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]

doi:10.1063/1.4999785

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 »« less

Authors:

Sung, Choongki ^[1]; Wang, G. ^[1]; Rhodes, Terry L. ^[1];

^[2]; Osborne, Thomas H. ^[2]; Ono, Makoto ^[3]; McKee, George R. ^[4]; Yan, Zheng ^[4]; Groebner, Richard J. ^[2]; Davis, Evan M. ^[5]; Zeng, Lei ^[1]; Peebles, Williams A. ^[1];

^[2]

Univ. of California, Los Angeles, CA (United States)
General Atomics, San Diego, CA (United States)
National Institutes for Quantum and Radiological Science and Technology, Chiba (Japan)
Univ. of Wisconsin, Madison, WI (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Publication Date:: 2017-11-16

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.

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                    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.

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                    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.

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@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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DOI: 10.1063/1.4999785

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Abstract

Citation Formats

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

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

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

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

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Profile stiffness and global confinement journal, July 2004

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

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

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

Reconstruction of current profile parameters and plasma shapes in tokamaks
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