Abstract:

The liquid triple-stub tuner was adopted to obtain the impedance matching for antenna load of ion cyclotron resonance heating. Under the condition of impedance matching, the frequency modulation technique was used to reduce the reflected power caused by the change of antenna loading. The relationship between reflection coefficient and antenna loading before and after frequency modulation was numerically simulated to everify the effect of frequency modulation on ICRH system impedance matching device. The numerical simulation results show that the liquid triple-stub tuner combine with frequency modulation technique can better reduce the reflection coefficient of transmission system and make the RF power transit antenna radiation coupled to plasma more effectively.

Key words: Liquid triple-stub tuner, Frequency modulation, Reflection coefficient

摘要：

采用三支节液态调配器使离子回旋加热(ICRH)天线系统达到阻抗匹配，在阻抗匹配的条件下结合频率调制技术来减小由天线输入阻抗变化所引起的反射功率。数值模拟了频率调制前后天线负载与反射系数的变化关系，用来验证频率调制对ICRH 天线中阻抗匹配装置的影响。模拟结果表明：三支节液态调配器结合频率调制方法，能更好地降低天线传输系统的反射系数，使得发射机的功率通过天线辐射更加有效地耦合到等离子体中去。

关键词: 三支节液态调配器, 频率调制, 反射系数