| Paper |
Title |
Page |
| 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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| MOPLT070 |
FFAG as Phase Rotator for the PRISM Project
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713 |
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- A. Sato, M. Aoki, Y. Arimoto, Y. Kuno, M. Yoshida
Osaka University, Osaka
- Y. Iwashita
Kyoto ICR, Uji, Kyoto
- S. Machida, Y. Mori, C. Ohmori, T. Yokoi, K. Yoshimura
KEK, Ibaraki
- S. Ninomiya
RCNP, Osaka
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A Fixed Field Alternating Gradient (FFAG) ring will be used as a phase rotator in the PRISM project. We report a design of the PRISM-FFAG in this paper. PRISM stands for "Phase Rotated Intense Slow Muon beam". It is a project to realize a super muon beam, which combines high-intensity, low-energy, narrow energy-spread and high purity. Its aimed intensity is about 1011-1012 muons per sec. The muon beam will be provided with a low kinetic energy of 20MeV to optimize for the stopped muon experiments. FFAG has some advantageous characteristics to achieve such superb beam. These are a large momentum (longitudinal) acceptance, a wide transverse acceptance with strong focusing, and synchrotron oscillation, which is needed to perform phase rotation. According to simulations, initial energy spread of 20MeV±40% is reduced down to ±6% after 5 turns of muons in the FFAG ring. In the FFAG ring almost all pions decay into muon, hence extracted beam has extremely low pion contamination. A program to construct the PRISM-FFAG ring has been started. It would be completed by the end of JFY 2005.
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