Edge state selection by modulating E × B shearing profile in toroidally confined plasmas
Abstract
We investigate how the E × B shearing profile impacts the energy transport induced by the MHD mode in the edge of H-mode plasmas. By enhancing the outer layer (ψnor ≈ 0.9–1) shear, the growth rate spectrum γ(n) gets narrowed with the fastest growth rate having a lower toroidal mode number. In the nonlinear stage, the MHD fluctuations tend to reach a coherent, oscillating state, which is analogous to a quiescent (Q) H mode state with edge-harmonic-oscillations. By enhancing the inner layer (ψnor ≈ 0.7–0.8) shear, γ(n) shifts to lower n, and its width does not change much. In the nonlinear stage, the edge fluctuations tend to stay in an incoherent, oscillating state, which is analogous to a turbulent QH-mode state. Here, we also explore the underlying physics of the results and show that they are closely related to the different cross-phase dynamics of the edge MHD fluctuations induced by the variation of the edge E × B shearing profile.
- Authors:
-
[1];
[2];
- Peking Univ., Beijing (China)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1566001
- Alternate Identifier(s):
- OSTI ID: 1513056
- Report Number(s):
- LLNL-JRNL-759659
Journal ID: ISSN 1070-664X; 948107; TRN: US2000951
- Grant/Contract Number:
- AC52-07NA27344; LLNL-JRNL-759659
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 5; 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
Zhang, Y., Guo, Z. B., Xu, X. Q., and Chen, J. G. Edge state selection by modulating E × B shearing profile in toroidally confined plasmas. United States: N. p., 2019.
Web. doi:10.1063/1.5093773.
Zhang, Y., Guo, Z. B., Xu, X. Q., & Chen, J. G. Edge state selection by modulating E × B shearing profile in toroidally confined plasmas. United States. https://doi.org/10.1063/1.5093773
Zhang, Y., Guo, Z. B., Xu, X. Q., and Chen, J. G. Thu .
"Edge state selection by modulating E × B shearing profile in toroidally confined plasmas". United States. https://doi.org/10.1063/1.5093773. https://www.osti.gov/servlets/purl/1566001.
@article{osti_1566001,
title = {Edge state selection by modulating E × B shearing profile in toroidally confined plasmas},
author = {Zhang, Y. and Guo, Z. B. and Xu, X. Q. and Chen, J. G.},
abstractNote = {We investigate how the E × B shearing profile impacts the energy transport induced by the MHD mode in the edge of H-mode plasmas. By enhancing the outer layer (ψnor ≈ 0.9–1) shear, the growth rate spectrum γ(n) gets narrowed with the fastest growth rate having a lower toroidal mode number. In the nonlinear stage, the MHD fluctuations tend to reach a coherent, oscillating state, which is analogous to a quiescent (Q) H mode state with edge-harmonic-oscillations. By enhancing the inner layer (ψnor ≈ 0.7–0.8) shear, γ(n) shifts to lower n, and its width does not change much. In the nonlinear stage, the edge fluctuations tend to stay in an incoherent, oscillating state, which is analogous to a turbulent QH-mode state. Here, we also explore the underlying physics of the results and show that they are closely related to the different cross-phase dynamics of the edge MHD fluctuations induced by the variation of the edge E × B shearing profile.},
doi = {10.1063/1.5093773},
journal = {Physics of Plasmas},
number = 5,
volume = 26,
place = {United States},
year = {Thu May 16 00:00:00 EDT 2019},
month = {Thu May 16 00:00:00 EDT 2019}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
Cited by: 5 works
Citation information provided by
Web of Science
Web of Science
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
Nonlinear MHD simulations of Quiescent H-mode plasmas in DIII-D
journal, September 2015
- Liu, F.; Huijsmans, G. T. A.; Loarte, A.
- Nuclear Fusion, Vol. 55, Issue 11
Nonlinear Simulations of Peeling-Ballooning Modes with Anomalous Electron Viscosity and their Role in Edge Localized Mode Crashes
journal, October 2010
- Xu, X. Q.; Dudson, B.; Snyder, P. B.
- Physical Review Letters, Vol. 105, Issue 17
Influence of equilibrium shear flow on peeling-ballooning instability and edge localized mode crash
journal, September 2012
- Xi, P. W.; Xu, X. Q.; Wang, X. G.
- Physics of Plasmas, Vol. 19, Issue 9
Edge-localized-modes in tokamaks
journal, September 2014
- Leonard, A. W.
- Physics of Plasmas, Vol. 21, Issue 9
Impact of a large density gradient on linear and nonlinear edge-localized mode simulations
journal, September 2013
- Xi, P. W.; Xu, X. Q.; Xia, T. Y.
- Nuclear Fusion, Vol. 53, Issue 11
BOUT++: A framework for parallel plasma fluid simulations
journal, September 2009
- Dudson, B. D.; Umansky, M. V.; Xu, X. Q.
- Computer Physics Communications, Vol. 180, Issue 9
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
Investigation of pellet-triggered MHD events in ASDEX Upgrade and JET
journal, August 2008
- Lang, P. T.; Lackner, K.; Maraschek, M.
- Nuclear Fusion, Vol. 48, Issue 9
Advances in understanding quiescent H-mode plasmas in DIII-D
journal, May 2005
- Burrell, K. H.; West, W. P.; Doyle, E. J.
- Physics of Plasmas, Vol. 12, Issue 5
Ballooning instabilities in tokamaks with sheared toroidal flows
journal, March 1991
- Waelbroeck, F. L.; Chen, L.
- Physics of Fluids B: Plasma Physics, Vol. 3, Issue 3
Impact of the pedestal plasma density on dynamics of edge localized mode crashes and energy loss scaling
journal, December 2014
- Xu, X. Q.; Ma, J. F.; Li, G. Q.
- Physics of Plasmas, Vol. 21, Issue 12
Studies of the ‘Quiescent H-mode’ regime in ASDEX Upgrade and JET
journal, July 2005
- Suttrop, W.; Hynönen, V.; Kurki-Suonio, T.
- Nuclear Fusion, Vol. 45, Issue 7
Magnetohydrodynamic stability of tokamak edge plasmas
journal, July 1998
- Connor, J. W.; Hastie, R. J.; Wilson, H. R.
- Physics of Plasmas, Vol. 5, Issue 7
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
Quiescent double barrier high-confinement mode plasmas in the DIII-D tokamak
journal, May 2001
- Burrell, K. H.; Austin, M. E.; Brennan, D. P.
- Physics of Plasmas, Vol. 8, Issue 5
From Phase Locking to Phase Slips: A Mechanism for a Quiescent mode
journal, April 2015
- Guo, Z. B.; Diamond, P. H.
- Physical Review Letters, Vol. 114, Issue 14
Bifurcation of quiescent H-mode to a wide pedestal regime in DIII-D and advances in the understanding of edge harmonic oscillations
journal, June 2017
- Chen, Xi; Burrell, K. H.; Osborne, T. H.
- Nuclear Fusion, Vol. 57, Issue 8
Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-Da)
journal, May 2015
- Grierson, B. A.; Burrell, K. H.; Nazikian, R. M.
- Physics of Plasmas, Vol. 22, Issue 5
Stationary QH-mode plasmas with high and wide pedestal at low rotation on DIII-D
journal, September 2016
- Chen, Xi; Burrell, K. H.; Osborne, T. H.
- Nuclear Fusion, Vol. 57, Issue 2
Scaling trends of the critical E × B shear for edge harmonic oscillation onset in DIII-D quiescent H-mode plasmas
journal, September 2018
- Wilks, T. M.; Garofalo, A. M.; Diamond, P. H.
- Nuclear Fusion, Vol. 58, Issue 11
Rotational shear effects on edge harmonic oscillations in DIII-D quiescent H-mode discharges
journal, June 2016
- Chen, Xi; Burrell, K. H.; Ferraro, N. M.
- Nuclear Fusion, Vol. 56, Issue 7
Linear calculations of edge current driven kink modes with BOUT++ code
journal, October 2014
- Li, G. Q.; Xu, X. Q.; Snyder, P. B.
- Physics of Plasmas, Vol. 21, Issue 10
Reactor-relevant quiescent H-mode operation using torque from non-axisymmetric, non-resonant magnetic fields
journal, May 2012
- Burrell, K. H.; Garofalo, A. M.; Solomon, W. M.
- Physics of Plasmas, Vol. 19, Issue 5
Impact of E × B shear flow on low-n MHD instabilities
journal, May 2017
- Chen, J. G.; Xu, X. Q.; Ma, C. H.
- Physics of Plasmas, Vol. 24, Issue 5
Advances towards QH-mode viability for ELM-stable operation in ITER
journal, July 2011
- Garofalo, A. M.; Solomon, W. M.; Park, J. -K.
- Nuclear Fusion, Vol. 51, Issue 8
ELM-free stationary H-mode plasmas in the ASDEX Upgrade tokamak
journal, June 2003
- Suttrop, W.; Maraschek, M.; Conway, G. D.
- Plasma Physics and Controlled Fusion, Vol. 45, Issue 8
Plasma rotation driven by alpha particles in a tokamak reactor
journal, January 1996
- Rosenbluth, M. N.; Hinton, F. L.
- Nuclear Fusion, Vol. 36, Issue 1
Edge localized linear ideal magnetohydrodynamic instability studies in an extended-magnetohydrodynamic code
journal, March 2010
- Burke, B. J.; Kruger, S. E.; Hegna, C. C.
- Physics of Plasmas, Vol. 17, Issue 3
3D vacuum magnetic field modelling of the ITER ELM control coil during standard operating scenarios
journal, August 2013
- Evans, T. E.; Orlov, D. M.; Wingen, A.
- Nuclear Fusion, Vol. 53, Issue 9
Discovery of stationary operation of quiescent H-mode plasmas with net-zero neutral beam injection torque and high energy confinement on DIII-D
journal, March 2016
- Burrell, K. H.; Barada, K.; Chen, X.
- Physics of Plasmas, Vol. 23, Issue 5