R&D of Transmission System for Millimeter CW High Power

本课题的研究目的是研制毫米波连续波大功率传输线系统。为了获得高性能的透射元件，我们在国际合作的帮助下进行了有效的研究，制作了屋顶型偏振器作为测试件，对其性能进行了实验和数值分析。正如预期的那样，偏振角随着偏振器中旋转角的两倍角旋转。注入到偏振器的功率具有少量的寄生模式。插入损耗为0.7db，是由于偏振器中反射镜的超模功率溢出引起的。计算结果与数值分析结果吻合较好。本文研究了用于先进回旋管的分裂波导与距离和直径的关系。本文的分析是基于电磁场的正交关系和辐射方向图的计算。用于ins 关于我们 在直径为101.6mm、频率为84 GHz、模为TE_（15，2）的情况下，次级波导与TE_（15，2）的耦合以1.85%/mm的速率减小，直到间隔为70 mm。为了优化波导的尺寸，次级波导的直径与发射波导的直径相同。除了分裂距离，由离轴的影响进行了讨论。这里，DC断路器由波纹波导组成。结果表明，在2.5cm的分束距离处，HE 11模占98.5%。当波导轴位移x=y= 2 mm时，传输率不变。为了在回旋管中使用高斯模式，分析了波导壁变形时的模式转换。编制了包含微分方程的数值计算程序。壁面具有复杂螺旋形状的变形有利于高斯光束的传输。为了在Luanching天线中实现椭圆高斯光束的传输，以及作为回旋管的窗口，研制了矩形波纹波导。色散关系、电磁场方向图、功率衰减的计算符合真实的要求。讨论了圆形波纹波导与方形波纹波导的耦合问题。耦合系数高达99%。少

The purpose of the research is to develop the transmission-line system of millimeter-wave CW high power. To achieve the transmission elements with high performance, the study is performed effectively with the aid of the international colaboration.The performance of roof-top type polarizer which is fabricated as a test peice is examined experimentally and numerically. As expected, the polarization angle rotates with the twice angles of the rotation angle in the polarizer. The injected power to the polarizer has a small contents of spurious mode. The insertion loss of 0.7db results from the spilled over power of the suprious mode in the reflected mirrors which is installed in the polarizer. The results is in good agreement with the numerical analysis.The splitt waveguide as a function of distance and diameter which is used to the advanced gyrotron is investigated. Here, the analysis is based on the orthogonal relation of electromagnetic field and calculation of radation patterns. For ins … More tance, in the diameter of 101.6 mm and frequency of 84 GHz and the mode of TE15,2, the coupling to the TE15,2 for secondary waveguide decreases with the rate of 1.85%/mm up to the separation of 70mm. For the optimum of the size in waveguide the same diameter for the secondary waveguide as the launching waveguide.The DC break as a splitt waveguide of the corrugated guide is analyzed. In addition to the splitt distance, an influence by the off-axis is discussed. Here, the DC break consists of the corrugated waveguide. The results show the 98.5% of HE11 mode at the 2.5 cm of splitt distance. When the axis of waveguide is displaced by x=y=2mm the transmission rate does not changed.The mode-convertor with the wall deformation is analyzed in order to use the convertor to gaussian mode in the gyrotron. The numerical code with including the differential equation is developed. The wall deformation with complex helical shapes is good for the gaussian convertor.The rectangular corrugated waveguide is developed for the purpose of the elliptical gaussian beam in the luanching anntenas and the window for gyrotron. The calculation of the dispersion relation, pattern of electromagnetic fields, attenuation of power is satisfactory for the real purpose. The coupling of circular corrugated waveguide to the square corrugated guide is discussed. The coupling coefficients is as high as 99%. Less