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Watanabe, Masao; Irie, Yoshiro; Kamiya, Junichiro; Shimada, Taihei; Takayanagi, Tomohiro; Suzuki, Hiromitsu; Watanabe, Yasuhiro; Kawakubo, Toshimichi*
IEEE Transactions on Applied Superconductivity, 16(2), p.1354 - 1357, 2006/06
Times Cited Count:0 Percentile:0(Engineering, Electrical & Electronic)Septum magnets used in the injection and extraction section of the 3 GeV rapid cycling synchrotron of the J-PARC require large aperture for low-loss operations of high intensity beam, protection against the high radiation and the high durability to avoid the maintenance after the high activation. A prototype septum magnet was constructed. Magnetic fields in the gap of the core and leakage field outside of the magnetic shield were measured by a Hall device probe. The experimental results were compared with the 3D calculation by TOSCA. The leakage field of the measurements is larger than the one of the model. After we made a more detailed model, it cleared that many bolt holes which fasten a return yoke narrow the effective sectional area and thus reduce the permeability at the return yoke, making the leakage field larger. Because the thickness of the return yoke is not sufficient, magnetic flux density approaches saturation easily. Moreover, we discuss about the results of heat measurements of the magnet and efficiency of water cooling.
Watanabe, Masao; Irie, Yoshiro; Kamiya, Junichiro; Shimada, Taihei; Takayanagi, Tomohiro; Fujimori, Hiroshi*; Igarashi, Susumu*; Kawakubo, Toshimichi*; Nakayama, Hisayoshi*
IEEE Transactions on Applied Superconductivity, 16(2), p.1350 - 1353, 2006/06
Times Cited Count:2 Percentile:18.87(Engineering, Electrical & Electronic)Thick septa are used in the injection and extraction section of the 3 GeV rapid cycling synchrotron of the J-PARC. We have been designing seven thick septum magnets, two for injection, two for beam dump and three for extraction, respectively. These septa require low-loss operations. For the mechanical stability they are operated by direct current. The yoke is made of the soft-iron block. We have been designing them by using the three-dimensional magnet static field calculation code, TOSCA. In this presentation, we discuss about magnetic field flatness in the gap and effects of the leakage fields in the synchrotron.
Abe, Hiroshi; ; *; *; *; *; Kaneta, Takayoshi*; *; Suzuki, Hiromitsu; Tani, Norio; et al.
JAERI-Research 97-068, 51 Pages, 1997/10
no abstracts in English
原田 寛之
not registered
【課題】電極への衝突を回避しつつ荷電粒子ビームを適切に操作可能な荷電粒子ビーム操作装置を提供する。 【解決手段】荷電粒子ビーム操作装置は、荷電粒子ビームの進行方向に直交する第1方向において荷電粒子ビームを挟んで反対側に配置され、進行方向及び第1方向に直交する第2方向に延設された一対の第1電極12,13と、第2方向において荷電粒子ビームを挟んで反対側に配置され、各々が一対の第1電極それぞれと電気的に接続された一対の第2電極14,15とを備え、一対の第1電極と12,13、一対の第2電極14,15との間に電位差が付与されることを特徴とする。