Predicting the critical gradient of ITG turbulence in fusion plasmas

M.J. Pueschel (Corresponding author), P.Y. Li, P.W. Terry

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The quasilinear mixing-length approach to efficient prediction of transport in fusion devices is improved to account for the 'Dimits' upshift between linear and nonlinear critical pressure gradients in zonal-flow-saturated turbulence regimes. This modification uses the frequency mismatch between modes interacting turbulently to track changes in saturation efficiency. Near criticality, energy is transferred exclusively to stable eigenmodes, rapidly increasing the efficacy of the nonlinearity. The modified quasilinear model is able to predict below-threshold turbulent ion-temperature-gradient-driven transport accurately and also yields significantly improved predictions for trapped-electron-mode transpor.

Original languageEnglish
Article number054003
Number of pages6
JournalNuclear Fusion
Volume61
Issue number5
DOIs
Publication statusPublished - Apr 2021

Keywords

  • Critical gradient
  • Nonlinear energy transfer
  • Quasilinear
  • Transport
  • Turbulence

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