Effects of RMP-induced changes of radial electric fields on microturbulence in DIII-D pedestal top

Taimourzadeh, Sam; Shi, Lei; Lin, Zhihong; Nazikian, Raffi; Holod, Ihor; Spong, Donald A.

doi:10.1088/1741-4326/aafe3a

Title: Effects of RMP-induced changes of radial electric fields on microturbulence in DIII-D pedestal top

Abstract

Gyrokinetic simulations of DIII-D tokamak with axisymmetric equilibrium show that the reduction in the radial electric field shear at the top of the pedestal during edge localized mode (ELM) suppression with the n = 2 resonant magnetic perturbations (RMPs) leads to enhanced drift-wave turbulence and extended turbulence spreading to the top of the pedestal relative to ELMing plasmas with similar RMP and pedestal parameters. The simulated turbulent transport at the top of the pedestal in ELM suppressed conditions is consistent with experimental observations of enhanced turbulence at the top of the pedestal during ELM suppression by the RMPs. Furthermore, these results suggest that enhanced drift-wave turbulence due to reduced E × B shear at the pedestal top can contribute to the additional transport required to prevent the pedestal growing to a width that is unstable to ELMs.

Authors:

Taimourzadeh, Sam ^[1]; Shi, Lei ^[1]; Lin, Zhihong ^[1]; Nazikian, Raffi ^[2]; Holod, Ihor ^[3];

^[4]

Univ. of California, Irvine, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Mon Jan 14 00:00:00 EST 2019

Research Org.:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI Identifier:: 1492930

Alternate Identifier(s):: OSTI ID: 1648970

Grant/Contract Number:: FC02-04ER54698; SC0013804; AC02-09CH11466; AC52-07NA27344; AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Fusion

Additional Journal Information:: Journal Volume: 59; Journal Issue: 4; Journal ID: ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; RMP turbulence; E x B shear; edge localized modes; resonant magnetic pertubations; DIII-D; gyrokinetic simulations; plasma

Citation Formats


                    Taimourzadeh, Sam, Shi, Lei, Lin, Zhihong, Nazikian, Raffi, Holod, Ihor, and Spong, Donald A. Effects of RMP-induced changes of radial electric fields on microturbulence in DIII-D pedestal top.  United States: N. p., 2019. 
Web.  doi:10.1088/1741-4326/aafe3a.

Copy to clipboard


                    Taimourzadeh, Sam, Shi, Lei, Lin, Zhihong, Nazikian, Raffi, Holod, Ihor, & Spong, Donald A. Effects of RMP-induced changes of radial electric fields on microturbulence in DIII-D pedestal top.  United States.  https://doi.org/10.1088/1741-4326/aafe3a

Copy to clipboard


                    Taimourzadeh, Sam, Shi, Lei, Lin, Zhihong, Nazikian, Raffi, Holod, Ihor, and Spong, Donald A. Mon .  
"Effects of RMP-induced changes of radial electric fields on microturbulence in DIII-D pedestal top".  United States.  https://doi.org/10.1088/1741-4326/aafe3a.  https://www.osti.gov/servlets/purl/1492930.

Copy to clipboard


                    
@article{osti_1492930,

  title        = {Effects of RMP-induced changes of radial electric fields on microturbulence in DIII-D pedestal top},

  author       = {Taimourzadeh, Sam and Shi, Lei and Lin, Zhihong and Nazikian, Raffi and Holod, Ihor and Spong, Donald A.},

  abstractNote = {Gyrokinetic simulations of DIII-D tokamak with axisymmetric equilibrium show that the reduction in the radial electric field shear at the top of the pedestal during edge localized mode (ELM) suppression with the n = 2 resonant magnetic perturbations (RMPs) leads to enhanced drift-wave turbulence and extended turbulence spreading to the top of the pedestal relative to ELMing plasmas with similar RMP and pedestal parameters. The simulated turbulent transport at the top of the pedestal in ELM suppressed conditions is consistent with experimental observations of enhanced turbulence at the top of the pedestal during ELM suppression by the RMPs. Furthermore, these results suggest that enhanced drift-wave turbulence due to reduced E × B shear at the pedestal top can contribute to the additional transport required to prevent the pedestal growing to a width that is unstable to ELMs.},

  doi          = {10.1088/1741-4326/aafe3a},

  journal      = {Nuclear Fusion},

  number       = 4,

  volume       = 59,

  place        = {United States},

  year         = {Mon Jan 14 00:00:00 EST 2019},

  month        = {Mon Jan 14 00:00:00 EST 2019}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1088/1741-4326/aafe3a

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 21 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations
journal, July 2012

Jeon, Y. M.; Park, J. -K.; Yoon, S. W.
Physical Review Letters, Vol. 109, Issue 3
DOI: 10.1103/PhysRevLett.109.035004

Global gyrokinetic particle simulations with kinetic electrons
journal, November 2007

Lin, Z.; Nishimura, Y.; Xiao, Y.
Plasma Physics and Controlled Fusion, Vol. 49, Issue 12B
DOI: 10.1088/0741-3335/49/12B/S15

Turbulence spreading and transport scaling in global gyrokinetic particle simulations
journal, March 2004

Lin, Z.; Hahm, T. S.
Physics of Plasmas, Vol. 11, Issue 3
DOI: 10.1063/1.1647136

Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary
journal, March 2005

Evans, T. E.; Moyer, R. A.; Watkins, J. G.
Journal of Nuclear Materials, Vol. 337-339
DOI: 10.1016/j.jnucmat.2004.10.062

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

Gyrokinetic approach in particle simulation
journal, January 1983

Lee, W. W.
Physics of Fluids, Vol. 26, Issue 2
DOI: 10.1063/1.864140

Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D
journal, January 2015

Wade, M. R.; Nazikian, R.; deGrassie, J. S.
Nuclear Fusion, Vol. 55, Issue 2
DOI: 10.1088/0029-5515/55/2/023002

Foundations of nonlinear gyrokinetic theory
journal, April 2007

Brizard, A. J.; Hahm, T. S.
Reviews of Modern Physics, Vol. 79, Issue 2
DOI: 10.1103/RevModPhys.79.421

Verification of electromagnetic fluid-kinetic hybrid electron model in global gyrokinetic particle simulation
journal, March 2013

Holod, I.; Lin, Z.
Physics of Plasmas, Vol. 20, Issue 3
DOI: 10.1063/1.4798392

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

McKee, G. R.; Yan, Z.; Holland, C.
Nuclear Fusion, Vol. 53, Issue 11
DOI: 10.1088/0029-5515/53/11/113011

A conservative scheme of drift kinetic electrons for gyrokinetic simulation of kinetic-MHD processes in toroidal plasmas
journal, October 2017

Bao, J.; Liu, D.; Lin, Z.
Physics of Plasmas, Vol. 24, Issue 10
DOI: 10.1063/1.4995455

Microturbulence in DIII-D tokamak pedestal. III. Effects of collisions
journal, December 2016

Liao, X.; Lin, Z.; Holod, I.
Physics of Plasmas, Vol. 23, Issue 12
DOI: 10.1063/1.4972079

Edge-Localized Mode Control and Transport Generated by Externally Applied Magnetic Perturbations
journal, June 2012

Joseph, I.
Contributions to Plasma Physics, Vol. 52, Issue 5-6
DOI: 10.1002/ctpp.201210014

Validation of the model for ELM suppression with 3D magnetic fields using low torque ITER baseline scenario discharges in DIII-D
journal, October 2017

Moyer, R. A.; Paz-Soldan, C.; Nazikian, R.
Physics of Plasmas, Vol. 24, Issue 10
DOI: 10.1063/1.5000276

Gyrokinetic particle simulation model
journal, September 1987

Lee, W. W.
Journal of Computational Physics, Vol. 72, Issue 1
DOI: 10.1016/0021-9991(87)90080-5

Steepest-descent moment method for three-dimensional magnetohydrodynamic equilibria
journal, January 1983

Hirshman, S. P.
Physics of Fluids, Vol. 26, Issue 12
DOI: 10.1063/1.864116

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

Suttrop, W.; Eich, T.; Fuchs, J. C.
Physical Review Letters, Vol. 106, Issue 22
DOI: 10.1103/PhysRevLett.106.225004

Active Control of Type-I Edge-Localized Modes with $n = 1$ Perturbation Fields in the JET Tokamak
journal, June 2007

Liang, Y.; Koslowski, H. R.; Thomas, P. R.
Physical Review Letters, Vol. 98, Issue 26
DOI: 10.1103/PhysRevLett.98.265004

Turbulent Transport Reduction by Zonal Flows: Massively Parallel Simulations
journal, September 1998

Lin, Z.
Science, Vol. 281, Issue 5384
DOI: 10.1126/science.281.5384.1835

Drift waves and transport
journal, April 1999

Horton, W.
Reviews of Modern Physics, Vol. 71, Issue 3
DOI: 10.1103/RevModPhys.71.735

Gyrokinetic particle simulation of microturbulence for general magnetic geometry and experimental profiles
journal, February 2015

Xiao, Yong; Holod, Ihor; Wang, Zhixuan
Physics of Plasmas, Vol. 22, Issue 2
DOI: 10.1063/1.4908275

Observation of Plasma Toroidal-Momentum Dissipation by Neoclassical Toroidal Viscosity
journal, June 2006

Zhu, W.; Sabbagh, S. A.; Bell, R. E.
Physical Review Letters, Vol. 96, Issue 22
DOI: 10.1103/PhysRevLett.96.225002

Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices
journal, May 1997

Burrell, K. H.
Physics of Plasmas, Vol. 4, Issue 5
DOI: 10.1063/1.872367

Microturbulence in DIII-D tokamak pedestal. IV. Electrostatic turbulent transport
journal, December 2016

Liao, X.; Lin, Z.; Holod, I.
Physics of Plasmas, Vol. 23, Issue 12
DOI: 10.1063/1.4972080

Works referencing / citing this record:

Kinetic particle simulations in a global toroidal geometry
journal, August 2019

De, S.; Singh, T.; Kuley, A.
Physics of Plasmas, Vol. 26, Issue 8
DOI: 10.1063/1.5108684

The density dependence of edge-localized-mode suppression and pump-out by resonant magnetic perturbations in the DIII-D tokamak
journal, December 2019

Hu, Q. M.; Nazikian, R.; Grierson, B. A.
Physics of Plasmas, Vol. 26, Issue 12
DOI: 10.1063/1.5134767

The effect of plasma shape and neutral beam mix on the rotation threshold for RMP-ELM suppression
journal, March 2019

Paz-Soldan, C.; Nazikian, R.; Cui, L.
Nuclear Fusion, Vol. 59, Issue 5
DOI: 10.1088/1741-4326/ab04c0

Similar Records in DOE PAGES and OSTI.GOV collections:

Effects of resonant magnetic perturbations on radial electric fields in DIII-D tokamak

Journal Article Fu, Jingyuan ; Liu, Pengfei ; Wei, Xishuo ; ... - Plasma Science and Technology

Here, gyrokinetic simulations of DIII-D tokamak equilibrium find that resonant magnetic perturbation (RMP) drives a neoclassical non-ambipolar electron particle flux, which causes a rapid change of equilibrium radial electric fields consistent with experimental observations during the suppression of the edge localized mode (ELM). The simulation results provide a support for the conjecture that RMP-induced changes of radial electric fields lead to the enhanced turbulent transport at the pedestal top during the ELM suppression (Taimourzadeh et al 2019 Nucl. Fusion 59 046005). Furthermore, gyrokinetic simulations of collisionless damping of zonal flows show that resonant responses to the RMP decrease the residualmore »« less
https://doi.org/10.1088/2058-6272/ac190e

Full Text Available
Advances in the Understanding of ELM Suppression by Resonant Magnetic Perturbations (RMPs) in DIII-D and Implications for ITER

Conference Nazikian, R. - 25th IAEA Fusion Energy Conference Proceedings on IAEA Physics website

Experiments on DIII-D have expanding the operating window for RMP ELM suppression to higher q95 with dominant electron heating and fully non-inductive current drive relevant to advanced modes of ITER operation. Robust ELM suppression has also been obtained with a reduced coil set, mitigating the risk of coil failure in maintaining ELM suppression in ITER. These results significantly expand the operating space and reduce risk for obtaining RMP ELM suppression in ITER. Efforts have also been made to search for 3D cause of ELM suppression. No internal non-axisymmetric structure is detected at the top of the pedestal, indicating that themore »« less
Full Text Available
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]

Journal Article Sung, Choongki ; Wang, G. ; Rhodes, Terry L. ; ... - Physics of Plasmas

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 aremore »« less
Cited by 16
https://doi.org/10.1063/1.4999785

Full Text Available
The role of edge resonant magnetic perturbations in edge-localized-mode suppression and density pump-out in low-collisionality DIII-D plasmas

Journal Article Hu, Q. M. ; Nazikian, R. ; Grierson, B. A. ; ... - Nuclear Fusion

Two-fluid nonlinear MHD simulations using the TM1 code demonstrate that the formation of magnetic islands at the top and bottom of the H-mode pedestal, together with the strong screening of resonant fields in the gradient region of the pedestal, can account for ELM suppression and density pump-out by n = 2 resonant magnetic perturbations (RMPs) in low-collisionality DIII-D ITER similar shape (ISS) plasmas. Using experimentally relevant transport coefficients, neoclassical resistivity, electron collisionality, and RMP amplitudes, nonlinear MHD simulations reproduce the observed level of density reduction (density pump-out) in DIII-D due to the formation of narrow magnetic islands in the resistivemore »« less
Cited by 36
https://doi.org/10.1088/1741-4326/ab8545

Full Text Available
Pedestal collapse by resonant magnetic perturbations

Journal Article Nazikian, R. ; Hu, Q. ; Ashourvan, A. ; ... - Nuclear Fusion

Pedestal collapse (i.e., the complete loss of the edge transport barrier (ETB)) in DIII-D H-mode plasmas occurs when resonant magnetic perturbations (RMPs) penetrate the steep gradient region at the plasma edge. Normally, RMP driven magnetic islands can occur at the top and bottom of the H-mode pedestal and these islands generate conditions consistent with edge-localized-mode (ELM) suppression and density pump-out, respectively, based on nonlinear two-fluid MHD simulations. In contrast, MHD simulations show that the steep pressure gradient region between the top and bottom of the DIII-D pedestal is generally immune to resonant field penetration due to large local E ×more »« less
https://doi.org/10.1088/1741-4326/abd863

Full Text Available

Similar Records

Title: Effects of RMP-induced changes of radial electric fields on microturbulence in DIII-D pedestal top

Abstract

Citation Formats

Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations journal, July 2012

Global gyrokinetic particle simulations with kinetic electrons journal, November 2007

Turbulence spreading and transport scaling in global gyrokinetic particle simulations journal, March 2004

Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary journal, March 2005

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

Gyrokinetic approach in particle simulation journal, January 1983

Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D journal, January 2015

Foundations of nonlinear gyrokinetic theory journal, April 2007

Verification of electromagnetic fluid-kinetic hybrid electron model in global gyrokinetic particle simulation journal, March 2013

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

A conservative scheme of drift kinetic electrons for gyrokinetic simulation of kinetic-MHD processes in toroidal plasmas journal, October 2017

Microturbulence in DIII-D tokamak pedestal. III. Effects of collisions journal, December 2016

Edge-Localized Mode Control and Transport Generated by Externally Applied Magnetic Perturbations journal, June 2012

Validation of the model for ELM suppression with 3D magnetic fields using low torque ITER baseline scenario discharges in DIII-D journal, October 2017

Gyrokinetic particle simulation model journal, September 1987

Steepest-descent moment method for three-dimensional magnetohydrodynamic equilibria journal, January 1983

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

Active Control of Type-I Edge-Localized Modes with n = 1 Perturbation Fields in the JET Tokamak journal, June 2007

Turbulent Transport Reduction by Zonal Flows: Massively Parallel Simulations journal, September 1998

Drift waves and transport journal, April 1999

Gyrokinetic particle simulation of microturbulence for general magnetic geometry and experimental profiles journal, February 2015

Observation of Plasma Toroidal-Momentum Dissipation by Neoclassical Toroidal Viscosity journal, June 2006

Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices journal, May 1997

Microturbulence in DIII-D tokamak pedestal. IV. Electrostatic turbulent transport journal, December 2016

Kinetic particle simulations in a global toroidal geometry journal, August 2019

The density dependence of edge-localized-mode suppression and pump-out by resonant magnetic perturbations in the DIII-D tokamak journal, December 2019

The effect of plasma shape and neutral beam mix on the rotation threshold for RMP-ELM suppression journal, March 2019

Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations
journal, July 2012

Global gyrokinetic particle simulations with kinetic electrons
journal, November 2007

Turbulence spreading and transport scaling in global gyrokinetic particle simulations
journal, March 2004

Suppression of large edge localized modes in high confinement DIII-D plasmas with a stochastic magnetic boundary
journal, March 2005

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

Gyrokinetic approach in particle simulation
journal, January 1983

Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D
journal, January 2015

Foundations of nonlinear gyrokinetic theory
journal, April 2007

Verification of electromagnetic fluid-kinetic hybrid electron model in global gyrokinetic particle simulation
journal, March 2013

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

A conservative scheme of drift kinetic electrons for gyrokinetic simulation of kinetic-MHD processes in toroidal plasmas
journal, October 2017

Microturbulence in DIII-D tokamak pedestal. III. Effects of collisions
journal, December 2016

Edge-Localized Mode Control and Transport Generated by Externally Applied Magnetic Perturbations
journal, June 2012

Validation of the model for ELM suppression with 3D magnetic fields using low torque ITER baseline scenario discharges in DIII-D
journal, October 2017

Gyrokinetic particle simulation model
journal, September 1987

Steepest-descent moment method for three-dimensional magnetohydrodynamic equilibria
journal, January 1983

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

Active Control of Type-I Edge-Localized Modes with $n = 1$ Perturbation Fields in the JET Tokamak
journal, June 2007

Turbulent Transport Reduction by Zonal Flows: Massively Parallel Simulations
journal, September 1998

Drift waves and transport
journal, April 1999

Gyrokinetic particle simulation of microturbulence for general magnetic geometry and experimental profiles
journal, February 2015

Observation of Plasma Toroidal-Momentum Dissipation by Neoclassical Toroidal Viscosity
journal, June 2006

Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices
journal, May 1997

Microturbulence in DIII-D tokamak pedestal. IV. Electrostatic turbulent transport
journal, December 2016

Kinetic particle simulations in a global toroidal geometry
journal, August 2019

The density dependence of edge-localized-mode suppression and pump-out by resonant magnetic perturbations in the DIII-D tokamak
journal, December 2019

The effect of plasma shape and neutral beam mix on the rotation threshold for RMP-ELM suppression
journal, March 2019