Complete Suppression of the M/N=2/1 Neoclassical Tearing Mode Using Radially Localized Electron Cyclotron Current Drive on Diii-D and the Requirements for Iter

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OAK-B135 DIII-D experiments demonstrate the first real-time feedback control of the relative location of a narrow beam of microwaves to completely suppress and eliminate a growing tearing mode at the q=2 surface. long wavelength tearing modes such as the m/n = 2/1 instability are particularly deleterious to tokamak operation. Confinement is seriously degraded by the island, plasma rotation can cease (mode-lock) and disruption can occur. The neoclassical tearing mode (NTM) becomes unstable due to the presence of a helically-perturbed bootstrap current and can be stabilized by replacing the missing bootstrap current in the island O-point by precisely located co-electron cyclotron … continued below

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8 pages

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La Haye, R. J.; Luce, T. C.; Petty, C. C.; Humphreys, D. A.; Hyatt, A. W.; Perkins, F. W. et al. June 1, 2003.

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OAK-B135 DIII-D experiments demonstrate the first real-time feedback control of the relative location of a narrow beam of microwaves to completely suppress and eliminate a growing tearing mode at the q=2 surface. long wavelength tearing modes such as the m/n = 2/1 instability are particularly deleterious to tokamak operation. Confinement is seriously degraded by the island, plasma rotation can cease (mode-lock) and disruption can occur. The neoclassical tearing mode (NTM) becomes unstable due to the presence of a helically-perturbed bootstrap current and can be stabilized by replacing the missing bootstrap current in the island O-point by precisely located co-electron cyclotron current drive (ECCD). The geometry for the ECCD launch, the second harmonic resonance 2f{sub ce} and the q=2 surface are shown. The optimum position is found when the DIII-D plasma control system (PCS) is put into a search and suppress mode that makes small radial shifts (in about 1 cm steps) in the ECCD location based on minimizing the Mirnov amplitude.

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8 pages

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INIS; OSTI as DE00821558

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  • IAEA TECHNICAL MEETING ON ECRH PHYSICS AND TECHNOLOGY FOR ITER, KLOSTER-SEEON (DE), 07/14/2003--07/16/2003

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  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 821558
  • Archival Resource Key: ark:/67531/metadc779672

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  • June 1, 2003

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  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 20, 2021, 2:49 p.m.

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La Haye, R. J.; Luce, T. C.; Petty, C. C.; Humphreys, D. A.; Hyatt, A. W.; Perkins, F. W. et al. Complete Suppression of the M/N=2/1 Neoclassical Tearing Mode Using Radially Localized Electron Cyclotron Current Drive on Diii-D and the Requirements for Iter, article, June 1, 2003; United States. (https://digital.library.unt.edu/ark:/67531/metadc779672/: accessed July 15, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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