Spectral transition of multiscale turbulence in the tokamak pedestal

Belli, E. A.; Candy, J.; Sfiligoi, I.

doi:10.1088/1361-6587/aca9fa

Title: Spectral transition of multiscale turbulence in the tokamak pedestal

Journal Article · Mon Dec 19 00:00:00 EST 2022 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aca9fa· OSTI ID:1970497

^[1];

^[2]

General Atomics, San Diego, CA (United States)
Univ. of California San Diego, La Jolla, CA (United States)

The transition in the turbulence spectrum from ion-scale dominated regimes to multiscale transport regimes that couple ion and electron scales is studied with gyrokinetic simulations of turbulent transport. The simulations are based on DIII-D high-confinement mode (H-mode) plasma parameters in the tokamak pedestal. The transition is initiated by varying the ion temperature gradient. To our knowledge, no full multiscale simulations of pedestal-like transport have been done previously. The experimental parameters lie in a bifurcation region between the two regimes. At long wavelengths, a complex, ion-direction hybrid mode is the dominant linearly unstable drift wave, while an electron temperature gradient-driven mode is unstable at short wavelengths. In the transition from the multiscale branch to the ion-scale branch, the magnitude of the ion-scale poloidal wavenumber spectrum of the nonlinear turbulent energy flux increases and the magnitude of the high-wavenumber spectrum decreases. Here, the decrease in the electron-scale transport is due to nonlinear mixing with ion-scale fluctuations and the ion-scale-driven zonal flows. A shift in the total energy associated with the fluctuating electrostatic potential intensity from dominantly drift kinetic energy in the multiscale regime to dominantly potential intensity in the ion-scale regime is well-correlated with the trend in the total energy flux.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC) Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: FG02-95ER54309; FC02-06ER54873; SC0017992; AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1970497

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 65, Issue 2; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
multiscale
tokamak
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pedestal
gyrokinetic
transport
H-mode

Title: Spectral transition of multiscale turbulence in the tokamak pedestal

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