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Title: Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry

Abstract

Linear (local) gyrokinetic predictions of edge microinstabilities in highly shaped, lithiated and non-lithiated NSTX discharges are reported using the gyrokinetic code GS2. Microtearing modes dominate the non-lithiated pedestal top. The stabilization of these modes at the lithiated pedestal top enables the electron temperature pedestal to extend further inwards, as observed experimentally. Kinetic ballooning modes are found to be unstable mainly at the mid-pedestal of both types of discharges, with un- stable trapped electron modes nearer the separatrix region. At electron wavelengths, ETG modes are found to be unstable from mid-pedestal outwards for ηe, exp ~2.2 with higher growth rates for the lithiated discharge. Near the separatrix, the critical temperature gradient for driving ETG modes is reduced in the presence of lithium, re ecting the reduction of the lithiated density gradients observed experimentally. A preliminary linear study in the edge of non-lithiated discharges shows that the equilibrium shaping alters the electrostatic modes stability, found more unstable at high plasma shaping.

Authors:
 [1];  [1]; ORCiD logo [1];  [2];  [3];  [1];  [1];  [1];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  3. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
NSTX-U team
OSTI Identifier:
1273406
Alternate Identifier(s):
OSTI ID: 1259972
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Lithium; Microinstabilities; Plasma gyrokinetics

Citation Formats

Coury, M., Guttenfelder, W., Mikkelsen, D. R., Canik, J. M., Canal, G. P., Diallo, A., Kaye, S., Kramer, G. J., and Maingi, R. Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry. United States: N. p., 2016. Web. doi:10.1063/1.4954911.
Coury, M., Guttenfelder, W., Mikkelsen, D. R., Canik, J. M., Canal, G. P., Diallo, A., Kaye, S., Kramer, G. J., & Maingi, R. Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry. United States. doi:10.1063/1.4954911.
Coury, M., Guttenfelder, W., Mikkelsen, D. R., Canik, J. M., Canal, G. P., Diallo, A., Kaye, S., Kramer, G. J., and Maingi, R. Thu . "Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry". United States. doi:10.1063/1.4954911. https://www.osti.gov/servlets/purl/1273406.
@article{osti_1273406,
title = {Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry},
author = {Coury, M. and Guttenfelder, W. and Mikkelsen, D. R. and Canik, J. M. and Canal, G. P. and Diallo, A. and Kaye, S. and Kramer, G. J. and Maingi, R.},
abstractNote = {Linear (local) gyrokinetic predictions of edge microinstabilities in highly shaped, lithiated and non-lithiated NSTX discharges are reported using the gyrokinetic code GS2. Microtearing modes dominate the non-lithiated pedestal top. The stabilization of these modes at the lithiated pedestal top enables the electron temperature pedestal to extend further inwards, as observed experimentally. Kinetic ballooning modes are found to be unstable mainly at the mid-pedestal of both types of discharges, with un- stable trapped electron modes nearer the separatrix region. At electron wavelengths, ETG modes are found to be unstable from mid-pedestal outwards for ηe, exp ~2.2 with higher growth rates for the lithiated discharge. Near the separatrix, the critical temperature gradient for driving ETG modes is reduced in the presence of lithium, re ecting the reduction of the lithiated density gradients observed experimentally. A preliminary linear study in the edge of non-lithiated discharges shows that the equilibrium shaping alters the electrostatic modes stability, found more unstable at high plasma shaping.},
doi = {10.1063/1.4954911},
journal = {Physics of Plasmas},
number = 6,
volume = 23,
place = {United States},
year = {2016},
month = {6}
}

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Works referenced in this record:

Effects of plasma shaping on nonlinear gyrokinetic turbulence
journal, September 2008

  • Belli, E. A.; Hammett, G. W.; Dorland, W.
  • Physics of Plasmas, Vol. 15, Issue 9
  • DOI: 10.1063/1.2972160

Overview of gyrokinetic studies of finite- β microturbulence
journal, June 2015


Collisionless electron temperature gradient instability
journal, January 1987

  • Lee, Y. C.; Dong, J. Q.; Guzdar, P. N.
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  • DOI: 10.1063/1.866248

Progress in simulating turbulent electron thermal transport in NSTX
journal, August 2013


Recent progress of NSTX lithium program and opportunities for magnetic fusion research
journal, October 2012


Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas
journal, March 2014


Tokamak transport code simulations with drift wave models
journal, January 1987


Dependence of recycling and edge profiles on lithium evaporation in high triangularity, high performance NSTX H-mode discharges
journal, August 2015


Effect of plasma shaping on performance in the National Spherical Torus Experiment
journal, May 2006

  • Gates, D. A.; Maingi, R.; Menard, J.
  • Physics of Plasmas, Vol. 13, Issue 5
  • DOI: 10.1063/1.2198174

Electron temperature gradient driven turbulence
journal, May 2000

  • Jenko, F.; Dorland, W.; Kotschenreuther, M.
  • Physics of Plasmas, Vol. 7, Issue 5
  • DOI: 10.1063/1.874014

The relationships between edge localized modes suppression, pedestal profiles and lithium wall coatings in NSTX
journal, September 2011


Simulating gyrokinetic microinstabilities in stellarator geometry with GS2
journal, December 2011

  • Baumgaertel, J. A.; Belli, E. A.; Dorland, W.
  • Physics of Plasmas, Vol. 18, Issue 12
  • DOI: 10.1063/1.3662064

Critical gradient formula for toroidal electron temperature gradient modes
journal, September 2001

  • Jenko, F.; Dorland, W.; Hammett, G. W.
  • Physics of Plasmas, Vol. 8, Issue 9
  • DOI: 10.1063/1.1391261

Linear gyrokinetic analysis of a DIII-D H-mode pedestal near the ideal ballooning threshold
journal, September 2012


Kinetic Instabilities that Limit β in the Edge of a Tokamak Plasma: A Picture of an H -Mode Pedestal
journal, March 2012


Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities
journal, April 2014

  • Fulton, D. P.; Lin, Z.; Holod, I.
  • Physics of Plasmas, Vol. 21, Issue 4
  • DOI: 10.1063/1.4871387

Linear comparison of gyrokinetic codes with trapped electrons
journal, November 2007


Fully electromagnetic gyrokinetic eigenmode analysis of high-beta shaped plasmas
journal, November 2010

  • Belli, E. A.; Candy, J.
  • Physics of Plasmas, Vol. 17, Issue 11
  • DOI: 10.1063/1.3495976

Gyrokinetic turbulence under near-separatrix or nonaxisymmetric conditions
journal, May 2009

  • Jenko, F.; Told, D.; Xanthopoulos, P.
  • Physics of Plasmas, Vol. 16, Issue 5
  • DOI: 10.1063/1.3089603

Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes
journal, May 2002

  • Snyder, P. B.; Wilson, H. R.; Ferron, J. R.
  • Physics of Plasmas, Vol. 9, Issue 5
  • DOI: 10.1063/1.1449463

Kinetic theory of tearing instability
journal, January 1975

  • Hazeltine, R. D.; Dobrott, D.; Wang, T. S.
  • Physics of Fluids, Vol. 18, Issue 12
  • DOI: 10.1063/1.861097

Gyrokinetic study of ASDEX Upgrade inter-ELM pedestal profile evolution
journal, May 2015


General theory of kinetic ballooning modes
journal, January 1980

  • Frieman, E. A.; Rewoldt, G.; Tang, W. M.
  • Physics of Fluids, Vol. 23, Issue 9
  • DOI: 10.1063/1.863201

A review of models for ELMs
journal, February 1998


Electron Temperature Gradient Turbulence
journal, December 2000


Variational formulation of the linear MHD stability of 3D plasmas with noninteracting hot electrons
journal, June 1992


Edge-Localized-Mode Suppression through Density-Profile Modification with Lithium-Wall Coatings in the National Spherical Torus Experiment
journal, August 2009


Edge microstability of NSTX plasmas without and with lithium-coated plasma-facing components
journal, September 2013


Numerical studies of edge localized instabilities in tokamaks
journal, April 2002

  • Wilson, H. R.; Snyder, P. B.; Huysmans, G. T. A.
  • Physics of Plasmas, Vol. 9, Issue 4
  • DOI: 10.1063/1.1459058

System Size Effects on Gyrokinetic Turbulence
journal, October 2010


Comparisons and physics basis of tokamak transport models and turbulence simulations
journal, March 2000

  • Dimits, A. M.; Bateman, G.; Beer, M. A.
  • Physics of Plasmas, Vol. 7, Issue 3
  • DOI: 10.1063/1.873896

Scaling of linear microtearing stability for a high collisionality National Spherical Torus Experiment discharge
journal, February 2012

  • Guttenfelder, W.; Candy, J.; Kaye, S. M.
  • Physics of Plasmas, Vol. 19, Issue 2
  • DOI: 10.1063/1.3685698

Microturbulence in DIII-D tokamak pedestal. II. Electromagnetic instabilities
journal, August 2015


Stellarator turbulence at electron gyroradius scales
journal, June 2002


Material erosion and migration in tokamaks
journal, November 2005


Trapped particles in toroidal magnetic systems
journal, January 1971


Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
dataset, January 2016

  • Coury, M.; Guttenfelder, W.; Mikkelsen, D.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1367078

Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
dataset, January 2016

  • Coury, M.; Guttenfelder, W.; Mikkelsen, D.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1562034

    Works referencing / citing this record:

    Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
    dataset, January 2016

    • Coury, M.; Guttenfelder, W.; Mikkelsen, D.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1367078

    Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
    dataset, January 2016

    • Coury, M.; Guttenfelder, W.; Mikkelsen, D.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1367078

    Linear comparison of gyrokinetic codes with trapped electrons
    journal, November 2007


    Recent progress of NSTX lithium program and opportunities for magnetic fusion research
    journal, October 2012


    Dependence of recycling and edge profiles on lithium evaporation in high triangularity, high performance NSTX H-mode discharges
    journal, August 2015


    Critical gradient formula for toroidal electron temperature gradient modes
    journal, September 2001

    • Jenko, F.; Dorland, W.; Hammett, G. W.
    • Physics of Plasmas, Vol. 8, Issue 9
    • DOI: 10.1063/1.1391261

    Edge localized modes and the pedestal: A model based on coupled peeling–ballooning modes
    journal, May 2002

    • Snyder, P. B.; Wilson, H. R.; Ferron, J. R.
    • Physics of Plasmas, Vol. 9, Issue 5
    • DOI: 10.1063/1.1449463

    Numerical studies of edge localized instabilities in tokamaks
    journal, April 2002

    • Wilson, H. R.; Snyder, P. B.; Huysmans, G. T. A.
    • Physics of Plasmas, Vol. 9, Issue 4
    • DOI: 10.1063/1.1459058

    Effect of plasma shaping on performance in the National Spherical Torus Experiment
    journal, May 2006

    • Gates, D. A.; Maingi, R.; Menard, J.
    • Physics of Plasmas, Vol. 13, Issue 5
    • DOI: 10.1063/1.2198174

    Effects of plasma shaping on nonlinear gyrokinetic turbulence
    journal, September 2008

    • Belli, E. A.; Hammett, G. W.; Dorland, W.
    • Physics of Plasmas, Vol. 15, Issue 9
    • DOI: 10.1063/1.2972160

    Gyrokinetic turbulence under near-separatrix or nonaxisymmetric conditions
    journal, May 2009

    • Jenko, F.; Told, D.; Xanthopoulos, P.
    • Physics of Plasmas, Vol. 16, Issue 5
    • DOI: 10.1063/1.3089603

    Fully electromagnetic gyrokinetic eigenmode analysis of high-beta shaped plasmas
    journal, November 2010

    • Belli, E. A.; Candy, J.
    • Physics of Plasmas, Vol. 17, Issue 11
    • DOI: 10.1063/1.3495976

    Simulating gyrokinetic microinstabilities in stellarator geometry with GS2
    journal, December 2011

    • Baumgaertel, J. A.; Belli, E. A.; Dorland, W.
    • Physics of Plasmas, Vol. 18, Issue 12
    • DOI: 10.1063/1.3662064

    Scaling of linear microtearing stability for a high collisionality National Spherical Torus Experiment discharge
    journal, February 2012

    • Guttenfelder, W.; Candy, J.; Kaye, S. M.
    • Physics of Plasmas, Vol. 19, Issue 2
    • DOI: 10.1063/1.3685698

    Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities
    journal, April 2014

    • Fulton, D. P.; Lin, Z.; Holod, I.
    • Physics of Plasmas, Vol. 21, Issue 4
    • DOI: 10.1063/1.4871387

    Kinetic theory of tearing instability
    journal, January 1975

    • Hazeltine, R. D.; Dobrott, D.; Wang, T. S.
    • Physics of Fluids, Vol. 18, Issue 12
    • DOI: 10.1063/1.861097

    General theory of kinetic ballooning modes
    journal, January 1980

    • Frieman, E. A.; Rewoldt, G.; Tang, W. M.
    • Physics of Fluids, Vol. 23, Issue 9
    • DOI: 10.1063/1.863201

    Collisionless electron temperature gradient instability
    journal, January 1987

    • Lee, Y. C.; Dong, J. Q.; Guzdar, P. N.
    • Physics of Fluids, Vol. 30, Issue 5
    • DOI: 10.1063/1.866248

    Comparisons and physics basis of tokamak transport models and turbulence simulations
    journal, March 2000

    • Dimits, A. M.; Bateman, G.; Beer, M. A.
    • Physics of Plasmas, Vol. 7, Issue 3
    • DOI: 10.1063/1.873896

    Electron temperature gradient driven turbulence
    journal, May 2000

    • Jenko, F.; Dorland, W.; Kotschenreuther, M.
    • Physics of Plasmas, Vol. 7, Issue 5
    • DOI: 10.1063/1.874014

    Trapped particles in toroidal magnetic systems
    journal, January 1971


    Tokamak transport code simulations with drift wave models
    journal, January 1987


    Linear gyrokinetic analysis of a DIII-D H-mode pedestal near the ideal ballooning threshold
    journal, September 2012


    Edge microstability of NSTX plasmas without and with lithium-coated plasma-facing components
    journal, September 2013


    Progress in simulating turbulent electron thermal transport in NSTX
    journal, August 2013


    Overview of gyrokinetic studies of finite- β microturbulence
    journal, June 2015


    Gyrokinetic study of ASDEX Upgrade inter-ELM pedestal profile evolution
    journal, May 2015


    Microturbulence in DIII-D tokamak pedestal. II. Electromagnetic instabilities
    journal, August 2015


    Variational formulation of the linear MHD stability of 3D plasmas with noninteracting hot electrons
    journal, June 1992


    A review of models for ELMs
    journal, February 1998


    The relationships between edge localized modes suppression, pedestal profiles and lithium wall coatings in NSTX
    journal, September 2011


    Stellarator turbulence at electron gyroradius scales
    journal, June 2002


    Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry
    dataset, January 2016

    • Coury, M.; Guttenfelder, W.; Mikkelsen, D.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1562034