R&D of Transmission System for Millimeter CW High Power

本课题的研究目的是开发毫米波连续大功率的在线传输系统。为了实现高性能的传动元件，在国际合作的帮助下，有效地进行了研究。对作为试验件制作的顶盖式偏振片的性能进行了实验和数值分析。正如预期的那样，偏振角随偏振镜中旋转角度的两倍角度旋转。注入偏振器的功率中杂散模的含量很小。插入损耗为0.7db，这是由于安装在偏振镜中的反射镜的超模功率溢出造成的。计算结果与数值分析结果吻合较好。研究了用于先进回旋管的劈裂波导与距离和直径的函数关系。在这里，分析是基于电磁场的正交关系和辐射方向图的计算。在直径为101.6 mm、频率为84 GHz、模式为te152,70 mm时，二次波导与te152,70 mm的耦合减小幅度为1.85%/mm。为了优化波导的尺寸，二次波导的直径应与发射波导的直径相同。分析了波纹波导作为劈裂波导时的直流断路。除分离距离外，还讨论了离轴的影响。这里，直流断路由波纹波导组成。结果表明，在2.5 cm的劈裂距离下，HE11模式的效率为98.5%。当波导轴线偏移x=y=2mm时，传输速率不变。为了在回旋管中实现高斯模式的转换，对具有壁变形的模式转换器进行了分析。给出了包含微分方程的数值程序。具有复杂螺旋形状的壁面变形对高斯变换器是有利的。针对发射天线中的椭圆高斯光束和回旋管的窗口，研制了矩形波纹波导。对色散关系、电磁场方向图、功率衰减的计算符合实际目的。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