Abstract: The circuit simulation model of the magnetic probe in NI Multisim is used to obtain the frequency response characteristics of the magnetic probe for Thailand Tokamak 1 (TT-1). It is found that the distributed capacitance mainly affects the resonant frequency of the magnetic probe, while the circuit inductance has some influence on the resonant frequency and resonant peak value of the magnetic probe. Based on the Helmholtz coils, the frequency response calibration experiment of the probe is carried out, and the results show that the frequency response of the small probe is in good agreement with the simulation result. Furthermore, the influence of the probe transmission cable on the frequency response is analyzed through experimental and numerical studies. Finally, the frequency response parameters of the TT-1 probe are determined, which provide an important reference for the design of the probe size and the selection of signal transmission cable.

Key words: Simulation model, Magnetic probe, Frequency response calibration, Transmission cable

摘要： 利用NI Multisim仿真设计软件对泰国托卡马克1号(TT-1)磁探针的电路仿真模型进行测试，得出了探针的频响特性，其中分布电容主要影响磁探针的谐振频率大小，回路电感对磁探针的谐振频率和谐振峰值均有一定影响。基于亥姆霍兹线圈，进行了探针频响标定实验，结果显示磁探针的频率响应和仿真结果具有较好的一致性。通过实验和数值方法，分析了探针传输线缆长度对探针幅频响应的影响。确定了TT-1装置探针的频响参数，为探针尺寸的设计以及信号传输线缆的选择提供了重要的参考依据。

关键词: 仿真模型, 磁探针, 频响标定, 传输线