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一、引 言 托卡马克等离子体中的阿尔芬波加热实验研究自80年代初以来取得了许多有价值的实验结果。在阿尔芬波加热实验中,天线辐射阻抗的测量是十分重要的。天线辐射阻抗的变化不仅直接反映了阿尔芬波与等离子体之间的能量耦合情况,而且也反映了波在等离子体中传播过程的某些物理特性。例如,出现离散阿尔芬波(DAW模)或表面静电波(SEW模)便会使阻抗出现较大的峰值。因此,探索一种简便易行又能反映阻抗随放电时间变化的细微
I. INTRODUCTION The experimental study of Alfenbo heating in tokamak plasma has made many valuable experimental results since the early 1980s. In the Alfenbo heating experiment, the measurement of the antenna’s radiation impedance is very important. The variation of the radiation impedance of the antenna not only directly reflects the energy coupling between the Alfven wave and the plasma, but also reflects some physical characteristics of the wave propagation in the plasma. For example, the appearance of discrete Alfven waves (DAW mode) or surface acoustic waves (SEW modes) causes a large peak in impedance. Therefore, to explore a simple and easy to reflect the impedance with the discharge time changes subtle