M Okabayashi et al 2002 Plasma Phys. Control. Fusion 44 B339 doi:10.1088/0741-3335/44/12B/324
M Okabayashi1, J Bialek2, M S Chance1, M S Chu3, E D Fredrickson1, A M Garofalo2, R Hatcher1, T H Jensen3, L C Johnson1, R J La Haye3, G A Navratil2, H Reimerdes2, J T Scoville3, E J Strait3, A D Turnbull3, M L Walker3 and the DIII–D Team
Show affiliationsSuppression of the resistive wall mode (RWM) has been successfully demonstrated in the DIII–D tokamak by using rotational stabilization in conjunction with a close-fitting vacuum vessel wall. The duration of the high-pressure discharge was extended to hundreds of times the wall skin time. Frequently, the plasma pressure reached the ideal-wall magnetohydrodynamic (MHD) kink limit. The confined pressure is up to twice as high as the no-wall ideal MHD kink limit. Near its marginal stability point, the RWM is found to resonate with residual non-axisymmetric fields (e.g. components of the error field). A magnetic feedback system has been used to identify and compensate for the residual non-axisymmetric fields. This is to the best of our knowledge, the first demonstration of the sustainment of a stable plasma with pressure at levels well above the no-wall pressure limit. This technique is expected to be applicable to other toroidal devices.
Issue 12B (December 2002)
Received 24 September 2002
Published 21 November 2002
M Okabayashi et al 2002 Plasma Phys. Control. Fusion 44 B339
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