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Suppression of rotating external kink instabilities using optimized mode control feedback

机译:使用优化的模式控制反馈抑制旋转的外部扭结不稳定性

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Rotating external kink instabilities have been suppressed as well as excited in a tokamak using active magnetic coils that directly couple to the plasma through gaps in passive stabilizing conducting shells that surround the plasma. The kink instability has a complex growth rate, approximately (3 + i2 pi 5) X 10(3) s(-1), and is near the ideal wall stability limit when discharges are prepared with a rapid plasma current ramp and adjusted to have an edge safety factor near 3. The active control coils are driven by a digital mode control feedback system that uses multiple field-programmable gate arrays to analyze signals from 20 poloidal field sensors and achieve high-speed feedback control. The feedback coil geometry used was designed to optimize feedback effectiveness. Signal processing is of critical importance to optimize phase transfer functions for control of rotating modes. (c) 2005 American Institute of Physics.
机译:旋转的外部扭结不稳定性已被抑制,并且在托卡马克中使用了主动电磁线圈,该主动电磁线圈通过围绕等离子体的无源稳定导电壳中的间隙直接耦合到等离子体,从而激发了这种现象。弯折不稳定性具有复杂的增长率,大约为(3 + i2 pi 5)X 10(3)s(-1),并且在通过快速等离子电流斜坡制备放电并将其调整为具有边缘安全系数接近3。有源控制线圈由数字模式控制反馈系统驱动,该系统使用多个现场可编程门阵列分析来自20个多极场传感器的信号并实现高速反馈控制。设计使用的反馈线圈几何形状可优化反馈效果。信号处理对于优化相位传递函数以控制旋转模式至关重要。 (c)2005年美国物理研究所。

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