同轴磁控管永磁磁路的模拟及实验  

Permanent magnetic circuits in a coaxial magnetron of medical linear accelerators

作　　者：张洁熹[1] 李泉凤[1] 韩运生[1] 裘家琪[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第8期1248-1251,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家科技支撑计划资助项目(2006BAI03A15)

摘　　要：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。Miniaturization of the circuitry in a coaxial magnetron is one of the most important ways to miniaturize medical linear accelerators. Sm-Co permanent magnets were used in the magnetic circuitry of a coaxial magnetron to produce a small volume, high intensity magnetic field. The Poisson Superfish Code was used to simulate the magnetic field of the circuits. The stimulated and experimental measurements show that Sin-Co permanent magnet can produce a fairly high intensity magnetic field in coaxial magnetron. However, Sm-Co permanent magnets are easily influenced by processing methods and temperatures, so actual magnetic fields cannot completely meet the design requirement. Therefore, a new electron-permanent magnet circuitry with optimized magnetic field distribution was designed.

关 键 词：直线加速器 钐钴永磁 磁路 磁场分布 POISSON Superfish程序 

分 类 号：O572.211[理学—粒子物理与原子核物理] TL53[理学—物理]