提出了一种向内发射磁绝缘振荡器,并给出了微波轴向提取的方法。这种新型结构通过外置阴极、内置阳极,使参与束波作用的轮辐电流通过阳极回流提供了自磁绝缘的角向磁场,有提高器件效率的可能。而外置阴极使阴极的发射面积增大,发射电流密度减小,有利于延长阴极寿命。通过粒子模拟,得到了几何参数与磁绝缘线振荡器输出功率的关系。在电压890 kV,电流56.1 kA下,输出功率为3.6 GW,频率为8.2 GHz。

An inward emitting magnetically insulated transmission line oscillator(MILO) is presented and a method to axially extract microwave is assumed. The inward-emitting MILO has an novel design of structure with outer cathode and inner anode,which can recycle spoke current to provide self-insulating angular magnetic field,thus to improve the tube’s efficiency. The outer cathode has expanded emitting area,and the current density can be reduced correspondingly for a long cathode life. PIC simulation reveals the relationship between the MILO’s structure parameters and its output power. When the electron beam voltage is 890 kV and beam current is about 56.1 kA,microwave output of 3.6 GW is obtained with frequency of 8.2 GHz.