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利用远红外激光干涉仪对Tokamak内部电子数密度和磁场分布进行测量是控制其放电状态的重要依据。从该方法的测量原理出发,分析了中频信号频率不稳定性对电子数密度和磁场分布测量以及Tokamak放电状态实时控制的影响;针对如何提高中频频率的稳定性提出了一套以单片机为核心的控制方案和控制系统,并研制了稳频控制器;通过现场调试,对比分析了控制前后中频信号的频率变化。实验结果表明,未接入稳频控制器时,30 min内中频频率中心值变化了90 k Hz;而接入稳频控制器后,中频频率中心值始终在设定值的±5 k Hz范围内变化。这表明该控制方法和控制系统能够实现中频频率的稳定控制。
Measurement of the electron density and magnetic field inside the Tokamak by using a far-infrared laser interferometer is an important basis for controlling the discharge state. Based on the measurement principle of the method, the influence of the frequency instability of the intermediate frequency signal on the measurement of the electron density and magnetic field distribution and the real-time control of the Tokamak discharge state is analyzed. Aiming at how to improve the stability of the intermediate frequency, a set of monolithic integrated circuit Control scheme and control system, and developed a frequency stabilization controller. Through on-site commissioning, the frequency changes of IF signal before and after control were analyzed. The experimental results show that when the controller is not connected, the mid-frequency center value changes by 90 kHz within 30 min. When the controller is connected, the mid-frequency center value is always within ± 5 k Hz of the set value Within the change. This shows that the control method and control system can achieve stable control of IF frequency.