正交电磁场中粒子的运动轨迹在拐点处按指数规律变化, 使不同质量离子的轨迹有明显区别, 由此可创建新的电磁核素分离法。从牛顿运动方程出发, 基于单粒子轨道法阐述被分离核素在正交电磁场中的运动规律, 重点找出轨迹的拐点。给出了多质量粒子束在正交电磁场中的质量聚焦特性, 以Li离子为例, 应用MATLAB模拟粒子束的运动轨迹, 结果表明正交电磁场中可实现多质量束流的质量分离。总结出粒子轨迹方程的特点, 为多质量束流分离结构的工程化实现提供参数。研究成果可应用到质量分离器、质谱分析仪及材料提纯等装置的研制中, 同时对于特殊位形电磁场控制多质量束流等相关领域的研究亦有一定的参考价值。

The particle trajectory varies exponentially at turning points in orthogonal electromagnetic field, causing the obvious difference of variety mass ion trajectories. So a new nuclides electromagnetic separation method can be created. From the Newton motion equation and based on the single particle track method, the article discusses the movement law of nuclide separated in orthogonal electromagnetic field and focuses on finding the turning point of the trajectories. The mass focusing characteristics of the multi-mass beam flowing in the orthogonal electromagnetic field are given. As an example, the particle trajectories of Li ion are simulated by MATLAB. The result shows the possibility of the mass separation for the multi-mass particle beam in the orthogonal electromagnetic field. According to the characteristics of the trajectory equation, the particles moving along a circular trajectory are summarized. Parameters such as space dimension for the engineering realization of multi-mass particle beam separation structure are provided. The research result can be applied to the development of some devices, such as the mass separator, the spectrum analyzer and the materials purification device. At the same time, it has certain reference significance for the related fields research of the special configuration electromagnetic field controlling multi-mass beam flow.