Focusing characteristics of intense beam solenoid lens
Focusing characteristics of intense beam solenoid lens
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DOI：
10.1063/1.1149908
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发表时间：
1999-07
影响因子：
1.6
通讯作者：
An Sun;B. H. Sun
中科院分区：
文献类型：
--
作者：
An Sun;B. H. Sun
本文通过求解柱坐标系中强流光束的非线性包络方程，得到了束流半径和束发散角随参数(螺线管透镜中的磁感应强度、束流强度的特征量、束流发射度、初始束流半径和初始束散角)的变化关系。通过对这些关系的理论分析，得到了螺线管透镜中的束峰半径和束峰位置，以及理想聚焦情况下的束腰半径和束腰位置。在理想的聚焦条件下，强束螺线管透镜的半径不应小于束峰半径；螺线管透镜的长度不应小于束峰位置；要获得最佳聚焦，应选择最佳长度；磁感应强度不得低于通过螺线管透镜获得聚焦光束的阈值，并应选择其最佳值，以获得最佳聚焦输出光束的出射端口处的光束发散角的最小值。本文的结论对强流螺线管磁透镜的设计和运行具有一定的指导意义。
In this article, by solving the nonlinear envelope equation of the intense beam in the cylindrical coordinate system, we have obtained the varying relations of the beam radius and the beam divergent angle with the paramedics (the magnetic induction strength in solenoid lens, the characteristic quantity of beam intensity, the beam emittance, the initial beam radius, and initial beam divergent angle). By theoretical analysis for the relations, we have obtained the beam peak radius and beam peak position in solenoid lens, the beam waist radius and beam waist position in the case of perfect focusing. In the ideal focusing condition, the radius of intense beam solenoid lens should not be less than the beam peak radius; the length of the solenoid lens must not be less than the beam peak position; and in order to gain optimum focusing, an optimal length should be selected; the magnetic induction strength must not be less than the threshold for getting a focusing beam through solenoid lens, and its optimum value should be selected so as to obtain the minimum value of beam divergent angle at the exit port for getting an perfect focusing output beam. The conclusions in this article have some guiding significance for the design and operation of the intense beam solenoid magnetic lens.