多脉冲励磁下铁氧体及非晶磁环的磁特性

Magnetic characteristics of ferrite and amorphous cores under MHz repetition-rate multi-pulse excitation

感应脉冲加速器的磁芯通常为铁氧体或非晶材料,而感应腔磁芯在工作脉冲下的磁性能是决定感应加速脉冲波形好坏的重要因素。搭建了低压多脉冲实验平台对铁氧体和非晶小磁环分别进行MHz重复频率的多脉冲励磁,对励磁线圈上的电压电流波形进行监测,绘制了多脉冲励磁下磁环的磁化曲线,并结合含磁芯线圈动态电感量的递推公式计算出磁环在多脉冲励磁过程中磁导率的变化曲线;在高压三脉冲实验平台上对铁氧体磁芯和非晶磁芯实验感应腔进行了高压三脉冲实验,得到的磁芯多脉冲磁化规律与低压实验的结果一致。最后对两种磁环在多脉冲励磁下的磁性能差异进行了对比分析。

Experiments have been done to study the magnetic characteristics of the magnetic cores under MHz repetition-rate multi-pulse excitation in the multi-pulse inductive accelerator.With a low-voltage（～1 kV） multi-pulse power system based on the MOSFET solid state switch,the permeabilities of a ferrite core and a amorphous core have been obtain,as well as their magnetization curves under multi-pulse excitation.Significant differences in the experimental results show that the amorphous core is more fit in multi-pulse exciting condition.And in the later experiments on induction cells with ferrite and amorphous cores under high voltage（more than 200 kV） triple-pulse excitation,consistent results have been derived.