Stabilization and prevention of the 2/1 neoclassical tearing mode for improved performance in DIII-D

R. Prater, R. J. La Haye, T. C. Luce, C. C. Petty, E. J. Strait, J. R. Ferron, D. A. Humphreys, A. Isayama, J. Lohr, K. Nagasaki, P. A. Politzer, M. R. Wade, A. S. Welander

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Abstract

The m ≤ 2/n ≤ 1 neoclassical tearing mode (NTM) has been observed to strongly degrade confinement and frequently lead to a disruption in high β discharges in DIII-D if allowed to grow to a large size. Stabilization of grown NTMs by the application of a highly localized electron cyclotron current drive (ECCD) at the island location has led to operation at an increased plasma pressure, up to the no-wall kink limit. After the NTM is stabilized by the ECCD, the correct location for the current drive is maintained using information from real-time equilibrium reconstructions which include measurements from the motional Stark effect diagnostic. This same process is used alternatively to prevent the mode from ever growing, leading to performance at the pressure limit in high performance hybrid discharges with β above 4%. Modelling using the modified Rutherford equation shows that the required power is in close agreement with the experimental threshold for the prevention of the 2/1 NTM.

Original languageEnglish
Article number001
JournalNuclear Fusion
Volume47
Issue number5
DOIs
StatePublished - May 1 2007
Externally publishedYes

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