An Analytical APproach to the Turbulence—Relaxed State in Tokamak Plasmas |
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摘 要: |
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关 键 词: | 托卡马克等离子体 湍流态 解析研究 |
收稿时间: | 2002-05-08 |
An Analytical Approach to the Turbulence-Relaxed State
in Tokamak Plasmas |
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Authors: | PENG Xiao-Dong and QIU Xiao-Ming |
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Institution: | Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041,
China |
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Abstract: | Starting from the continuity, temperature, and motion equations
of the trapped electron fluid in general tokamak magnetic field
with positive or reversed shear and the definition of Lagrangian
invariant, dL/dt≡(\partialt+
u•▽)L=0, where
u is convective velocity, the trapped electron dynamics is considered in the following two assumptions: (i)
the turbulence is low frequency electrostatic, and (ii) L is a functional only of the density n, temperature T, and magnetic field B, and the effect of perturbation
potential φ is included in the convective velocity u, i.e.,
u is a functional of n, T, B, and φ. The Lagrangian invariant hidden in the trapped electron dynamics is strictly found:
L=ln(n/B)c1(T/B2/3)c2], where
c1 and c2 are dimensionless changeable parameters and
c1∝c2. From this Lagrangian invariant
the turbulent particle and electron
thermal transport scaling laws are derived:
〈n>ψq(ψ)=const. and
〈T3/2>ψq(ψ)=const.,
which, in the limit of large aspect ratio, reduce to
n(r)q(r)=const.
and T3/2(r)q(r)=const., respectively. The latter two scaling
laws are compared with existent experimental results, being in good
agreement. |
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Keywords: | tokamak plasma turbulence Lagrangian invariant |
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