Dimits shift, avalanche-like bursts, and solitary propagating structures in the two-field flux-balanced Hasegawa–Wakatani model for plasma edge turbulence

Qi, Di; Majda, Andrew J.; Cerfon, Antoine J.

doi:10.1063/5.0018943

Title: Dimits shift, avalanche-like bursts, and solitary propagating structures in the two-field flux-balanced Hasegawa–Wakatani model for plasma edge turbulence

Journal Article · Wed Oct 14 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0018943· OSTI ID:1849941

^[1]; Majda, Andrew J. ^[1];

^[2]

New York Univ. (NYU), NY (United States). Dept. of Mathematics, Courant Inst. of Mathematical Sciences; New York Univ. (NYU), NY (United States). Center for Atmosphere and Ocean Science. Courant Inst. of Mathematical Sciences
New York Univ. (NYU), NY (United States). Dept. of Mathematics, Courant Inst. of Mathematical Sciences

We show that the recently introduced two-field flux-balanced Hasegawa–Wakatani (BHW) model captures the key features of drift-wave turbulent transport mediated by zonal flows observed in more complete and accurate gyrokinetic simulations, such as the existence of a nonlinear upshift of the threshold for drift wave turbulence driven transport, often called the Dimits shift, as well as non-local transport with avalanche bursts and solitary propagating structures. Because of the approximations made in the BHW model, these observations are made for the particle flux instead of the heat flux more commonly studied in ion temperature gradient (ITG) driven turbulence in fluid or gyrokinetic codes. Many of these features are not seen in other Hasegawa–Wakatani models, which confirm the critical role of the electron dynamics parallel to the magnetic field lines. To address questions regarding the role of boundary conditions on the drift-wave zonal flow dynamics, we apply our model to both a channel domain geometry and the more typical doubly periodic geometry. We only observe strong soliton-like solutions in the particle flux for the channel geometry, in the vicinity of the boundaries, where strong velocity shear and density gradients are generated, which are absent in the doubly periodic simulations. Changing the aspect ratio of the simulation domain also has a significant effect. In domains which are elongated in the radial direction, more complex multi-scale dynamics takes place, with multiple zonal jets interacting with each other, and large scale avalanches.

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Research Organization:: New York Univ. (NYU), NY (United States)

Sponsoring Organization:: US Department of the Navy, Office of Naval Research (ONR); Simons Foundation (SFARI); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-86ER53223; SC0012398; N00014-19-1-2286; 560651

OSTI ID:: 1849941

Alternate ID(s):: OSTI ID: 1970547

Journal Information:: Physics of Plasmas, Vol. 27, Issue 10; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Dimits shift, avalanche-like bursts, and solitary propagating structures in the two-field flux-balanced Hasegawa–Wakatani model for plasma edge turbulence

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