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

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

Abstract

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.

Authors:

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

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

Publication Date:: Tue May 09 00:00:00 EDT 2017

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

Sponsoring Org.:: USDOE Office of Nuclear Energy (NE)

OSTI Identifier:: 1374837

Grant/Contract Number:: FC02-04ER54698

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Fusion

Additional Journal Information:: Journal Volume: 57; Journal Issue: 6; Journal ID: ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; gyrokinetic turbulence; zonal flows; multi-scale transport; L-mode transport shortfall; tokamak transport

Citation Formats


                    Staebler, Gary M., Howard, Nathan T., Candy, Jeffrey M., and Holland, Christopher G. A model of the saturation of coupled electron and ion scale gyrokinetic turbulence.  United States: N. p., 2017. 
Web.  doi:10.1088/1741-4326/aa6bee.

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                    Staebler, Gary M., Howard, Nathan T., Candy, Jeffrey M., & Holland, Christopher G. A model of the saturation of coupled electron and ion scale gyrokinetic turbulence.  United States.  https://doi.org/10.1088/1741-4326/aa6bee

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                    Staebler, Gary M., Howard, Nathan T., Candy, Jeffrey M., and Holland, Christopher G. Tue .  
"A model of the saturation of coupled electron and ion scale gyrokinetic turbulence".  United States.  https://doi.org/10.1088/1741-4326/aa6bee.  https://www.osti.gov/servlets/purl/1374837.

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@article{osti_1374837,

  title        = {A model of the saturation of coupled electron and ion scale gyrokinetic turbulence},

  author       = {Staebler, Gary M. and Howard, Nathan T. and Candy, Jeffrey M. and Holland, Christopher G.},

  abstractNote = {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-βp 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.},

  doi          = {10.1088/1741-4326/aa6bee},

  journal      = {Nuclear Fusion},

  number       = 6,

  volume       = 57,

  place        = {United States},

  year         = {Tue May 09 00:00:00 EDT 2017},

  month        = {Tue May 09 00:00:00 EDT 2017}

}

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Similar Records

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

Abstract

Citation Formats

Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes journal, July 1994

Scalings of Ion-Temperature-Gradient-Driven Anomalous Transport in Tokamaks journal, July 1996

An Eulerian gyrokinetic-Maxwell solver journal, April 2003

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Overview of the Alcator C-Mod Research Program journal, September 2009

Predictions of the near edge transport shortfall in DIII-D L-mode plasmas using the trapped gyro-Landau-fluid model journal, January 2015

Scaling of heat transport with collisionality journal, March 1999

Big Dee - A Flexible Facility Operating Near Breakeven Conditions journal, July 1985

Progress toward steady-state tokamak operation exploiting the high bootstrap current fraction regime journal, June 2016

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Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes
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Scalings of Ion-Temperature-Gradient-Driven Anomalous Transport in Tokamaks
journal, July 1996

An Eulerian gyrokinetic-Maxwell solver
journal, April 2003

Gyro-Landau fluid equations for trapped and passing particles
journal, October 2005

Electron Temperature Gradient Turbulence
journal, December 2000

The role of zonal flows in the saturation of multi-scale gyrokinetic turbulence
journal, June 2016

Overview of the Alcator C-Mod Research Program
journal, September 2009

Predictions of the near edge transport shortfall in DIII-D L-mode plasmas using the trapped gyro-Landau-fluid model
journal, January 2015

Scaling of heat transport with collisionality
journal, March 1999

Big Dee - A Flexible Facility Operating Near Breakeven Conditions
journal, July 1985

Progress toward steady-state tokamak operation exploiting the high bootstrap current fraction regime
journal, June 2016

Kinetic calculation of neoclassical transport including self-consistent electron and impurity dynamics
journal, July 2008

Advances in validating gyrokinetic turbulence models against L- and H-mode plasmas
journal, May 2011

Transport barriers in bootstrap-driven tokamaks
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Gyrokinetic GENE simulations of DIII-D near-edge L-mode plasmas
journal, September 2019

Propagation of input parameter uncertainties in transport models
journal, October 2018

Predict-first experiments and modeling of perturbative cold pulses in the DIII-D tokamak
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VITALS: A Surrogate-Based Optimization Framework for the Accelerated Validation of Plasma Transport Codes
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Criteria for the importance of multi-scale interactions in turbulent transport simulations
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