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介绍了S波段强流相对论速调管放大器(RKA)双间隙输出腔高频系统的设计,并利用3维粒子模拟程序模拟和优化了短脉冲强流相对论调制电子束经过双间隙输出腔后的微波提取。在束压640 kV、束流6 kA、基波调制深度80%的条件下,模拟得到功率为1.1 GW的微波,频率约为2.85 GHz,效率28%。在高频分析和粒子模拟的基础上进行了实验研究,实验中采用束压640 kV、束流6 kA的环行电子束,经过优化调节RKA参数,在中间腔后得到了约4.6 kA的基波调制电流,加上双间隙提取腔后从该RKA获得了频率为2.9 GHz、功率为1 GW、脉宽22 ns的输出微波,束波转换效率26%。
The design of S-band RRS double-gap output cavity high-frequency system is introduced. The 3-D particle simulation program is used to simulate and optimize the short pulse intense current relativistic modulation electron beam passing through the double gap output cavity Microwave extraction. Under the conditions of 640 kV beam, 6 kA beam and 80% modulation depth, a microwave of 1.1 GW was obtained. The frequency was about 2.85 GHz and the efficiency was 28%. Based on the high-frequency analysis and the particle simulation, an experimental study was carried out. The electron beam with a beam pressure of 640 kV and a beam current of 6 kA was used in the experiment. The RKA parameters were optimized and adjusted to obtain a fundamental wave of about 4.6 kA The modulation current, combined with the double-gap extraction chamber, obtained output microwaves with a frequency of 2.9 GHz, a power of 1 GW and a pulse width of 22 ns from the RKA, with a beam conversion efficiency of 26%.