为了达到更加均匀的离子出射方向,从而改善空间飞行器的操控性能,利用粒子模拟方法研究了外磁场对离子发动机中喷射离子的约束.在给定推力情况下,计算了氙离子密度和喷射速度的关系;分析了氙离子间相互作用势能和氙离子动能的比值;根据氙离子磁化条件,计算得到所需磁场强度大于15 T;利用粒子模拟方法对比了外磁场等于15 T和外磁场等于0两种情况下氙离子在垂直于磁场方向的扩散系数.研究表明,强度为15 T的外磁场对氙离子的约束性能有限.“,”In order to produce a more uniform exit direction for the expulsive ions of ion thruster,a particle simulation is performed to study the confinement of xenon ions by external magnetic field.As a necessary step,the correlation is calculated between ions density and the exhaust velocity of the accelerated ions with a specific thrust.Furthermore,the ratio of mean interaction potential energy of the ions to mean thermal kinetic energy of the ions is analyzed.According to the magnetized condition for xenon ions,the required magnetic field is estimated for confining the xenon ions is B≥15 T.The perpendicular diffusion of xenon ions in the presence and absence of magnetic field are compared.It is shown that magnetic field with B=15 T only brings a slight confinement to the ions.