小型方波脉冲磁场装置的研制

Design of miniature square-pulsed magnetic field generator

完成了小型方波脉冲磁场装置的双线圈负载设计,在一定区域内获得了近似匀强磁场。采用阻抗2Ω的6级脉冲形成网络作为初级储能和脉冲形成单元,对匹配电阻放电产生了方波脉冲电流波形。研制了一种场畸变气体火花间隙作为主放电开关,有效减小了装置的动作时延和分散性。实验结果表明:负载中心峰值磁感应强度达到0.04T,方波磁场平顶时间约3μs,平顶度小于5%,上升前沿(磁感应强度峰值10%～90%)小于0.5s,装置的动作时延抖动小于10ns(标准偏差)。

A double-coil load of the miniature square-pulsed magnetic field generator was proposed,and an evenly-distributed magnetic field was obtained in the load area.Six-stage pulse-forming network（PFN） with 2 Ω single-stage characteristic impedance was used as the primary energy storage and pulse-forming element,and it could output a square drive current pulse on the impedance-matched load.Furthermore,a field-distorted gas spark switch was developed as the main switch,and it could effectively reduce the action-delay time and its dispersion of the generator.Experimental results show that the peak value of the magnetic field at the center of the load area is 0.04 T,the flat-top time is about 3 μs,the top-droop ratio is less than 5%,the risetime（10%-90% peak value of magnetic induction） is less than 0.5 μs,and the action-delay-time dispersion of the generator is less than 10 ns（standard deviation）.