Thumbnail
Access Restriction
Open

Author Popov, A. M. ♦ Chan, V. S. ♦ Chu, M. S. ♦ Liu, Y. Q. ♦ Rice, B. W. ♦ Turnbull, A. D.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CURRENT DENSITY ♦ DOUBLET-3 DEVICE ♦ INSTABILITY ♦ MAGNETOHYDRODYNAMICS ♦ PLASMA ♦ ROTATION ♦ SATURATION ♦ SHEAR ♦ TRANSPORT ♦ VISCOSITY
Abstract Nonlinear simulations of experimentally observed magnetohydrodynamic (MHD) bursts in DIII-D [J. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)] L-mode negative central magnetic shear (NCS) discharges were performed with a full three-dimensional nonlinear MHD code. The effects of plasma rotation in the presence of resistivity and viscosity are included and an effectively implicit numerical scheme allows the transport profile to evolve self-consistently with the nonlinear MHD instabilities and externally applied sources and sinks. The simulations follow the MHD bursts and disruptions through the linear and nonlinear phases and identify the connections between the early MHD bursts and the ultimate disruption phase. Specific predictions of the growth and saturation of the modes are directly compared with experimental diagnostic measurements in DIII-D. The simulations show that the bursts observed in experiments are triggered by MHD instability of a resistive interchange mode and a resistive kink mode that are excited for critical plasma profiles. The critical profiles are determined by the balance between inductive and noninductive sources of current density.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-01
Publisher Place United States
Journal Physics of Plasmas
Volume Number 8
Issue Number 8


Open content in new tab

   Open content in new tab