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研究了一种用于高功率回旋振荡管准光模式变换系统的高效率Denisov型辐射器.基于Bessel函数的积分展开及几何光学理论,系统地分析了圆波导中电磁波的传播过程及Denisov型辐射器降低衍射损耗的机理;分析了在圆波导内壁上工作模式与耦合模式叠加形成准高斯型场分布的过程.从Bessel函数导数的本征值出发,给出了不同工作模式在Denisov型辐射器预聚束波导段选择目标耦合模式的一种普适方法,同时给出了Denisov型辐射器的设计方法.依据上述理论分析编写了计算程序,并对一支140 GHz,工作模式为TE28,8,1 MW长脉冲回旋振荡管进行了对比验证,计算结果与文献报道的结果具有很好的一致性.
A high efficiency Denisov radiator for a high power gyroscope tube quasi-light mode conversion system is studied.Based on the integral expansion of the Bessel function and the theory of geometrical optics, the electromagnetic wave propagation in the circular waveguide and the Denisov radiation The mechanism of reducing the diffraction loss is analyzed.The process of superposition of the working mode and the coupling mode on the inner wall of the circular waveguide to form the quasi-Gaussian field distribution is analyzed.According to the eigenvalues of the Bessel function derivative, different working modes are given in the Denisov radiator A universal method to select the target coupling mode of the pre-beam segment and the design method of the Denisov radiator are given.According to the theoretical analysis above, a calculation program is prepared and a 140 GHz, TE28, , 1 MW long pulse gyrotron oscillating tube were compared and verified. The calculated results are in good agreement with those reported in the literature.