粒子束空间传输影响因素及应对方法

全面分析了初始束流分布、发散度、能散度以及地磁场对粒子束空间传输的影响情况,并针对束流长距离传输的静电扩散和地磁偏转效应进行了数值建模及定量的数值仿真研究。结果表明,对于固定束流能量、流强粒子束,可通过增大初始半径削弱粒子束静电扩散效应达到设计要求；通过背景磁场精确预测,可准确控制束流方向精度。可以看出,研究带电粒子束本身的自洽行为以及与外场的作用,对带电粒子束流的产生、传输特性研究及工程化应用都有重要意义。

Influence factors and coping strategies about the space transmission of particle beam

The effects of initial beam distribution, divergence, energy divergence and geomagnetic field on the spatial transmission of particle beams were comprehensively analyzed, and the numerical modeling and quantitative numerical simulation of electrostatic diffusion and geomagnetic deflection effects were carried out. The simulation result shows that for particle beam with fixed beam energy and beam intensity, the electrostatic diffusion effect of the particle beam can be weakened by increasing the initial radius, and the exact direction of beam can be accurately predicted through accurate measurement of magnetic field. It can be seen that research on self-consistent force of charged particle beam and its interaction with external field is great significant to the study of generation, transport characteristics and engineering application of the particle beam.