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Suppression of MHD Modes with Active Phase-Control of Probe-Injected Currents

Nuclear Fusion(2021)SCI 1区

Columbia Univ

Cited 2|Views27
Abstract
Active phase-control of probe-injected current is shown to both suppress and amplify long-wavelength rotating magnetohydrodynamic instabilities in the HBT-EP tokamak. Four probes are connected in quadrature and energized to drive non-axisymmetric currents through the edge of the tokamak, creating magnetic perturbations comparable to previously-studied saturated kink modes or resonant magnetic perturbations that are generated by an external control coil array. Measurements of the magnetic perturbations from the probe-injected currents determine a set of current-carrying helical filaments used to model active feedback control of resistive wall modes. These experiments suggest current-injection feedback may be an effective alternative to external control coils for control of RWMs and other long-wavelength kink-like modes at the edge of tokamaks.
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Key words
tokamak,active control,biased electrodes,VALEN,MHD mode suppression,non-axisymmetric currents,scrape-off-layer
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要点】:该论文展示了通过主动相位控制注入电流可以抑制和放大托卡马克边缘的长波长旋转磁流体动力不稳定性。

方法】:采用四根探针以四分之一相位连接并激励,通过托卡马克边缘驱动非轴对称电流,产生与之前研究过的饱和扭曲模式或由外部控制线圈阵列产生的共振磁扰动相当的磁干扰。

实验】:通过测量探针注入电流的磁干扰,确定了一组携带电流的螺旋线缆,用于模拟对电阻壁模式的主动反馈控制。实验在HBT-EP托卡马克中进行,数据集名称未提及,结果表明电流注入反馈可能是有效替代外部控制线圈,用于控制托卡马克边缘的RWM和其他长波长扭曲模式。