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提出了一种托卡马克破裂先兆的动力学稳定方法,即将一个可控的感生交变电流加在平衡电流上。所施加的交变电流可以是具有适当频率的正弦电流,或是具有一个适当脉冲宽度τ的脉冲电流,或是一个不连续的脉冲电流(它的宽度τ远小于脉冲间隔),或是一个锯齿脉冲电流(它的上升时间远小于下降时间,其比值甚至可能≤10~(-3))。对交变电流驱动的物理模型作了详细的分析。关于交变电流对MHD扰动的抑制作用,从理论上作了分析并从数值上加以证明。结果表明,交变电流能使不连续导数Δ′对稳定撕裂模更有利。所以,只要适当地选取所施加的交变电流的各种参数,就可以有效地抑制MHD扰动,使扰动处在零增长状态,等离子体电流和温度分布保持在初始状态下基本不变,托卡马克处在稳定运行状态。
A dynamic stabilization method for tokamak rupture precursors is proposed, in which a controlled induced alternating current is added to the balance current. The alternating current applied may be a sinusoidal current with a suitable frequency, or a pulsed current with a suitable pulse width τ, or a discontinuous pulsed current (whose width τ is much smaller than the pulse interval) or a sawtooth Pulse current (its rise time is far less than the fall time, the ratio may even ≤ 10 ~ (-3)). The physical model driven by alternating current is analyzed in detail. The inhibitory effect of alternating current on the disturbance of MHD has been theoretically analyzed and proved numerically. The results show that the alternating current makes the discontinuous derivative Δ ’more stable for the tearing mode. Therefore, as long as the various parameters of the applied alternating current are properly selected, the MHD perturbation can be effectively suppressed so that the disturbance is in a zero-growth state, the plasma current and the temperature distribution remain basically unchanged in the initial state, and the tokamak In a stable state of operation.