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Feedback suppression of rotating external kink instabilities in the presence of noise

Phys. Plasmas 15, 080704 (2008); doi:10.1063/1.2974797

Published 29 August 2008

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Jeremy M. Hanson, Bryan De Bono, Royce W. James, Jeffrey P. Levesque, Michael E. Mauel, David A. Maurer, Gerald A. Navratil, Thomas Sunn Pedersen, and Daisuke Shiraki
Applied Physics and Applied Mathematics, Columbia University, 200 S. W. Mudd Building - MC 4701, 500 W. 120th Street, New York, New York 10027, USA
The authors report on the first experimental demonstration of active feedback suppression of rotating external kink modes near the ideal wall limit in a tokamak using Kalman filtering to discriminate the n=1 kink mode from background noise. The Kalman filter contains an internal model that captures the dynamics of a rotating, growing n=1 mode. Suppression of the external kink mode is demonstrated over a broad range of phase angles between the sensed mode and applied control field, and performance is robust at noise levels that render proportional gain feedback ineffective. Suppression of the kink mode is accomplished without excitation of higher frequencies as was observed in previous experiments using lead-lag loop compensation [A. J. Klein et al., Phys Plasmas 12, 040703 (2005)]. ©2008 American Institute of Physics
History: Received 10 June 2008; accepted 30 July 2008; published 29 August 2008
Permalink: http://link.aip.org/link/?PHPAEN/15/080704/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Py
    Plasma macroinstabilities (hydromagnetic)
  • 52.35.Fp
    Plasma electrostatic waves and oscillations
  • 52.55.Fa
    Tokamaks
  • YEAR: 2008

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ISSN:
1070-664X (print)   1089-7674 (online)
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