Deuterium-tritium plasmas in novel regimes in the Tokamak Fusion Test Reactor

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Experiments in the Tokamak Fusion Test Reactor (TFTR) have explored several novel regimes of improved tokamak confinement in deuterium-tritium (D-T) plasmas, including plasmas with reduced or reversed magnetic shear in the core and high-current plasmas with increased shear in the outer region (high-l{sub i}). New techniques have also been developed to enhance the confinement in these regimes by modifying the plasma-limiter interaction through in-situ deposition of lithium. In reversed-shear plasmas, transitions to enhanced confinement have been observed at plasma currents up to 2.2 MA (q{sub a} {approx} 4.3), accompanied by the formation of internal transport barriers, where large radial gradients ... continued below

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26 p.

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Bell, M.G.; Beer, M. & Batha, S. February 1, 1997.

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  • Bell, M.G.
  • Beer, M. Princeton Univ., NJ (United States). Princeton Plasma Physics Lab.
  • Batha, S. Fusion Physics and Technology, Torrance, CA (United States)

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Experiments in the Tokamak Fusion Test Reactor (TFTR) have explored several novel regimes of improved tokamak confinement in deuterium-tritium (D-T) plasmas, including plasmas with reduced or reversed magnetic shear in the core and high-current plasmas with increased shear in the outer region (high-l{sub i}). New techniques have also been developed to enhance the confinement in these regimes by modifying the plasma-limiter interaction through in-situ deposition of lithium. In reversed-shear plasmas, transitions to enhanced confinement have been observed at plasma currents up to 2.2 MA (q{sub a} {approx} 4.3), accompanied by the formation of internal transport barriers, where large radial gradients develop in the temperature and density profiles. Experiments have been performed to elucidate the mechanism of the barrier formation and its relationship with the magnetic configuration and with the heating characteristics. The increased stability of high-current, high-l{sub i} plasmas produced by rapid expansion of the minor cross-section, coupled with improvement in the confinement by lithium deposition has enabled the achievement of high fusion power, up to 8.7 MW, with D-T neutral beam heating. The physics of fusion alpha-particle confinement has been investigated in these regimes, including the interactions of the alphas with endogenous plasma instabilities and externally applied waves in the ion cyclotron range of frequencies. In D-T plasmas with q{sub 0} > 1 and weak magnetic shear in the central region, a toroidal Alfven eigenmode instability driven purely by the alpha particles has been observed for the first time. The interactions of energetic ions with ion Bernstein waves produced by mode-conversion from fast waves in mixed-species plasmas have been studied as a possible mechanism for transferring the energy of the alphas to fuel ions.

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26 p.

Notes

Also available from the following url: http://www.pppl.gov. See PPPL reports section for full text.; OSTI as DE97051925

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  • Meeting of the Division of Plasma Physics of the American Physical Society, Denver, CO (United States), 11-15 Nov 1996

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  • Other: DE97051925
  • Report No.: PPPL--3230
  • Report No.: CONF-961102--
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 304144
  • Archival Resource Key: ark:/67531/metadc676333

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  • February 1, 1997

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  • July 25, 2015, 2:20 a.m.

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  • April 15, 2016, 8:06 p.m.

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Bell, M.G.; Beer, M. & Batha, S. Deuterium-tritium plasmas in novel regimes in the Tokamak Fusion Test Reactor, article, February 1, 1997; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc676333/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.