1D simulation of sawtooth crash based on transport bifurcation

T. Kubota, S. I. Itoh, M. Yagi, A. Fukuyama

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The crash of the temperature profile associated with a propagating transport bifurcation between the L-mode and the magnetic braiding mode (M-mode) in a tokamak plasma is presented. The magnetic braiding mode is induced by the magnetic stochasticity. If the pressure gradient exceeds a threshold value a magnetic stochasticity sets in and the heat conductivity is much enhanced (M-mode). The back transition to the L-mode occurs when the pressure gradient decreases to another threshold value. The model of the transport bifurcation is included in the 1D transport code. The crash of the temperature profile and the propagation of the crash front (avalanche) are realized by this model. The collapse without a precursor oscillation is revealed.

Original languageEnglish
Pages (from-to)1397-1407
Number of pages11
JournalPlasma Physics and Controlled Fusion
Volume39
Issue number9
DOIs
Publication statusPublished - Dec 1 1997

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crashes
Pressure gradient
Thermal conductivity
pressure gradients
simulation
temperature profiles
Plasmas
Temperature
thresholds
avalanches
heat
conductivity
oscillations
propagation

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

1D simulation of sawtooth crash based on transport bifurcation. / Kubota, T.; Itoh, S. I.; Yagi, M.; Fukuyama, A.

In: Plasma Physics and Controlled Fusion, Vol. 39, No. 9, 01.12.1997, p. 1397-1407.

Research output: Contribution to journalArticle

Kubota, T. ; Itoh, S. I. ; Yagi, M. ; Fukuyama, A. / 1D simulation of sawtooth crash based on transport bifurcation. In: Plasma Physics and Controlled Fusion. 1997 ; Vol. 39, No. 9. pp. 1397-1407.
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