Adachi, Toshikazu*; Someya, Hirohiko*; Watanabe, Yasuhiro; Sato, Hikaru*; Kishiro, Junichi

J-PARC 3GeV陽子シンクロトロンは25Hzの速い繰り返しで電磁石を励磁するため、渦電流によって励磁されるeddy field及び電磁石端部での発熱が非常に大きな問題となる。われわれは電磁石端部の漏れ磁場と渦電流の評価を行うための試験を行った。本論文では、偏向電磁石や四極電磁石における試験の結果について報告する。

The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project (J-PARC) is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400-MeV to 3-GeV at a repetition rate of 25-Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a larger fringe field at a pole end than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components, magnet end plates and etc. The eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate an effect of large leakage field and eddy current to the beam motion around the magnet end part. We have measured the eddy loss and the eddy field at the edges of the dipole and quadrupole magnets. In this paper, we report the comparison between the results of the measurements and the two-dimensional eddy current model developed for this study.

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パーセンタイル:51.18

分野:Engineering, Electrical & Electronic

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