The role of stochasticity in sawtooth oscillations

A. J. Lichtenberg, K. Itoh, S. I. Itoh, A. Fukuyama

研究成果: ジャーナルへの寄稿学術誌査読

92 被引用数 (Scopus)

抄録

Stochastization of field lines, resulting from the interaction of the fundamental m/n=1/1 helical mode with other periodicities, plays an important role in sawtooth oscillations. The time-scale for stochastic temperature diffusion is shown to be sufficiently fast to account for the fast sawtooth crash. The enhanced electron and ion viscosities arising from the stochastic field lines are calculated. The enhanced electron viscosity always leads to an initial increase in the growth rate of the mode-the 'magnetic trigger'. The enhanced ion viscosity can ultimately lead to mode stabilization before a complete temperature redistribution or flux reconnection has occurred. A dynamical model is introduced to calculate the path of the sawtooth oscillation through the parameter space of shear and amplitude of the helical perturbation, including a stochastic trigger to an enhanced growth rate, stabilization by ion viscosity and a prescription for flux reconnection at the end of the growth phase.

本文言語英語
論文番号I12
ページ(範囲)495-512
ページ数18
ジャーナルNuclear Fusion
32
3
DOI
出版ステータス出版済み - 12月 1 1992

!!!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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