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

Jeremy M. Hanson, Bryan De Bono, Royce W. James, Jeffrey P. Levesque, Michael E. Mauel, David A. Maurer, Gerald A. Navratil, Thomas Sunn Pedersen, Daisuke Shiraki

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12 Scopus citations

Abstract

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, Phys Plasmas 12, 040703 (2005)].

Original languageEnglish
Article number080704
JournalPhysics of Plasmas
Volume15
Issue number8
DOIs
StatePublished - 2008
Externally publishedYes

Funding

This work was supported by the U.S. Department of Energy Grant No. DE-FG02-86ER53222.

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