Impact of the pedestal plasma density on dynamics of edge localized mode crashes and energy loss scaling
Abstract
The latest BOUT++ studies show an emerging understanding of dynamics of edge localized mode(ELM) crashes and the consistent collisionality scaling of ELMenergy losses with the world multi-tokamak database. A series of BOUT++ simulations are conducted to investigate the scaling characteristics of the ELMenergy losses vs collisionality via a density scan. Moreover, the linear results demonstrate that as the pedestal collisionality decreases, the growth rate of the peeling-ballooning modes decreases for high n but increases for low n (1 < n < 5), therefore the width of the growth rate spectrum γ(n) becomes narrower and the peak growth shifts to lower n. For nonlinear BOUT++ simulations show a two-stage process of ELM crash evolution of (i) initial bursts of pressure blob and void creation and (ii) inward void propagation. The inward void propagation stirs the top of pedestal plasma and yields an increasing ELM size with decreasing collisionality after a series of micro-bursts. The pedestal plasma density plays a major role in determining the ELMenergy loss through its effect on the edge bootstrap current and ion diamagnetic stabilization. Finally, the critical trend emerges as a transition (1) linearly from ballooning-dominated states at high collisionality to peeling-dominated states at low collisionality withmore »
- Authors:
-
[1];
[2];
[3]
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Texas, Austin, TX (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Chinese Academy of Sciences, Hefei (China)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1258542
- Alternate Identifier(s):
- OSTI ID: 1226641
- Report Number(s):
- LLNL-JRNL-656259
Journal ID: ISSN 1070-664X; PHPAEN
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 21; Journal Issue: 12; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION
Citation Formats
Xu, X. Q., Ma, J. F., and Li, G. Q. Impact of the pedestal plasma density on dynamics of edge localized mode crashes and energy loss scaling. United States: N. p., 2014.
Web. doi:10.1063/1.4905070.
Xu, X. Q., Ma, J. F., & Li, G. Q. Impact of the pedestal plasma density on dynamics of edge localized mode crashes and energy loss scaling. United States. https://doi.org/10.1063/1.4905070
Xu, X. Q., Ma, J. F., and Li, G. Q. Mon .
"Impact of the pedestal plasma density on dynamics of edge localized mode crashes and energy loss scaling". United States. https://doi.org/10.1063/1.4905070. https://www.osti.gov/servlets/purl/1258542.
@article{osti_1258542,
title = {Impact of the pedestal plasma density on dynamics of edge localized mode crashes and energy loss scaling},
author = {Xu, X. Q. and Ma, J. F. and Li, G. Q.},
abstractNote = {The latest BOUT++ studies show an emerging understanding of dynamics of edge localized mode(ELM) crashes and the consistent collisionality scaling of ELMenergy losses with the world multi-tokamak database. A series of BOUT++ simulations are conducted to investigate the scaling characteristics of the ELMenergy losses vs collisionality via a density scan. Moreover, the linear results demonstrate that as the pedestal collisionality decreases, the growth rate of the peeling-ballooning modes decreases for high n but increases for low n (1 < n < 5), therefore the width of the growth rate spectrum γ(n) becomes narrower and the peak growth shifts to lower n. For nonlinear BOUT++ simulations show a two-stage process of ELM crash evolution of (i) initial bursts of pressure blob and void creation and (ii) inward void propagation. The inward void propagation stirs the top of pedestal plasma and yields an increasing ELM size with decreasing collisionality after a series of micro-bursts. The pedestal plasma density plays a major role in determining the ELMenergy loss through its effect on the edge bootstrap current and ion diamagnetic stabilization. Finally, the critical trend emerges as a transition (1) linearly from ballooning-dominated states at high collisionality to peeling-dominated states at low collisionality with decreasing density and (2) nonlinearly from turbulence spreading dynamics at high collisionality into avalanche-like dynamics at low collisionality.},
doi = {10.1063/1.4905070},
journal = {Physics of Plasmas},
number = 12,
volume = 21,
place = {United States},
year = {Mon Dec 29 00:00:00 EST 2014},
month = {Mon Dec 29 00:00:00 EST 2014}
}
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Works referenced in this record:
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
Edge-localized-modes in tokamaks
journal, September 2014
- Leonard, A. W.
- Physics of Plasmas, Vol. 21, Issue 9
Gyro-fluid and two-fluid theory and simulations of edge-localized-modes
journal, May 2013
- Xu, X. Q.; Xi, P. W.; Dimits, A.
- Physics of Plasmas, Vol. 20, Issue 5
The physics of edge localized modes (ELMs) and their role in power and particle exhaust
journal, August 1996
- Zohm, Hartmut
- Plasma Physics and Controlled Fusion, Vol. 38, Issue 8
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
Low-to-high confinement transition simulations in divertor geometry
journal, May 2000
- Xu, X. Q.; Cohen, R. H.; Rognlien, T. D.
- Physics of Plasmas, Vol. 7, Issue 5
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
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
Nonlinear ELM simulations based on a nonideal peeling–ballooning model using the BOUT++ code
journal, September 2011
- Xu, X. Q.; Dudson, B. D.; Snyder, P. B.
- Nuclear Fusion, Vol. 51, Issue 10
Characteristics of type I ELM energy and particle losses in existing devices and their extrapolation to ITER
journal, August 2003
- Loarte, A.; Saibene, G.; Sartori, R.
- Plasma Physics and Controlled Fusion, Vol. 45, Issue 9
Characterization of the density profile collapse of type I ELMs in ASDEX Upgrade with high temporal and spatial resolution reflectometry
journal, July 2004
- Nunes, I.; Conway, G. D.; Loarte, A.
- Nuclear Fusion, Vol. 44, Issue 8
Phase Dynamics Criterion for Fast Relaxation of High-Confinement-Mode Plasmas
journal, February 2014
- Xi, P. W.; Xu, X. Q.; Diamond, P. H.
- Physical Review Letters, Vol. 112, Issue 8
Impact of relative phase shift on inward turbulent spreading
journal, January 2015
- Ma, C. H.; Xu, X. Q.; Xi, P. W.
- Physics of Plasmas, Vol. 22, Issue 1
Erratum: “Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime” [Phys. Plasmas 6 , 2834 (1999)]
journal, December 2002
- Sauter, O.; Angioni, C.; Lin-Liu, Y. R.
- Physics of Plasmas, Vol. 9, Issue 12
Six-field two-fluid simulations of peeling–ballooning modes using BOUT++
journal, May 2013
- Xia, T. Y.; Xu, X. Q.; Xi, P. W.
- Nuclear Fusion, Vol. 53, 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
Works referencing / citing this record:
Impact of inward turbulence spreading on energy loss of edge-localized modesa)
journal, May 2015
- Ma, C. H.; Xu, X. Q.; Xi, P. W.
- Physics of Plasmas, Vol. 22, Issue 5
Impact of bootstrap current and Landau-fluid closure on ELM crashes and transport
journal, May 2018
- Chen, J. G.; Xu, X. Q.; Ma, C. H.
- Physics of Plasmas, Vol. 25, Issue 5
Study on edge localized mode during plasma vertical swing in HL-2A tokamak
journal, October 2018
- Wu, N.; Chen, S. Y.; Mou, M. L.
- Physics of Plasmas, Vol. 25, Issue 10
Quasi-coherent mode simulation during inter-ELM period in HL-2A
journal, December 2018
- Tang, T. F.; Shi, H.; Wang, Z. H.
- Physics of Plasmas, Vol. 25, Issue 12
Edge state selection by modulating E × B shearing profile in toroidally confined plasmas
journal, May 2019
- Zhang, Y.; Guo, Z. B.; Xu, X. Q.
- Physics of Plasmas, Vol. 26, Issue 5
Global kinetic ballooning mode simulations in BOUT++
journal, September 2016
- Ma, C. H.; Xu, X. Q.
- Nuclear Fusion, Vol. 57, Issue 1
E × B flow shear mitigates ballooning-driven edge-localized modes at high collisionality: experiment and simulation
journal, December 2018
- Kong, D. F.; Xu, X. Q.; Diamond, P. H.
- Nuclear Fusion, Vol. 59, Issue 1
Self-driven current generation in turbulent fusion plasmas
journal, June 2019
- Wang, W. X.; Hahm, T. S.; Startsev, E. A.
- Nuclear Fusion, Vol. 59, Issue 8