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| WEPKF041 |
Permanent Magnet Generating High and Variable Septum Magnetic Field and its Deterioration by Radiation
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1696 |
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- T. Kawakubo, E. Nakamura, M. Numajiri
KEK, Ibaraki
- M. Aoki, T. Hisamura, E. Sugiyama
NEOMAX Co., Ltd., Mishima-gun, Osaka
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Conventional high field septum magnet is fed by DC current or pulse current. In the case of DC, the problem of coil support is not very important, but the cooling of the coil is serious problem. While, in the case of pulse, the problem of support is much important than that of cooling. However, if the septum magnet is made of permanent magnet, those problems are dissolved. And the cost for electricity and cooling water can be exceedingly decreased. Therefore, we made the model septum magnet which has 1/4 scale of the real size and generates 1[T] with the variable range of ± 10%. The magnetic field distribution in the gap by changing the representative field is reported. When this permanent magnet is set in an accelerator, the deterioration of the permanent magnet by radiation will be serious problem. We also report the dependence of the magnetic fields generated by permanent magnet samples on accumulated radiation by various types of radiation source.
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