Theoretical modelling of the feedback stabilization of external MHD modes in toroidal geometry

A theoretical framework for understanding the feedback mechanism for stabilization of external MHD modes has been formulated. Efficient computational tools-the GATO stability code coupled with a substantially modified VACUUM code-have been developed to effectively design viable feedback systems agai...

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Bibliographic Details
Published in:Nuclear fusion 2002-03, Vol.42 (3), p.295-300
Main Authors: Chance, M.S, Chu, M.S, Okabayashi, M, Turnbull, A.D
Format: Article
Language:English
Subjects:
Calculations
Computer simulation
Electric currents
Exact sciences and technology
Magnetic confinement and equilibrium
Magnetic properties
Magnetohydrodynamic waves
Magnetohydrodynamic waves (e.g., alfven waves)
Magnetohydrodynamics
Mathematical models
Optimization
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Pressure
Stellarators, spheromaks, compact tori, bumpy tori, and other toroidal confinement devices
Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices
Waves, oscillations, and instabilities in plasmas and intense beams
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Summary:A theoretical framework for understanding the feedback mechanism for stabilization of external MHD modes has been formulated. Efficient computational tools-the GATO stability code coupled with a substantially modified VACUUM code-have been developed to effectively design viable feedback systems against these modes. The analysis assumed a thin resistive shell and a feedback coil structure accurately modelled in theta and o, albeit with only a single harmonic variation in o. Time constants and induced currents in the enclosing resistive shell are calculated. An optimized configuration based on an idealized model has been computed for the DIII-D device. Up to 90% of the effectiveness of an ideal wall can be achieved.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/42/3/310