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in subjects: "Plasma Macroinstabilities"  
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Stabilization of global MHD instabilities by toroidal plasma rotation

Description: Theoretical study and experimental observations suggest that rotation can play a crucial role in determining plasma stability. Since conventional magnetohydrodynamic (MHD) analysis ignores rotation, more advanced computational tools are being developed to confirm the theoretical understanding and to perform comparison between theory and experiment. In a previous work, the authors reported on the formulation and computation of MHD modes in plasmas with a small (subsonic) toroidal rotation. R.ota… more
Date: July 1, 1995
Creator: Chu, M. S.; Miller, R. L.; Bondeson, A.; Luetjens, H.; DeRidder, G. & Sauter, O.
Partner: UNT Libraries Government Documents Department
open access

Study of the resistive wall mode in DIII-D

Description: Recent MHD calculations predict that, for a plasma with sufficient rotation, a resistive wall can provide stability up to the {beta}{sub N} limit predicted assuming the wall were ideal. In the region of {beta}{sub N} between the wall-at-infinity limit and the ideal-wall limit, an MHD instability branches into two modes: a plasma mode, that is nearly stationary with respect to the plasma at the resonant surface, and a resistive wall mode (RWM), that is nearly stationary with respect to the wall.… more
Date: July 1998
Creator: Garofalo, A. M.; Bialek, J. & Chu, M. S.
Partner: UNT Libraries Government Documents Department
open access

Production and stability of high-beta DIII-D discharges with reversed magnetic shear

Description: Plasma configurations with reversed magnetic shear have been proposed for steady-state tokamak operation since the plasma profiles can be made consistent with good confinement, high bootstrap current fraction, and stability at very high beta. The stability of reversed magnetic shear discharges with beta up to 11% has previously been demonstrated in DIII-D. Reversed magnetic shear (RMS) refers to a safety factor profile, q({rho}), which is a non-monotonic function of minor radius, {rho}. The mag… more
Date: July 1, 1995
Creator: Mauel, M. E.; Rice, B. W. & Strait, E. J.
Partner: UNT Libraries Government Documents Department
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