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为了得到试验测量不到的气体放电过程中电磁场作用下单个原初电子的动力学行为,建立了LIPS-200离子推力器放电室二维仿真模型,应用网格粒子法(PIC)和蒙特卡洛碰撞(MCC)模拟法对其进行了研究。模拟得到在额定工况下原初电子和中性原子之间的碰撞概率、原初电子损耗率、电磁场分布对其运动速度及运动轨迹的影响等。结果表明磁铁表面磁感强度最大,越靠近放电室内部磁感强度越小,对称轴区域无磁场分布,原初电子在电磁场作用下沿磁力线作加速螺旋运动;运动等离子体的自洽电势大小范围仅为0~2.0V,几乎不会影响等离子体运动;对应总原初电子个数为1.2×106时直接被阳极表面吸收的损耗率仅为0.02%。
In order to obtain the kinetic behavior of a single primary electron under the influence of electromagnetic field during gas discharge, the two-dimensional simulation model of LIPS-200 ion thruster discharge chamber was built. The particle particle method (PIC) and Monte Carlo collision (MCC) simulation method to study it. The simulation results show that the collision probability of primary electrons and neutral atoms, the primary electron loss rate, the influence of electromagnetic field distribution on the movement speed and trajectory under the rated conditions are obtained. The results show that the magnetic induction of the magnet surface is the largest. The closer the magnetic induction intensity is to the interior of the discharge chamber, the less magnetic field is distributed in the axis of symmetry. The primary electrons make helical movement along the lines of force under the action of electromagnetic field. Is 0 ~ 2.0V, almost does not affect the plasma movement; corresponding to the total number of primary electrons is 1.2 × 106 directly absorbed by the anode surface of the loss rate of only 0.02%.