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Title: Theory of self-organized critical transport in tokamak plasmas

Abstract

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.

Authors:
; ; ; ;  [1]
  1. Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment|[Texas Univ., Austin, TX (United States). Inst. for Fusion Studies
Publication Date:
Research Org.:
Texas Univ., Austin, TX (United States). Inst. for Fusion Studies
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
100314
Report Number(s):
DOE/ET/53088-711
ON: DE95015449; TRN: 95:020414
DOE Contract Number:  
FG05-80ET53088
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jul 1995
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; TOKAMAK DEVICES; PLASMA INSTABILITY

Citation Formats

Kishimoto, Y., Tajima, T., Horton, W., LeBrun, M.J., and Kim, J.Y.. Theory of self-organized critical transport in tokamak plasmas. United States: N. p., 1995. Web. doi:10.2172/100314.
Kishimoto, Y., Tajima, T., Horton, W., LeBrun, M.J., & Kim, J.Y.. Theory of self-organized critical transport in tokamak plasmas. United States. doi:10.2172/100314.
Kishimoto, Y., Tajima, T., Horton, W., LeBrun, M.J., and Kim, J.Y.. Sat . "Theory of self-organized critical transport in tokamak plasmas". United States. doi:10.2172/100314. https://www.osti.gov/servlets/purl/100314.
@article{osti_100314,
title = {Theory of self-organized critical transport in tokamak plasmas},
author = {Kishimoto, Y. and Tajima, T. and Horton, W. and LeBrun, M.J. and Kim, J.Y.},
abstractNote = {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.},
doi = {10.2172/100314},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 1995},
month = {Sat Jul 01 00:00:00 EDT 1995}
}

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