Suppression of rotating external kink instabilities using optimized mode control feedback

被引：21

作者：

Klein, AJ ^{[1
]}

Maurer, DA ^{[1
]}

Pedersen, TS ^{[1
]}

Mauel, ME ^{[1
]}

Navratil, GA ^{[1
]}

Cates, C ^{[1
]}

Shilov, M ^{[1
]}

Liu, Y ^{[1
]}

Stillits, N ^{[1
]}

Bialek, J ^{[1
]}

机构：

[1] Columbia Univ, Plasma Phys Lab, New York, NY 10027 USA

来源：

PHYSICS OF PLASMAS | 2005年 / 12卷 / 04期

关键词：

D O I：

10.1063/1.1868732

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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.

引用

页码：1 / 4

页数：4

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