The role of edge resonant magnetic perturbations in edge-localized-mode suppression and density pump-out in low-collisionality DIII-D plasmas
Abstract
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 resistive foot of pedestal. For large amplitude RMPs (B r/B t > 1×10-4) simulations predict resonant field penetration and resulting in pressure reduction at the top of the pedestal, consistent with experimental observations at the onset of ELM suppression. The predicted reduction in the height and width of the pedestal by magnetic island enhanced collisional transport provides a quantitative mechanism for the stabilization of the peeling-ballooning mode (PBM). Importantly, these simulations predict strong screening of resonant fields in the steep gradient region of the pedestal due to strong E×B rotation and diamagnetic flows. Yet, if the plasma resistivity is made artificiallymore »
- Authors:
-
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- General Atomics, San Diego, CA (United States)
- Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States); Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1631030
- Alternate Identifier(s):
- OSTI ID: 1630971
- Grant/Contract Number:
- FC02-04ER54698; AC02-09CH11466; FOA-0001386; SC0015878; DESC0015878
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 7; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELM suppression; resonant magnetic perturbations; density pump-out; resonant field penetration
Citation Formats
Hu, Q. M., Nazikian, R., Grierson, B. A., Logan, N. C., Paz-Soldan, C., and Yu, Q. The role of edge resonant magnetic perturbations in edge-localized-mode suppression and density pump-out in low-collisionality DIII-D plasmas. United States: N. p., 2020.
Web. doi:10.1088/1741-4326/ab8545.
Hu, Q. M., Nazikian, R., Grierson, B. A., Logan, N. C., Paz-Soldan, C., & Yu, Q. The role of edge resonant magnetic perturbations in edge-localized-mode suppression and density pump-out in low-collisionality DIII-D plasmas. United States. https://doi.org/10.1088/1741-4326/ab8545
Hu, Q. M., Nazikian, R., Grierson, B. A., Logan, N. C., Paz-Soldan, C., and Yu, Q. Mon .
"The role of edge resonant magnetic perturbations in edge-localized-mode suppression and density pump-out in low-collisionality DIII-D plasmas". United States. https://doi.org/10.1088/1741-4326/ab8545. https://www.osti.gov/servlets/purl/1631030.
@article{osti_1631030,
title = {The role of edge resonant magnetic perturbations in edge-localized-mode suppression and density pump-out in low-collisionality DIII-D plasmas},
author = {Hu, Q. M. and Nazikian, R. and Grierson, B. A. and Logan, N. C. and Paz-Soldan, C. and Yu, Q.},
abstractNote = {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 resistive foot of pedestal. For large amplitude RMPs (B r/B t > 1×10-4) simulations predict resonant field penetration and resulting in pressure reduction at the top of the pedestal, consistent with experimental observations at the onset of ELM suppression. The predicted reduction in the height and width of the pedestal by magnetic island enhanced collisional transport provides a quantitative mechanism for the stabilization of the peeling-ballooning mode (PBM). Importantly, these simulations predict strong screening of resonant fields in the steep gradient region of the pedestal due to strong E×B rotation and diamagnetic flows. Yet, if the plasma resistivity is made artificially larger (~ 10X) than neoclassical, the simulations predict magnetic stochasticity throughout the plasma edge and the collapse of the pedestal due to the reduction in the penetration threshold with increasing resistivity. A scaling relation for resonant field penetration at the pedestal top, using several hundred nonlinear simulations, reproduces the density and E×B rotation dependence of the ELM suppression threshold observed in DIII-D. Simulations using ITER model equilibria indicate that the penetration threshold at the top of the ITER pedestal will be lower than in DIII-D due to the anticipated lower perpendicular flow velocities in ITER, resulting in the weaker screening of resonant fields.},
doi = {10.1088/1741-4326/ab8545},
journal = {Nuclear Fusion},
number = 7,
volume = 60,
place = {United States},
year = {Mon May 25 00:00:00 EDT 2020},
month = {Mon May 25 00:00:00 EDT 2020}
}
Web of Science
Works referenced in this record:
Computation of three-dimensional tokamak and spherical torus equilibria
journal, May 2007
- Park, Jong-kyu; Boozer, Allen H.; Glasser, Alan H.
- Physics of Plasmas, Vol. 14, Issue 5
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
Effect of resonant magnetic perturbations on COMPASS-C tokamak discharges
journal, December 1992
- Hender, T. C.; Fitzpatrick, R.; Morris, A. W.
- Nuclear Fusion, Vol. 32, Issue 12
Nonlinear instability to low m,n=1 error fields in DIII-D as a function of plasma fluid rotation and beta
journal, December 1992
- Haye, R. J. La; Hyatt, A. W.; Scoville, J. T.
- Nuclear Fusion, Vol. 32, Issue 12
Improved edge charge exchange recombination spectroscopy in DIII-D
journal, August 2016
- Chrystal, C.; Burrell, K. H.; Grierson, B. A.
- Review of Scientific Instruments, Vol. 87, Issue 11
Non-linear modeling of the plasma response to RMPs in ASDEX Upgrade
journal, September 2016
- Orain, F.; Hölzl, M.; Viezzer, E.
- Nuclear Fusion, Vol. 57, Issue 2
Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
journal, July 1999
- Sauter, O.; Angioni, C.; Lin-Liu, Y. R.
- Physics of Plasmas, Vol. 6, Issue 7
Gyrokinetic study of collisional resonant magnetic perturbation (RMP)-driven plasma density and heat transport in tokamak edge plasma using a magnetohydrodynamic screened RMP field
journal, September 2019
- Hager, Robert; Chang, C. S.; Ferraro, N. M.
- Nuclear Fusion, Vol. 59, Issue 12
Calculations of two-fluid linear response to non-axisymmetric fields in tokamaks
journal, May 2012
- Ferraro, N. M.
- Physics of Plasmas, Vol. 19, Issue 5
The role of radial particle flow on power balance in DIII-D
journal, December 1998
- Porter, G. D.
- Physics of Plasmas, Vol. 5, Issue 12
An upgrade of the magnetic diagnostic system of the DIII-D tokamak for non-axisymmetric measurements
journal, August 2014
- King, J. D.; Strait, E. J.; Boivin, R. L.
- Review of Scientific Instruments, Vol. 85, Issue 8
Calculation of stochastic thermal transport due to resonant magnetic perturbations in DIII-D
journal, March 2008
- Joseph, I.; Evans, T. E.; Runov, A. M.
- Nuclear Fusion, Vol. 48, Issue 4
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
Experiments to test an intra-island scoop limiter on TEXT
journal, February 1987
- Evans, T. E.; DeGrassie, J. S.; Jackson, G. L.
- Journal of Nuclear Materials, Vol. 145-147
Main ion and impurity edge profile evolution across the L- to H-mode transition on DIII-D
journal, August 2018
- Haskey, S. R.; Grierson, B. A.; Chrystal, C.
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 10
Active Control of Type-I Edge-Localized Modes with Perturbation Fields in the JET Tokamak
journal, June 2007
- Liang, Y.; Koslowski, H. R.; Thomas, P. R.
- Physical Review Letters, Vol. 98, Issue 26
Resonant-magnetic-perturbation-induced plasma transport in H-mode pedestals
journal, November 2012
- Callen, J. D.; Cole, A. J.; Hegna, C. C.
- Physics of Plasmas, Vol. 19, Issue 11
Gyrokinetic simulations with external resonant magnetic perturbations: Island torque and nonambipolar transport with plasma rotation
journal, March 2012
- Waltz, R. E.; Waelbroeck, F. L.
- Physics of Plasmas, Vol. 19, Issue 3
Heat diffusion across a local stochastic magnetic field
journal, August 2007
- Yu, Q.
- Nuclear Fusion, Vol. 47, Issue 9
Observation of a Multimode Plasma Response and its Relationship to Density Pumpout and Edge-Localized Mode Suppression
journal, March 2015
- Paz-Soldan, C.; Nazikian, R.; Haskey, S. R.
- Physical Review Letters, Vol. 114, Issue 10
Pedestal Bifurcation and Resonant Field Penetration at the Threshold of Edge-Localized Mode Suppression in the DIII-D Tokamak
journal, March 2015
- Nazikian, R.; Paz-Soldan, C.; Callen, J. D.
- Physical Review Letters, Vol. 114, Issue 10
Integrated modeling applications for tokamak experiments with OMFIT
journal, July 2015
- Meneghini, O.; Smith, S. P.; Lao, L. L.
- Nuclear Fusion, Vol. 55, Issue 8
Plasma transport in stochastic magnetic field caused by vacuum resonant magnetic perturbations at diverted tokamak edge
journal, October 2010
- Park, G.; Chang, C. S.; Joseph, I.
- Physics of Plasmas, Vol. 17, Issue 10
Resonant magnetic perturbation experiments on MAST using external and internal coils for ELM control
journal, February 2010
- Kirk, A.; Nardon, E.; Akers, R.
- Nuclear Fusion, Vol. 50, Issue 3
Nonlinear Transition from Mitigation to Suppression of the Edge Localized Mode with Resonant Magnetic Perturbations in the EAST Tokamak
journal, September 2016
- Sun, Y.; Liang, Y.; Liu, Y. Q.
- Physical Review Letters, Vol. 117, Issue 11
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
Numerical modeling of diffusive heat transport across magnetic islands and local stochastic field
journal, June 2006
- Yu, Q.
- Physics of Plasmas, Vol. 13, Issue 6
Integrated Tokamak modeling: When physics informs engineering and research planning
journal, May 2018
- Poli, Francesca Maria
- Physics of Plasmas, Vol. 25, Issue 5
Mechanism of Edge Localized Mode Mitigation by Resonant Magnetic Perturbations
journal, September 2014
- Bécoulet, M.; Orain, F.; Huijsmans, G. T. A.
- Physical Review Letters, Vol. 113, Issue 11
Screening of resonant magnetic perturbations by flows in tokamaks
journal, May 2012
- Becoulet, M.; Orain, F.; Maget, P.
- Nuclear Fusion, Vol. 52, Issue 5
Error field optimization in DIII-D using extremum seeking control
journal, June 2016
- Lanctot, M. J.; Olofsson, K. E. J.; Capella, M.
- Nuclear Fusion, Vol. 56, Issue 7
Self-consistent perturbed equilibrium with neoclassical toroidal torque in tokamaks
journal, March 2017
- Park, Jong-Kyu; Logan, Nikolas C.
- Physics of Plasmas, Vol. 24, Issue 3
Sustained suppression of type-I edge-localized modes with dominantly n = 2 magnetic fields in DIII-D
journal, July 2013
- Lanctot, M. J.; Buttery, R. J.; de Grassie, J. S.
- Nuclear Fusion, Vol. 53, Issue 8
Impact of resonant magnetic perturbations on nonlinearly driven modes in drift-wave turbulence
journal, May 2012
- Leconte, M.; Diamond, P. H.
- Physics of Plasmas, Vol. 19, Issue 5
Experimental conditions to suppress edge localised modes by magnetic perturbations in the ASDEX Upgrade tokamak
journal, July 2018
- Suttrop, W.; Kirk, A.; Bobkov, V.
- Nuclear Fusion, Vol. 58, Issue 9
3D field phase-space control in tokamak plasmas
journal, September 2018
- Park, Jong-Kyu; Jeon, YoungMu; In, Yongkyoon
- Nature Physics, Vol. 14, Issue 12
The physics of edge resonant magnetic perturbations in hot tokamak plasmas
journal, May 2006
- Evans, T. E.; Burrell, K. H.; Fenstermacher, M. E.
- Physics of Plasmas, Vol. 13, Issue 5
Progress in quantifying the edge physics of the H mode regime in DIII-D
journal, December 2001
- Groebner, R. J.; Baker, D. R.; Burrell, K. H.
- Nuclear Fusion, Vol. 41, Issue 12
Density control in ITER: an iterative learning control and robust control approach
journal, December 2017
- Ravensbergen, T.; de Vries, P. C.; Felici, F.
- Nuclear Fusion, Vol. 58, Issue 1
The EPED pedestal model and edge localized mode-suppressed regimes: Studies of quiescent H-mode and development of a model for edge localized mode suppression via resonant magnetic perturbations
journal, May 2012
- Snyder, P. B.; Osborne, T. H.; Burrell, K. H.
- Physics of Plasmas, Vol. 19, Issue 5
Dependence of the threshold for perturbation field generated m / n = 2/1 tearing modes on the plasma fluid rotation
journal, July 2006
- Koslowski, H. R.; Liang, Y.; Krämer-Flecken, A.
- Nuclear Fusion, Vol. 46, Issue 8
Theory of edge localized mode suppression by static resonant magnetic perturbations in the DIII-D tokamak
journal, April 2020
- Fitzpatrick, Richard
- Physics of Plasmas, Vol. 27, Issue 4
Error field experiments in JET
journal, April 2000
- Buttery, R. J.; Benedetti, M. De'; Hender, T. C.
- Nuclear Fusion, Vol. 40, Issue 4
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
Modelling of heat transport in magnetised plasmas using non-aligned coordinates
journal, October 2005
- Günter, S.; Yu, Q.; Krüger, J.
- Journal of Computational Physics, Vol. 209, Issue 1
Critical error fields for locked mode instability in tokamaks
journal, March 1992
- La Haye, R. J.; Fitzpatrick, R.; Hender, T. C.
- Physics of Fluids B: Plasma Physics, Vol. 4, Issue 7
Role of singular layers in the plasma response to resonant magnetic perturbations
journal, July 2012
- Waelbroeck, F. L.; Joseph, I.; Nardon, E.
- Nuclear Fusion, Vol. 52, Issue 7
Identification of multi-modal plasma responses to applied magnetic perturbations using the plasma reluctance
journal, May 2016
- Logan, Nikolas C.; Paz-Soldan, Carlos; Park, Jong-Kyu
- Physics of Plasmas, Vol. 23, Issue 5
Interaction of tearing modes with external structures in cylindrical geometry (plasma)
journal, July 1993
- Fitzpatrick, R.
- Nuclear Fusion, Vol. 33, Issue 7
Plasma transport in mixed magnetic topologies
journal, June 1993
- Hegna, C. C.; Callen, J. D.
- Physics of Fluids B: Plasma Physics, Vol. 5, Issue 6
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
Effect of resonant magnetic perturbations on microturbulence in DIII-D pedestal
journal, October 2016
- Holod, I.; Lin, Z.; Taimourzadeh, S.
- Nuclear Fusion, Vol. 57, Issue 1
Analysis of pedestal plasma transport
journal, May 2010
- Callen, J. D.; Groebner, R. J.; Osborne, T. H.
- Nuclear Fusion, Vol. 50, Issue 6
Direct measurements of internal structures of born-locked modes and the key role in triggering tokamak disruptions
journal, April 2019
- Du, X. D.; Shafer, M. W.; Hu, Q. M.
- Physics of Plasmas, Vol. 26, Issue 4
Suppression of Large Edge-Localized Modes in High-Confinement DIII-D Plasmas with a Stochastic Magnetic Boundary
journal, June 2004
- Evans, T. E.; Moyer, R. A.; Thomas, P. R.
- Physical Review Letters, Vol. 92, Issue 23
Non-linear modeling of the threshold between ELM mitigation and ELM suppression by resonant magnetic perturbations in ASDEX upgrade
journal, April 2019
- Orain, F.; Hoelzl, M.; Mink, F.
- Physics of Plasmas, Vol. 26, Issue 4
Predicting rotation for ITER via studies of intrinsic torque and momentum transport in DIII-D
journal, May 2017
- Chrystal, C.; Grierson, B. A.; Staebler, G. M.
- Physics of Plasmas, Vol. 24, Issue 5
Nonambipolar Transport by Trapped Particles in Tokamaks
journal, February 2009
- Park, Jong-kyu; Boozer, Allen H.; Menard, Jonathan E.
- Physical Review Letters, Vol. 102, Issue 6