Abstract:

The intensity distribution, measured by IR camera at three different positions along the propagation routine, is used to calculate the first and second order moments of the radiation patterns and to retrieve the phase information, and then the propagation direction of the microwave along the waveguide can be determined. The alignment of two ECRH subsystems has been analyzed by using this method and the results show that the power distribution of two subsystems is Gaussian, the tilt angle of No.3 transmission line (7m) is about 0.05° and No.4 (6m) is about 0.14°.

Key words: ECRH, Alignment of transmission line, Power distribution, Moment theory, Phase reconstruction

摘要：

利用红外热像仪测量微波传播路径上的三个不同距离截平面上的微波强度分布，计算出辐射图的一阶及二阶矩并重建相位信息，可以确定微波波束的强度分布和准直度。使用该方法对两套ECRH系统传输线进行了定量的分析，获得了微波强度分布均为高斯分布、7m 3^#传输线的微波束线准直度为0.05°、6m 4^#传输线微波束线准直度为0.14°的结果。

关键词: ECRH, 传输线准直, 微波强度分布, 矩理论, 相位重建