Anomalous Convection Reversal due to Turbulence Transition in Tokamak Plasmas

A critical physical model, based on the ion temperature gradient （ITG） mode and the trapped electron mode （TEM）, trying to explain the spatio-temporal dynamics of anomalous particle convection reversal （i.e., the particle convective flux reverses from inward to outward）, is developed numerically. Th...

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Published inChinese physics letters Vol. 32; no. 3; pp. 70 - 73
Main Author 孙恬恬 陈少永 王占辉 彭晓东 黄捷 牟茂淋 唐昌建
Format Journal Article
LanguageEnglish
Published 01.03.2015
Subjects
Computational fluid dynamics
Convection
Convection modes
Density
Mathematical models
Plasmas
Tokamak devices
Turbulence
反常
对流
托卡马克等离子体
时空动力学
物理模型
离子温度梯度
致密度
逆转
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/3/035201

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Summary:A critical physical model, based on the ion temperature gradient （ITG） mode and the trapped electron mode （TEM）, trying to explain the spatio-temporal dynamics of anomalous particle convection reversal （i.e., the particle convective flux reverses from inward to outward）, is developed numerically. The dependence of density peaking and profile shape on the particle convection is studied. Only the inward pinch could lead to the increase of the density peaking. The validation of the critical model is also analyzed. A comparison of the estimates calculated by the model and the experimental results from the Tore Supra tokamak shows that they are qualitatively both consistent.
Bibliography:11-1959/O4
A critical physical model, based on the ion temperature gradient （ITG） mode and the trapped electron mode （TEM）, trying to explain the spatio-temporal dynamics of anomalous particle convection reversal （i.e., the particle convective flux reverses from inward to outward）, is developed numerically. The dependence of density peaking and profile shape on the particle convection is studied. Only the inward pinch could lead to the increase of the density peaking. The validation of the critical model is also analyzed. A comparison of the estimates calculated by the model and the experimental results from the Tore Supra tokamak shows that they are qualitatively both consistent.
SUN Tian-Tian, CHEN Shao-Yong, WANG Zhan-Hui, PENG Xiao-Dong, HUANG Jie, MOU Mao-Lin, TANG Chang-Jian（1.College of Physical Science and Technology, Sichuan University, Chengdu 610064; 2.Southwestern Institute of Physics, Chengdu 610041）
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/3/035201