On how fast ions enhance the regulation of drift wave turbulence by zonal flows

Choi, G. J.; Diamond, P. H.; Hahm, T. S.

doi:10.1088/1741-4326/ad0f5f

Title: On how fast ions enhance the regulation of drift wave turbulence by zonal flows

Journal Article · 04 December 2023 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad0f5f · OSTI ID:2228763

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Abstract This paper presents a mechanism for enhanced regulation of drift wave turbulence by zonal flows in the presence of a fast ion population. It demonstrates that dilution effects due to the energetic particles (EPs) have a far-reaching impact on all aspects of the nonlinear dynamics. The modulational growth of zonal flow shear and the corresponding evolution of drift wave energy are calculated with dilution effects. The coupled zonal flow growth and drift wave energy equations are reduced to a predator–prey model. This is solved for the fixed points, which represents the various states of the system. Results display a strong dependence on dilution, which leads to greatly reduced levels of saturated turbulence and transport. Implications for the FIRE mode plasma of KSTAR are discussed in detail. This model is perhaps the simplest dynamical one which captures the beneficial effects of EPs on confinement.

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Research Organization:: University of California San Diego, La Jolla, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-04ER54738

OSTI ID:: 2228763

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 64; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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Title: On how fast ions enhance the regulation of drift wave turbulence by zonal flows

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