DESIGN OF A DIPOLE MAGNET FOR THE 3-GEV PROTON SYNCHROTRON OF THE JAERI/KEK JOINT PROJECT
DESIGN OF A DIPOLE MAGNET FOR THE 3-GEV PROTON SYNCHROTRON OF THE JAERI/KEK JOINT PROJECT
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发表时间：
2002
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通讯作者：
N. Tani;K. Kanazawa;T. Shimada;H. Suzuki;Y. Watanabe;H. Someya
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作者：
N. Tani;K. Kanazawa;T. Shimada;H. Suzuki;Y. Watanabe;H. Someya
我们已经建立了一个原型偶极磁铁。进行了现场测量。本文报道了这种磁体的设计思想和初步试验结果。日本原子能研究所/韩国能源公司联合项目中提出的3-GeV同步加速器是一种快速循环同步加速器（RCS），它以25 Hz的重复率将高强度质子束从400 MeV加速到3-GeV。3-GeV同步加速器用于产生脉冲中子和μ子[1]。它也可以作为50 GeV同步加速器的注入器。由于用于3-GeV同步加速器的磁体需要具有大孔径以实现1 MW的大束功率，因此在端部处存在比通常同步加速器磁体大的泄漏场。此外，25 Hz交流磁场会在磁体部件（例如线圈、磁体端板等）中感应出涡电流。我们打算使用绞合导体作为线圈导体，以便减少线圈中感应出的涡电流。另一方面，在端板中感应的涡电流预计会很大。因此，研究大漏磁场和涡流场对磁体端部附近束流运动的影响具有重要意义。此外，涡流引起的涡流损耗和在磁体的边缘处的涡流场进行了测量，并与一个简单的二维模型进行了比较。该模型假设与时间相关的外场表示为：
We have constructed a prototype dipole magnet. The field measurement has been performed. This paper reports the design concept and the results of the preliminary test about this magnet. The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project 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 [1]. It also works as an injector for a 50-GeV synchrotron. 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 large leakage field at an end part than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components: e.g. a coil, magnet end plates and etc. We intend to use a stranded conductor as a coil conductor so that the eddy current induced in the coil can be reduced. On the other hand, the eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate effects of the large leakage field and the eddy field to the beam motion around the magnet end part. In addition, the eddy loss and the eddy field at the edge of the magnet caused by the eddy current was measured and compared to a simple two-dimensional model. This model supposes that time dependent external field is expressed by: ˆ it ext ext HH e ω