同轴回旋行波放大器的理论和数值研究
Researches on coaxial gyrotravellingwavetube amplifier
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摘要: 给出了一组描述同轴回旋行波放大器中波束相互作用的非线性自洽方程组，对该放大器的运行特性进行了研究。得到：在小信号区，辐射场的增益随同轴波导的内外半径比b/a的增加而增加，达到饱和时的辐射功率仅略有下降；内外导体管壁上的功率损耗密度随b/a的增加而减小。采用电压为90kV，电流为10A，纵向速度零散度为3%，速率比为1的电子束，在34.26～36.78GHz的频率范围内，计算得到了峰值功率约230kW的微波输出，相应的增益和效率分别为46.6dB和25.5%，带宽为7%，内外导体管壁上功率的最大损耗分别为80和56W/cm2。Abstract: A set of selfconsistent nonlinear equations in the electron guiding center coordinate is derived for the study of the behavior of the coaxial Gyrotravellingwavetube(GyroTWT) amplifier. Calculations show that: the input signal grows faster and gets saturated earlier at a slightly lower radiation power with the increasing of the ratio of the inner to outer radius; power loss on the walls of the inner and outer conductor decrease with the increasing of the ratio. Using an electron beam of 90kV, 10A and velocity ratio of 1.0 with 3% axial velocity spread, 230kW peak output power is obtained by calculation at the frequency range of 34.26 to 36.78GHz, the gain, efficiency and bandwidth are 46.6dB, 25.5% and 7.0%, respectively. The maximum loss on the walls of the coaxial waveguide are
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