S波段相对论速调管放大器同轴输出腔的数值模拟

 介绍了S波段强流相对论速调管放大器（RKA）同轴输出腔内束波转换效率和腔主要参数的计算、微波提取的粒子模拟和优化以及实验。模拟计算时，采用单间隙的同轴输出腔，束压580 kV、束流4 kA的环行电子束，基波调制深度为80%，利用3维粒子程序得到约500 MW的微波输出功率，效率21.5%。将该模拟结果应用于实验的设计，实验中采用束压550 kV、束流4 kA的电子束得到功率500 MW、脉宽120 ns的输出微波，束波转换效率22.7%，实验结果与模拟结果吻合较好。

Numerical simulations of coaxial output cavity of S-band relativistic klystron amplifier

The calculation of coaxial output cavities, simulation of microwave extraction from a modulated intense relativistic electron beams,optimization on beams and output cavity geometry parameters,as well as the experiments of microwave extraction for an S-band long-pulse-intense-current relativistic klystron amplifier are described in this paper.Applying a three dimensional code,an output power of 500 MW is obtained.The efficiency is about 21.5%.In experiments,a hollow electron beam of 550 kV,4 kA generates an electron beam with modulated current of 3.2 kA after idler cavity gap.About 500 MW RF power is obtained.The efficiency is about 22.7%.The results of simulation agree well with the experimental results.