Motivated by the recent experimental observation that plasma stability can be improved by external magnetic perturbations, the general problem of plasma response to external magnetic perturbations is investigated. Different (vacuum, ideal and resistive) plasma response models are considered and compared. Plasma response, in experiments where stabilization was achieved, is obtained through computation using the MARS-F code, with a plasma model that includes both plasma resistivity and rotation. The resultant magnetic field line stochasticity is much reduced from that obtained formerly using the vacuum plasma model. This reduced stochasticity is more consistent with the favourable experimental observation of enhanced stability. Examples are given for the response of an ITER plasma to perturbations generated by the correction coils; and the response of a plasma to external coils (antenna) up to the Alfvén frequency.
受近期实验观测的启发，即外部磁扰动能够改善等离子体稳定性，本文研究了等离子体对外部磁扰动的响应这一普遍问题。考虑了不同的（理想、电阻）等离子体响应模型，并对其进行了比较。在实现了稳定化的实验中，利用MARS-F代码，采用包含等离子体电阻率和转动的等离子体模型，通过计算获得了等离子体响应。由此得到的磁场随机性相较于先前使用真空等离子体模型所得结果显著降低。这种降低后的随机性与实验中观测到的有利稳定性改善更为一致。文中给出了ITER等离子体对校正线圈产生扰动的响应示例，以及等离子体对频率直至阿尔芬频率的外部线圈（天线）扰动的响应示例。