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针对在高能医用驻波直线加速器 2 70°偏转磁铁系统的理论设计过程中 ,使用等效边界方法忽略了边缘场影响的问题 ,按照 EFF(Extended Fringing Field)理论计算所得结果重新校正原来设计的电子轨迹 ,并采用粒子跟踪的模拟方法 ,模拟电子在 2 70°偏转系统中的偏转过程 ,将模拟结果与 EFF理论计算结果进行比较 ,分析指出在 2 70°偏转磁铁系统中加磁屏蔽的意义 ,从而从理论上指导 2 70°偏转磁铁系统的安装 ,即将靶从原安装位置处向左调整 5 mm。
For the theoretical design of a 70° deflection magnet system in a high-energy medical VSWR linear accelerator, the equivalent boundary method was used to ignore the influence of the fringe field, and the results calculated in the EFF (Extended Fringing Field) theory were used to recalibrate the originally designed electrons. The trajectory and the particle tracking simulation method were used to simulate the deflection process of the electrons in the 270° deflection system. The simulation results were compared with the EFF calculation results. The significance of magnetic shielding in the 270° deflection magnet system was analyzed. This theoretically guides the installation of the 2 70° deflection magnet system, ie the target is adjusted 5 mm to the left from the original mounting position.