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Title: Increased electron temperature turbulence during suppression of edge localized mode by resonant magnetic perturbations in the DIII-D tokamak [Increased electron temperature turbulence during edge localized mode (ELM) suppression by resonant magnetic perturbations (RMPs) in the DIII-D tokamak]

Abstract

We report the first observation of increased edge electron temperature turbulence correlated with changes in gradients and the ELM suppression time which occurs after the application of resonant magnetic perturbations (RMP) on DIII-D H-mode plasmas. This increase (T ~ e/T e approximately doubles) occurs in the region extending from the top of the pedestal outward to the upper part of the edge steep gradient region. This is significant as it is consistent with increased turbulence driven transport potentially replacing some part of the edge localized mode (ELM) driven transport. However, temperature turbulence does not change with the initial RMP application while ELMs are still present, indicating the turbulence changes are not causative in the development of ELM suppression or initial profile evolution with RMP – but rather a response to these effects. This temperature turbulence is broadband and long wavelength, k θρ s < 0.5, where k θ = poloidal wavenumber, ρ s = ion sound gyroradius. As has been reported previously, long wavelength density turbulence (k θρ s < 1.0) in the same location also increases after ELMs were suppressed by the RMP. Since the decrease of the density starts nearly immediately with RMP application, these results suggest thatmore » the so-called RMP “density pump-out” is not linked to these long wavelength turbulent transport changes. Comparison with linear stability analysis finds both consistencies and inconsistencies in this important region.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [2];  [2];  [3];  [4];  [4];  [2];  [5];  [1];  [1]; ORCiD logo [2]
  1. Univ. of California, Los Angeles, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. National Institutes for Quantum and Radiological Science and Technology, Chiba (Japan)
  4. Univ. of Wisconsin, Madison, WI (United States)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1409224
Alternate Identifier(s):
OSTI ID: 1420641
Grant/Contract Number:  
FC02-04ER54698; FG02-08ER54984
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 11; 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

Citation Formats

Sung, Choongki, Wang, G., Rhodes, Terry L., Smith, Sterling P., Osborne, Thomas H., Ono, Makoto, McKee, George R., Yan, Zheng, Groebner, Richard J., Davis, Evan M., Zeng, Lei, Peebles, Williams A., and Evans, Todd E. Increased electron temperature turbulence during suppression of edge localized mode by resonant magnetic perturbations in the DIII-D tokamak [Increased electron temperature turbulence during edge localized mode (ELM) suppression by resonant magnetic perturbations (RMPs) in the DIII-D tokamak]. United States: N. p., 2017. Web. doi:10.1063/1.4999785.
Sung, Choongki, Wang, G., Rhodes, Terry L., Smith, Sterling P., Osborne, Thomas H., Ono, Makoto, McKee, George R., Yan, Zheng, Groebner, Richard J., Davis, Evan M., Zeng, Lei, Peebles, Williams A., & Evans, Todd E. Increased electron temperature turbulence during suppression of edge localized mode by resonant magnetic perturbations in the DIII-D tokamak [Increased electron temperature turbulence during edge localized mode (ELM) suppression by resonant magnetic perturbations (RMPs) in the DIII-D tokamak]. United States. doi:10.1063/1.4999785.
Sung, Choongki, Wang, G., Rhodes, Terry L., Smith, Sterling P., Osborne, Thomas H., Ono, Makoto, McKee, George R., Yan, Zheng, Groebner, Richard J., Davis, Evan M., Zeng, Lei, Peebles, Williams A., and Evans, Todd E. Thu . "Increased electron temperature turbulence during suppression of edge localized mode by resonant magnetic perturbations in the DIII-D tokamak [Increased electron temperature turbulence during edge localized mode (ELM) suppression by resonant magnetic perturbations (RMPs) in the DIII-D tokamak]". United States. doi:10.1063/1.4999785. https://www.osti.gov/servlets/purl/1409224.
@article{osti_1409224,
title = {Increased electron temperature turbulence during suppression of edge localized mode by resonant magnetic perturbations in the DIII-D tokamak [Increased electron temperature turbulence during edge localized mode (ELM) suppression by resonant magnetic perturbations (RMPs) in the DIII-D tokamak]},
author = {Sung, Choongki and Wang, G. and Rhodes, Terry L. and Smith, Sterling P. and Osborne, Thomas H. and Ono, Makoto and McKee, George R. and Yan, Zheng and Groebner, Richard J. and Davis, Evan M. and Zeng, Lei and Peebles, Williams A. and Evans, Todd E.},
abstractNote = {We report the first observation of increased edge electron temperature turbulence correlated with changes in gradients and the ELM suppression time which occurs after the application of resonant magnetic perturbations (RMP) on DIII-D H-mode plasmas. This increase (T~e/Te approximately doubles) occurs in the region extending from the top of the pedestal outward to the upper part of the edge steep gradient region. This is significant as it is consistent with increased turbulence driven transport potentially replacing some part of the edge localized mode (ELM) driven transport. However, temperature turbulence does not change with the initial RMP application while ELMs are still present, indicating the turbulence changes are not causative in the development of ELM suppression or initial profile evolution with RMP – but rather a response to these effects. This temperature turbulence is broadband and long wavelength, kθρs < 0.5, where kθ = poloidal wavenumber, ρs = ion sound gyroradius. As has been reported previously, long wavelength density turbulence (kθρs < 1.0) in the same location also increases after ELMs were suppressed by the RMP. Since the decrease of the density starts nearly immediately with RMP application, these results suggest that the so-called RMP “density pump-out” is not linked to these long wavelength turbulent transport changes. Comparison with linear stability analysis finds both consistencies and inconsistencies in this important region.},
doi = {10.1063/1.4999785},
journal = {Physics of Plasmas},
number = 11,
volume = 24,
place = {United States},
year = {2017},
month = {11}
}

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Works referenced in this record:

Reconstruction of current profile parameters and plasma shapes in tokamaks
journal, November 1985


Measurements of edge-localized-mode induced electron cyclotron emission bursts in DIII-D
journal, May 2001

  • Fuchs, Ch.; Austin, M. E.
  • Physics of Plasmas, Vol. 8, Issue 5
  • DOI: 10.1063/1.1362527

Nonlinear Interaction of Edge-Localized Modes and Turbulent Eddies in Toroidal Plasma under n = 1 Magnetic Perturbation
journal, August 2016


Progress on the application of ELM control schemes to ITER scenarios from the non-active phase to DT operation
journal, February 2014


Nonlinear drift waves and transport in magnetized plasma
journal, August 1990


Plasma Turbulence Imaging via Beam Emission Spectroscopy in the Core of the DIII-D Tokamak
journal, January 2007

  • McKEE, George R.; Fonck, Raymond J.; Gupta, Deepak K.
  • Plasma and Fusion Research, Vol. 2
  • DOI: 10.1585/pfr.2.S1025

A high-accuracy Eulerian gyrokinetic solver for collisional plasmas
journal, November 2016


Edge localized mode control with an edge resonant magnetic perturbation
journal, May 2005

  • Moyer, R. A.; Evans, T. E.; Osborne, T. H.
  • Physics of Plasmas, Vol. 12, Issue 5
  • DOI: 10.1063/1.1888705

Progress in quantifying the edge physics of the H mode regime in DIII-D
journal, December 2001


Increase of turbulence and transport with resonant magnetic perturbations in ELM-suppressed plasmas on DIII-D
journal, September 2013


Profile stiffness and global confinement
journal, July 2004


ELM control experiments in the KSTAR device
journal, October 2012


Changes in density fluctuations as a result of resonant magnetic perturbations correlate with the density inverse scale length
journal, February 2012

  • Mordijck, S.; Moyer, R. A.; McKee, G. R.
  • Physics of Plasmas, Vol. 19, Issue 2
  • DOI: 10.1063/1.3680641

Core temperature fluctuations and related heat transport in the Texas Experimental Tokamak‐Upgrade
journal, March 1995

  • Cima, G.; Bravenec, R. V.; Wootton, A. J.
  • Physics of Plasmas, Vol. 2, Issue 3
  • DOI: 10.1063/1.871423

First Observation of Edge Localized Modes Mitigation with Resonant and Nonresonant Magnetic Perturbations in ASDEX Upgrade
journal, June 2011


RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities
journal, January 2008


A correlation electron cyclotron emission diagnostic and the importance of multifield fluctuation measurements for testing nonlinear gyrokinetic turbulence simulations
journal, October 2008

  • White, A. E.; Schmitz, L.; Peebles, W. A.
  • Review of Scientific Instruments, Vol. 79, Issue 10
  • DOI: 10.1063/1.2981186

Changes in particle transport as a result of resonant magnetic perturbations in DIII-D
journal, May 2012

  • Mordijck, S.; Doyle, E. J.; McKee, G. R.
  • Physics of Plasmas, Vol. 19, Issue 5
  • DOI: 10.1063/1.4718316

Evidence of Toroidally Localized Turbulence with Applied 3D Fields in the DIII-D Tokamak
journal, September 2016


Resistive wall mode stabilization with internal feedback coils in DIII-D
journal, May 2004

  • Strait, E. J.; Bialek, J. M.; Bogatu, I. N.
  • Physics of Plasmas, Vol. 11, Issue 5
  • DOI: 10.1063/1.1666238

Density fluctuation effects on electron cyclotron emission correlation measurements in optically gray plasmas
journal, June 1994

  • Rempel, T. D.; Gandy, R. F.; Wootton, A. J.
  • Review of Scientific Instruments, Vol. 65, Issue 6
  • DOI: 10.1063/1.1144810

Edge stability and transport control with resonant magnetic perturbations in collisionless tokamak plasmas
journal, May 2006

  • Evans, Todd E.; Moyer, Richard A.; Burrell, Keith H.
  • Nature Physics, Vol. 2, Issue 6
  • DOI: 10.1038/nphys312

Ion temperature gradient turbulence simulations and plasma flux surface shape
journal, November 1999

  • Waltz, R. E.; Miller, R. L.
  • Physics of Plasmas, Vol. 6, Issue 11
  • DOI: 10.1063/1.873694

Comparison of resonant magnetic perturbation-induced particle transport changes in H-mode (DIII-D) and L-mode (MAST)
journal, November 2011


Characteristics of type I ELM energy and particle losses in existing devices and their extrapolation to ITER
journal, August 2003


Noncircular, finite aspect ratio, local equilibrium model
journal, April 1998

  • Miller, R. L.; Chu, M. S.; Greene, J. M.
  • Physics of Plasmas, Vol. 5, Issue 4
  • DOI: 10.1063/1.872666

Enhanced sensitivity beam emission spectroscopy system for nonlinear turbulence measurements
journal, October 2004

  • Gupta, Deepak K.; Fonck, Raymond J.; McKee, George R.
  • Review of Scientific Instruments, Vol. 75, Issue 10
  • DOI: 10.1063/1.1787951

Pedestal Bifurcation and Resonant Field Penetration at the Threshold of Edge-Localized Mode Suppression in the DIII-D Tokamak
journal, March 2015


Parametric dependence of the edge radial electric field in the DIII-D tokamak
journal, January 1998