Dynamic structure in self-sustained turbulence

K. Itoh, S. I. Itoh, M. Yagi, A. Fukuyama

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A dynamical equation for self-sustained and pressure-driven turbulence in toroidal plasmas is derived. The growth rate of the dressed-test mode, which belongs to the subcritical turbulence, is obtained as a function of the turbulent transport coefficient. In the limit of a low fluctuation level, the mode has nonlinear instability and shows explosive growth. The growth rate vanishes when the driven transport reaches a stationary-turbulent level. The stationary solution is thermodynamically stable. The characteristic time, by which the stationary and self-sustained turbulence are established, scales with the ion-sound transit time and is accelerated by bad magnetic curvature. The influence of the pressure gradient as well as the radial electric field inhomogeneity are quantified.

Original languageEnglish
Pages (from-to)2079-2096
Number of pages18
JournalPlasma Physics and Controlled Fusion
Volume38
Issue number12
DOIs
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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