R&D of Transmission System for Millimeter CW High Power

本研究的目的是研制毫米波高功率连续波传输线系统。为了获得高性能的传输元件，借助于国际上的合作，有效地进行了研究。对制作的屋顶式偏振器进行了实验和数值测试。不出所料，偏振角随着偏振器中旋转角的两倍而旋转。注入到偏振器的功率中含有少量的杂散模式。0.7db的插入损耗是由于安装在偏振器中的反射镜中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分裂波导随距离和直径的变化规律。在这里，分析是基于电磁场的正交关系和雷达方向图的计算。对于INS…在直径为101.6 mm、频率为84 GHz、模式为TE15，2的情况下，二次波导与TE15，2的耦合在间隔70 mm时以1.85%/mm的速度减小。为了得到最佳的波导尺寸，二次波导的直径与发射波导的直径相同。分析了波纹波导作为裂隙波导时的直流断裂问题。除了Splitt距离外，还讨论了离轴的影响。在这里，DC断路器由波纹波导组成。结果表明，在分裂距离为2.5 cm时，HE11模的效率为98.5%。当波导轴偏移x=y=2 mm时，传输速率保持不变。为了将其用于回旋管中的高斯模，对考虑壁面变形的模式转换器进行了分析。编制了包含微分方程组的数值计算程序。复杂螺旋线形状的壁面变形对高斯转换器是有利的，为了实现回旋加速器中椭圆高斯光束的传输，研制了矩形波纹波导。对色散关系、电磁场分布、功率衰减进行了计算，结果令人满意。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%。较少

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