A model of the saturation of coupled electron and ion scale gyrokinetic turbulence

Staebler, Gary M.; Howard, Nathan T.; Candy, Jeffrey M.; Holland, Christopher G.

doi:10.1088/1741-4326/aa6bee

A model of the saturation of coupled electron and ion scale gyrokinetic turbulence

Journal Article · Tue May 09 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa6bee· OSTI ID:1374837

Staebler, Gary M. ^[1]; Howard, Nathan T. ^[2]; Candy, Jeffrey M. ^[3]; Holland, Christopher G. ^[4]

General Atomics, San Diego, CA (United States); General Atomics
Oak Ridge Institute for Science Education (ORISE), Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Univ. of California San Diego (UCSD), La Jolla, CA (United States)

A new paradigm of zonal flow mixing as the mechanism by which zonal E × B fluctuations impact the saturation of gyrokinetic turbulence has recently been deduced from the nonlinear 2D spectrum of electric potential fluctuations in gyrokinetic simulations. These state of the art simulations span the physical scales of both ion and electron turbulence. It was found that the zonal flow mixing rate, rather than zonal flow shearing rate, competes with linear growth at both electron and ion scales. A model for saturation of the turbulence by the zonal flow mixing was developed and applied to the quasilinear trapped gyro-Landau fluid transport model (TGLF). The first validation tests of the new saturation model are reported in this paper with data from L-mode and high-β_p regime discharges from the DIII-D tokamak. Lastly, the shortfall in the predicted L-mode edge electron energy transport is improved with the new saturation model for these discharges but additional multiscale simulations are required in order to verify the safety factor and collisionality dependencies found in the modeling.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1374837

Alternate ID(s):: OSTI ID: 22766059
OSTI ID: 22925723

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 6 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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