Non-perturbative models of intermittency in drift-wave turbulence: Towards a probabilistic theory of anomalous transport

Eun Jin Kim, P. H. Diamond, M. Malkov, T. S. Hahm, K. Itoh, S. I. Itoh, S. Champeaux, I. Gruzinov, O. Gurcan, C. Holland, M. N. Rosenbluth, A. Smolyakov

研究成果: Contribution to journalArticle査読

37 被引用数 (Scopus)

抄録

Two examples of non-perturbative models of intermittency in drift-wave (DW) turbulence are presented. The first is a calculation of the probability distribution function (PDF) of ion heat flux due to structures in ion temperature gradient turbulence. The instanton calculus predicts the PDF to be a stretched exponential. The second is a derivation of a bi-variate Burgers equation for the evolution of the DW population density in the presence of radially extended streamer flows. The PDF of fluctuation intensity avalanches is determined. The relation of this to turbulence spreading, observed in simulations, is discussed.

本文言語英語
ページ(範囲)961-968
ページ数8
ジャーナルNuclear Fusion
43
9
DOI
出版ステータス出版済み - 9 2003

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 凝縮系物理学

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