同轴引出相对论返波管

Relativistic backward-wave oscillator with coaxial extractor

提出一种新型相对论返波管同轴引出相对论返波管结构。首先 ,利用 KARAT软件对这种结构进行了 2 .5维全电磁粒子数值模拟 ,经过参数调整 ,输出的微波脉冲功率为 2 .0 GW,微波频率为 9.2 8GHz,转换效率达 4 5%。并在模拟中对电子束与电磁波的作用过程进行了跟踪和分析 ;然后利用 SUPERFISH软件对此结构中的场分布进行了计算 ,结合 PIC模拟结果 ,初步证明了由于内导体的引入改变了返波管末端的反射 ,有利于电子束与电磁波的能量交换。

This paper brings forth a new relativistic backward-wave oscillator with coaxial extractor. Numerical simulation is conducted using KARAT code. This simulation produces a microwave pulse power of 2.0 GW at 9.28 GHz for 730 kV, 6 kA injecting beam. Power transform efficiency of 45% is obtained. The interaction between beam and slow wave structure is tracked and analyzed. SUPERFISH code is used to calculate axial electric field distribution, and the results show that the relativistic backward-wave oscillator with coaxial extractor has the advantage of increasing efficiency.