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同轴磁控管磁路的小型化是使医用直线加速器尺寸小型化的重要途径。将具有优良电磁性能的钐钴永磁用于同轴磁控管磁路系统中,可以以较小体积激励出磁感应强度高的近均匀磁场。结合Poisson Superfish程序模拟和实验测量对同轴磁控管的永磁磁路系统产生的高强度磁场分布进行了分析,结果表明:钐钴永磁材料在同轴磁控管中能产生基本满足高强度和均匀性要求的工作磁场。改进了设计方案,设计了一个电磁-永磁复合磁路,通过调节电流密度使磁场分布调至最佳状态。
The miniaturization of the coaxial magnetron magnetic circuit is an important way to miniaturize the size of the medical linear accelerator. The use of samarium cobalt permanent magnets with excellent electromagnetic properties in coaxial magnetron magnetic circuit system can excite a nearly uniform magnetic field with high magnetic induction with a small volume. Combined with the Poisson Superfish program simulations and experimental measurements, the magnetic field distribution in the PM system of the coaxial magnetron was analyzed. The results show that the SmCo permanent magnetic material can produce high magnetic field in the coaxial magnetron Work magnetic field required for strength and uniformity. The design scheme is improved and an electromagnetic-permanent magnet compound magnetic circuit is designed. By adjusting the current density, the magnetic field distribution is adjusted to the best condition.