双注电子枪中最小二乘法拟合磁场的研究

Study of Least Square Method Matching Magnetic Field of Double-Beam Magnetron Injection Gun

用粒子仿真软件EGUN和MAGIC仿真电子枪时,需设置一组线圈来拟合磁控注入电子枪的磁场.为了提高设计效率,采用最小二乘法计算线圈参数,拟合电子枪磁场,计算结果用于34GHz双注磁控注入电子枪的仿真中,仿真结果表明:最小二乘法能够直接计算出拟合磁场的线圈组合,提高设计电子枪的效率;仿真的双注磁控注入电子枪电子速度零散小,横纵速度比适中,满足回旋管对电子枪的要求.

When simulating double-beam magnetron injection gun using EGUN and MAGIC,electromagnetic coils was used to match magnetic field of magnetron injection gun. Least square method was used to calculate parameters of electromagnetic coils,which was used to match magnetic field of magnetron injection gun. When simulating 34 GHz double-beam magnetron injection gun,the parameters of electromagnetic coils were calculated by least square method. The result of simulation shows that least square method can calculate parameters of solenoid magnets and a 34 GHz double-beam magnetron injection gun with a modest velocity ratio of the beam and a lowvelocity spread was designed.