感性加载宽间隙腔相对论速调管的粒子模拟
Particle simulation of S-band inductively-loaded wide-gap cavity relativistic klystron amplifier
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摘要: 通过粒子模拟的方法研究了三腔结构的感性加载宽间隙腔相对论速调管放大器,分析了宽间隙腔中垫圈/杆等参数对于束流调制的影响。模拟结果表明:感性加载的宽间隙腔能够克服宽腔所带来的势垒效应，增加电子束与腔的作用时间，提高束流调制和能量提取的效率。模拟中采用500 keV，6 kA的电子束，经过两腔调制得到了约4.5 kA的调制电流，调制深度接近80%；采用渐变结构的输出腔，得到功率约1.2 GW，频率2.86 GHz，效率为40%的输出微波。Abstract: With the 2.5D full electromagnetic particle-in-cell code, an S-band inductively-loaded wide-gap cavity relativistic klystron amplifier is proposed and investigated. The effects of the washers/rods parameters on intense relativistic electron beam modulation are given. Simulation results show that wide-gap cavity can extend beam/cavity interacting duration and increase the efficiency. The increase in potential energy of wide gap can be prevented by the washers/rods return current structure. Making use of a 500 keV, 6 kA electron beam, about 4.5 kA modulation current and a microwave with power of 1.2 GW and efficiency of 40% are obtained.
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