双脉冲电子直线感应加速器实验研究

Experimental research of double-pulse linear induction electron accelerator

Mini-LIA为MHz重复频率双脉冲电子直线感应加速器,由双脉冲功率系统、热阴极电子枪注入器及金属玻璃磁芯感应加速腔等组成。在此平台的实验获得了数百ns间隔(即MHz重复频率)的双脉冲高压,每个脉冲幅值达到80kV,脉冲半高全宽为80ns;在感应腔加速间隙处测得双脉冲加速电场;在加速器出口处测量得到流强约1.1A的双脉冲电子束流。实验结果表明:利用硅堆隔离汇流装置可实现MHz重复频率的双脉冲高压,金属玻璃磁芯感应加速腔和六硼化镧热阴极电子枪均适合MHz重复频率双脉冲工作方式。

The Mini-LIA is a double-pulse linear induction electron accelerator with megahertz repetition rates, which consists of a double-pulse power system, a thermal cathode electron gun, two induction cells, beam transportation systems and diagnosis systems, etc. Experiments of the Mini-LIA have been conducted. The double-pulse high voltage was obtained with several hundred nanosecond pulse intervals （i. e. megahertz repetition rate） and each pulse had an 80 kV amplitude with a FWHM of 80 ns. In the gap of the induction cell, the double-pulse accelerating electric field was measured via E-field probes, and the double- pulse electron beam with a current about 1. 1 A has been obtained at the Mini-LIA exit. These experimental results show that the double pulse high voltage with megahertz repetition rates can be generated by an insulation and junction system. And they also in dicate that the induction cell with metglas as the ferromagnetic material and the LaB6 thermal cathode electron gun suit the double pulse operation with megahertz repetition rates.