具有铁磁回路的螺线管透镜的设计研究

Design Investigation on Solenoid Lens With Ferromagnetic Circuit

文章介绍离子加速器中螺线管透镜优化设计的思路和方法。阐述了采用铁磁回路使螺线管透镜磁感应强度增强的系数κ与螺线管透镜几何参数(rz,tz)的单值关系。基于Poisson程序计算数据,给出了设计螺线管透镜rz、tz、κ的三维曲面图像,并用计算机拟合得到具有较高精度的经验公式。同时,根据该图像,编写了已知rz、tz查询κ的螺线管透镜优化设计的数据库文件SLD Y。运用该文件进行了实际设计,得到了满意的结果。

The paper concerns in the idea and method on optimizing solenoid lens design. The use of ferromagnetic circuit can increase κ times of magnetic field of solenoid lens, and the value of κ can be determined by the geometrical parameter (r_(z),t_(z)) of solenoid lens definitely. A 3-D κ-curved surface was set up with data calculated by Poisson code, and a fitting formula of κ-curved surface was found, which has good accuracy in common use range. Furthermore database file SLD-Y supported κ-curved surface was programmed in order to find κ as known r_(z) and t_(z). Now the database file SLD-Y has been used for our solenoid lens design successfully.