摘要
介绍利用20GW加速器二极管产生的电子束源,开展S波段相对论速调管振荡器(RKO)的理论设计、粒子模拟和实验研究的情况.该RKO采用3个紧密耦合的圆柱腔作为振荡腔,束流经过一段漂移管的群聚后采用三轴输出腔提取微波.该振荡器具有起振时间快、结构紧凑、束波转换效率较高等优点.采用无箔空心阴极和0.9T的恒流源磁场引出的电压1MV、束流13kA、脉宽40ns的环形电子束驱动RKO,单次运行输出了3.5GW的辐射微波功率,效率27%,频率2.86GHz,瞬时带宽2%;脉冲重复频率20Hz运行时,输出微波功率3.4GW.实验结果与粒子模拟结果符合得较好.
The physics of modulation and rf extraction of an S-band relativistic klystron oscillator is studied in this paper via experiment, theory, and simulation. It is found that the intense relativistic electron beams （IREBs） can be intensely currentmodulated when the IREBs drift through three pillboxes with high coupling. After bunching in the downstream the modulated IREBs can excite high-power microwave in the triaxial cavity. These properties, which have short oscillating time, compact geometry and high beam-wave conversion efficiency, were encouraging. Using a 1 MV, 13 kA, 40 ns electron beam and a 0.9 kGs leading magnetic field, 3.5 GW radiated power was extracted in 20 ns FWHM pulses at 2.86 GHz. The efficiency was 27 %, and the instantaneous bandwidth was 2 %. The radiated power was 3.4 GW when the repetition rate IREBs was 20 Hz. The experimental results agree well with the simulations.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第3期1765-1770,共6页
Acta Physica Sinica
关键词
相对论速调管
振荡器
三轴提取腔
高功率微波
S波段
relativistic klystron, oscillator, triaxial output cavity, high power microwave
