铀离子引出的两种静电场方法的比较  

Comparison of two electrostatic methods for uranium ion extraction

作　　者：熊家贵[1] 王德武[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2001年第4期9-12,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九五"科技攻关项目! (96 -A18-0 1-0 2 )

摘　　要：为探索用于原子蒸气激光同位素分离 (AVL IS)的简单有效的离子引出方法 ,用二维流体理论电子平衡模型计算比较了 3种静电场方法 :平行板电场法 ,‘Π’型电极法 ,改进‘M’型电极法。计算发现 ,二维流体理论电子平衡模型并不能很好地描述‘Π’型电极法。对另外两种静电场方法 ,计算了不同外加电压、不同的初始原子密度和不同的目标同位素丰度等条件下的离子引出情况。从计算结果可以看出 ,改进‘M’型电极法不论是从离子引出时间还是从碰撞损失率 ,都要比平行板电极法好得多 ;当外加电压较高或初始原子密度较高时 ,这种好处就更加明显。因此 。Simplier and more efficient ion extraction methods for atomic vapor laser isotope separation (AVLIS) were evaluated using a 2 D electron equilibrium model to compute and compare three electrostatic methods: the parallel electrode method, the ‘Π’ type electrode method, and the improved ‘M’ type electrode method. The results show that the 2 D electron equilibrium model can not accurately describe the ‘Π’ type electrode method. For the other two methods, the ion extraction characteristics were computed for various conditions such as applied voltage, initial atom density and abundance of the aimed isotope. The results show that the improved ‘M’ type electrode method is much better than the parallel electrode method regardless of the ion extraction time or the collision loss ratio; and this benefit is more distinct when the applied voltage or the initial atom density is high. Therefore, the improved ‘M’ type electrode method is a better electrostatic method which should be adopted in practice.

关 键 词：离子引出 原子蒸气激光同位素分离 碰撞损失率 静电场法 铀 分离系数 

分 类 号：O562.6[理学—原子与分子物理]