Theory of self-organized critical transport in tokamak plasmas

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A theoretical and computational study of the ion temperature gradient and {eta}{sub i} instabilities in tokamak plasmas has been carried out. In toroidal geometry the modes have a radially extended structure and their eigenfrequencies are constant over many rational surfaces that are coupled through toroidicity. These nonlocal properties of the ITG modes impose strong constraint on the drift mode fluctuations and the amciated transport, showing a self-organized characteristic. As any significant deviation away from marginal stability causes rapid temperature relaxation and intermittent bursts, the modes hover near marginality and exhibit strong kinetic characteristics. As a result, the temperature relaxation is ... continued below

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56 p.

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Kishimoto, Y.; Tajima, T.; Horton, W.; LeBrun, M.J. & Kim, J.Y. July 1, 1995.

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Description

A theoretical and computational study of the ion temperature gradient and {eta}{sub i} instabilities in tokamak plasmas has been carried out. In toroidal geometry the modes have a radially extended structure and their eigenfrequencies are constant over many rational surfaces that are coupled through toroidicity. These nonlocal properties of the ITG modes impose strong constraint on the drift mode fluctuations and the amciated transport, showing a self-organized characteristic. As any significant deviation away from marginal stability causes rapid temperature relaxation and intermittent bursts, the modes hover near marginality and exhibit strong kinetic characteristics. As a result, the temperature relaxation is self-semilar 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 charges.

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56 p.

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INIS; OSTI as DE95015449

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  • Other Information: PBD: Jul 1995

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  • Other: DE95015449
  • Report No.: DOE/ET/53088--711
  • Grant Number: FG05-80ET53088
  • DOI: 10.2172/100314 | External Link
  • Office of Scientific & Technical Information Report Number: 100314
  • Archival Resource Key: ark:/67531/metadc623377

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  • July 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Aug. 10, 2016, 2:15 p.m.

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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. (digital.library.unt.edu/ark:/67531/metadc623377/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.