Sustained stabilization of the resistive-wall mode by plasma rotation in the DIII-D tokamak.
Values of the normalized plasma pressure up to twice the free-boundary stability limit predicted by ideal magnetohydrodynamic (MHD) theory have been sustained in the DIII-D tokamak. Long-wavelength modes are stabilized by the resistive wall and rapid plasma toroidal rotation. High rotation speed is maintained by minimization of nonaxisymmetric magnetic fields, overcoming a long-standing impediment [E. J. Strait, Phys. Rev. Lett. 74, 2483 (1995)]]. The ideal-MHD pressure limit calculated with an ideal wall is observed as the operational limit to the normalized plasma pressure.
Garofalo
A M
AM
General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA. garafalo@fusion.gat.com
Strait
E J
EJ
Johnson
L C
LC
La Haye
R J
RJ
Lazarus
E A
EA
Navratil
G A
GA
Okabayashi
M
M
Scoville
J T
JT
Taylor
T S
TS
Turnbull
A D
AD