A flux-balanced fluid model for collisional plasma edge turbulence: Model derivation and basic physical features

Research output: Contribution to journalArticle

Abstract

We propose a new reduced fluid model for the study of the drift wave-zonal flow dynamics in magnetically confined plasmas. Our model can be viewed as an extension of the classic Hasegawa-Wakatani (HW) model and is based on an improved treatment of the electron dynamics parallel to the field lines, to guarantee a balanced electron flux on the magnetic surfaces. Our flux-balanced HW (bHW) model contains the same drift-wave instability as previous HW models, but unlike these models, it converges exactly to the modified Hasegawa-Mima model in the collisionless limit. We rely on direct numerical simulations to illustrate some of the key features of the bHW model, such as the enhanced variability in the turbulent fluctuations and the existence of stronger and more turbulent zonal jets than the jets observed in other HW models, especially for high plasma resistivity. Our simulations also highlight the crucial role of the feedback of the third-order statistical moments in achieving a statistical equilibrium with strong zonal structures. Finally, we investigate the changes in the observed dynamics when more general dissipation effects are included and, in particular, when we include the reduced model for ion Landau damping originally proposed by Wakatani and Hasegawa.

Original languageEnglish (US)
Article number102307
JournalPhysics of Plasmas
Volume25
Issue number10
DOIs
StatePublished - Oct 1 2018

ASJC Scopus subject areas

  • Condensed Matter Physics

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