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Active control of multiple resistive wall modes

机译：主动控制多种电阻墙模式

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A two-dimensional array of saddle coils at M-c poloidal and N-c toroidal positions is used on the EXTRAP T2R reversed-field pinch (Brunsell P R et al 2001 Plasma Phys. Control. Fusion 43 1457) to study active control of resistive wall modes (RWMs). Spontaneous growth of several RWMs with poloidal mode number m = 1 and different toroidal mode number n is observed experimentally, in agreement with linear MHD modelling. The measured plasma response to a controlled coil field and the plasma response computed using the linear circular cylinder MHD model are in quantitive agreement. Feedback control introduces a linear coupling of modes with toroidal mode numbers n, n' that fulfil the condition vertical bar n - n'vertical bar = N-c. Pairs of coupled unstable RWMs are present in feedback experiments with an array of Mc x Nc = 4 x 16 coils. Using intelligent shell feedback, the coupled modes are generally not controlled even though the field is suppressed at the active coils. A better suppression of coupled modes may be achieved in the case of rotating modes by using the mode control feedback scheme with individually set complex gains. In feedback with a larger array of Mc x Nc = 4 x 32 coils, the coupling effect largely disappears, and with this array, the main internal RWMs n = -11, -10, +5, +6 are all simultaneously suppressed throughout the discharge (7-8 wall times). With feedback there is a two-fold extension of the pulse length, compared to discharges without feedback.
机译：在EXTRAP T2R反向场夹点（Brunsell PR et al 2001 Plasma Phys.Control.Fusion 43 1457）上使用二维阵列的鞍形线圈在Mc极点和Nc环形位置上进行研究，以研究电阻壁模式（RWMs）的主动控制）。与线性MHD建模相一致，通过实验观察到了几种倍数模式数m = 1和不同环形模式数n的RWM的自发生长。测得的对受控线圈场的等离子体响应与使用线性圆柱体MHD模型计算的等离子体响应在数量上一致。反馈控制引入了具有满足以下条件的环形模式的线性耦合：环形模式编号n，n'，垂直条n-n'垂直条= N-c。在反馈实验中，成对的耦合不稳定RWM对具有Mc x Nc = 4 x 16线圈阵列。使用智能外壳反馈，即使在有源线圈处抑制了磁场，通常也不会控制耦合模式。通过使用具有单独设置的复数增益的模式控制反馈方案，可以在旋转模式的情况下更好地抑制耦合模式。在较大的Mc x Nc = 4 x 32线圈阵列的反馈中，耦合效应大大消失，并且通过该阵列，主要内部RWM n = -11，-10，+ 5，+ 6在整个过程中都被同时抑制。放电（7-8壁次）。与没有反馈的放电相比，有了反馈，脉冲长度延长了两倍。

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