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Magnetic field measurements, 3D field calculation and heat measurements of a prototype thick septum magnet for 3 GeV rapid cycling synchrotron of J-PARC

Watanabe, Masao ; Irie, Yoshiro; Kamiya, Junichiro  ; Shimada, Taihei ; Takayanagi, Tomohiro  ; Suzuki, Hiromitsu; Watanabe, Yasuhiro ; Kawakubo, Toshimichi*

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.

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Category:Engineering, Electrical & Electronic

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