离子引出的二维PIC-MCC模拟

为探索用于原子蒸气激光同位素分离(AVLIS)的简单有效的离子引出方法,用二维particle-i n-cell with Monte Carlo collision(PIC-MCC)模拟比较了多种方法:平行板电场法,Π型电 极法,改进M型电极法,radio frequency(RF)共振法.模拟发现,磁场为零时的RF共振法不论从 离子引出时间还是从碰撞损失率看都是几种方法中最好的；其次是改进M型电极法.Π型电极 法的模拟结果与2维电子平衡流体模型的结果相差悬殊.RF共振法在有无磁场的不同条件下, 有着相 关键词： 离子引出 原子蒸气激光同位素分离 PIC-MCC

TWO-DIMENSIONAL PIC-MCC SIMULATION OF ION EXTRACTION

To explore more simple and efficient ion extraction methods used in atomic vapor laser isotope separation (AVLIS),two-dimensional(2D) PIC-MCC simulation code is used to simulate and compare several methods: parallel electrode method,Π type electrode method,improved M type electrode method,and radio frequency (RF) reso nance method.The simulations show that,the RF resonance method without magnetic field is the best among others,then the improved M type electrode method.The res ult of simulation of Π type electrode method is quite different from that calcu lated by 2D electron equilibrium model.The RF resonance method with or without m agnetic field has guite different results.Strong resonance occurs in the simulation without magnetic field,whereas no significant resonance occurs under weak magnetic field.And that is quite different from the strong resonance phenomena occurving in the 1D PIC simulation with weak magnetic field.As for practical applications,the RF resonance method without magnetic field has pros and cons, compare d with the M type electrode method.