We have developed a parametric method for eliminating the background component of the plasma current, which is measured by a Rogowski coil and polluted by the toroidal magnetic field in the vacuum vessel of the Keda Torus eXperiment (KTX) reversed field pinch (RFP) device. The method considers the toroidal magnetic field windings, the KTX vacuum chamber, and the Rogowski coil as a linear time-invariant system; in this case, a constant frequency response function characterizes the system. Using this response function, the current component caused by pollution from the toroidal magnetic field can be predicted exactly for an arbitrary input current to the toroidal magnetic field windings. Compared with the traditional proportional compensation method, the proposed method has great flexibility and universality and it is potentially applicable to cases in which the toroidal field current signal changes over time with plasma feedback signals. Furthermore, the method can be applied to other similarly affected signals, such as magnetic field signals. As an example, we have corrected the poloidal and toroidal magnetic field signals better to reveal the true physical processes for the RFP state.

中文翻译：

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一种校正污染等离子体电流信号的参数化方法及其在科达圆环实验中的应用

我们开发了一种用于消除等离子体电流背景分量的参数方法，该方法由 Rogowski 线圈测量并被 Keda Torus eXperiment (KTX) 反向场收缩 (RFP) 设备的真空容器中的环形磁场污染。该方法将环形磁场绕组、KTX真空室和Rogowski线圈视为线性时不变系统；在这种情况下，恒定频率响应函数表征了系统。使用该响应函数，可以针对环形磁场绕组的任意输入电流准确预测由环形磁场污染引起的电流分量。与传统的比例补偿方式相比，所提出的方法具有很大的灵活性和通用性，它可能适用于环形场电流信号随等离子体反馈信号随时间变化的情况。此外，该方法可以应用于其他类似受影响的信号，例如磁场信号。例如，我们更好地校正了极向和环形磁场信号，以揭示 RFP 状态的真实物理过程。