Transition in multiple-scale-lengths turbulence in plasmas

S. I. Itoh, K. Itoh, M. Yagi, M. Kawasaki, A. Kitazawa

研究成果: Contribution to journalArticle査読

10 被引用数 (Scopus)

抄録

The statistical theory of strong turbulence in inhomogeneous plasmas is developed for the cases where fluctuations with different scale lengths coexist. Statistical nonlinear interactions between semimicro and micro modes are first kept in the analysis as the drag, noise and drive. The nonlinear dynamics determines both the fluctuation levels and the cross field turbulent transport for the fixed global parameters. A quenching or suppressing effect is induced by their nonlinear interplay, even if both modes are unstable when analyzed independently. Influence of the inhomogeneous global radial electric field is discussed. A new insight is given for the physics of the internal transport barrier. The thermal fluctuation of the scale length of λ D is assumed to be statistically independent. The hierarchical structure is constructed according to the scale lengths. Transitions in turbulence are found and phase diagrams with cusp type catastrophe are obtained. Dynamics is followed. Statistical properties of the subcritical excitation are discussed. The probability density function (PDF) and transition probability are obtained. Power laws are obtained in the PDF as well as in the transition probability. Generalization for the case where turbulence is composed of three classes of modes is also developed. A new catastrophe of turbulent states is obtained.

本文言語英語
ページ(範囲)1947-1954
ページ数8
ジャーナルPhysics of Plasmas
9
5
DOI
出版ステータス出版済み - 5 2002

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学

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