阶梯阴极型L波段MILO的实验研究

 对阶梯阴极型L波段磁绝缘线振荡器（MILO）进行了实验研究。介绍了测试方法与测试系统；开展了阴极电子发射实验，发现阴极电子发射不均匀是对称结构MILO产生非对称微波模式的最关键的因素之一；并对二极管屏蔽环尺寸、扼流片半径、提取间隙等进行了研究。在电子束电压约420 kV、电流33 kA的条件下，得到了阶梯阴极型L波段MILO的高功率微波辐射功率为1.22~1.47 GW，脉宽大于20 ns，频率为1.21 GHz，束波转换效率约为10%，器件产生微波模式为TM01模，经过模式转换器后的辐射模式为TE11模。

Experimental researches on ladder cathode L-band MILO

A ladder cathode L-band MILO is experimentally investigated.The measurement methods and measurement system are introduced.The proper cathode material is selected and the cathode emission of electrons is investigated,then one of the key factors is obtained,which results in an asymmetric microwave mode generated by symmetric MILO.Additionally,other factors are also investigated,which can affect the output microwave power such as the dimension of the diode shelter,the diameter of the choke vanes,the extraction gap,and so on.After experimental investigation,employing an electron beam of about 420 kV and 33 kA,ladder cathode L-band MILO generates 1.22~1.47 GW of high power microwave with over 20 ns of pulse duration at 1.21 GHz.The conversion efficiency between electrons and microwave is about 10%.The generated microwave mode is TM01 and resorting to mode converter,the radiation microwave mode is TE11.