Measurement of the resistive-wall-mode stability in a rotating plasma using active MHD spectroscopy

The stability of the resistive-wall mode (RWM) in DIII-D plasmas above the conventional pressure limit, where toroidal plasma rotation in the order of a few percent of the Alfve n velocity is sufficient to stabilize the n=1 RWM, has been probed using the technique of active MHD spectroscopy at frequ...

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Bibliographic Details
Published in:Physical review letters 2004-09, Vol.93 (13), p.135002.1-135002.4, Article 135002
Main Authors: REIMERDES, H, CHU, M. S, GAROFALO, A. M, JACKSON, G. L, HAYE, R. J, NAVRATIL, G. A, OKABAYASHI, M, SCOVILLE, J. T, STRAIT, E. J
Format: Article
Language:English
Subjects:
Electric and magnetic measurements
Exact sciences and technology
Magnetic confinement and equilibrium
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma diagnostic techniques and instrumentation
Tokamaks
Waves, oscillations, and instabilities in plasmas and intense beams
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Summary:The stability of the resistive-wall mode (RWM) in DIII-D plasmas above the conventional pressure limit, where toroidal plasma rotation in the order of a few percent of the Alfve n velocity is sufficient to stabilize the n=1 RWM, has been probed using the technique of active MHD spectroscopy at frequencies of a few Hertz. The measured frequency spectrum of the plasma response to externally applied rotating resonant magnetic fields is well described by a single-mode approach and provides an absolute measurement of the damping rate and the natural mode rotation frequency of the stable RWM.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.93.135002