Theory of self-organized critical transport in tokamak plasmas Page: 2 of 58
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Theory of Self-Organized Critical Transport in
Y. Kishimoto, T. Tajima,a) W. Horton, M.J. LeBrun, and J.-Y. Kim
Naka Fusion Research Establishment
Japan Atomic Energy Research Institute
Naka, Ibaraki, 311-01 Japan
Institute for Fusion Studies, The University of Texas at Austin
Austin, Texas 78712 USA
A theoretical and computational study of the ion temperature gradient and m instabilities
in tokamak plasmas has been carried out. In toroidal geometry the modes have a radially ex-
tended structure and their eigenfrequencies are constant over many rational surfaces that are
coupled through toroidicity. These nonlocal properties of the ITG modes impose strong con-
straint on the drift mode fluctuations and the associated transport, showing a self-organized
characteristic. As any significant deviation away from marginal stability causes rapid tem-
perature relaxation and intermittent bursts, the modes hover near marginality and exhibit
strong kinetic characteristics. As a result, the temperature relaxation is self-similar and
nonlocal, leading to a radially increasing heat diffusivity. The nonlocal transport leads to
the Bohm-like diffusion scaling. The heat input regulates the deviation of the temperature
gradient away from marginality. The obtained transport scalings and properties are globally
consistent with experimental observations of L-mode discharges.
')Also at Advanced Science Research Center, Japan Atomic Energy Research Institute Naka, Ibaraki
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Kishimoto, Y.; Tajima, T.; Horton, W.; LeBrun, M.J. & Kim, J.Y. Theory of self-organized critical transport in tokamak plasmas, report, July 1, 1995; Austin, Texas. (https://digital.library.unt.edu/ark:/67531/metadc623377/m1/2/: accessed June 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.