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Title: Ideal MHD stability and characteristics of edge localized modes on CFETR

Abstract

Investigation on the equilibrium operation regime, its ideal magnetohydrodynamics (MHD) stability and edge localized modes (ELM) characteristics is performed for the China Fusion Engineering Test Reactor (CFETR). The CFETR operation regime study starts with a baseline scenario (R  =  5.7 m, B T  =  5 T) derived from multi-code integrated modeling, with key parameters $${{\beta }_{{\rm N}}},{{\beta }_{{\rm T}}},{{\beta }_{{\rm p}}}$$ varied to build a systematic database. These parameters, under profile and pedestal constraints, provide the foundation for the engineering design. The long wavelength low-n global ideal MHD stability of the CFETR baseline scenario, including the wall stabilization effect, is evaluated by GATO. It is found that the low-n core modes are stable with a wall at r/a  =  1.2. An investigation of intermediate wavelength ideal MHD modes (peeling ballooning modes) is also carried out by multi-code benchmarking, including GATO, ELITE, BOUT++ and NIMROD. A good agreement is achieved in predicting edge-localized instabilities. Nonlinear behavior of ELMs for the baseline scenario is simulated using BOUT++. A mix of grassy and type I ELMs is identified. When the size and magnetic field of CFETR are increased (R  =  6.6 m, B T  =  6 T), collisionality correspondingly increases and the instability is expected to shift to grassy ELMs.

Authors:
ORCiD logo; ; ; ; ; ; ; ; ; ORCiD logo; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
the CFETR Physics Team
OSTI Identifier:
1543944
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 1; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Li, Ze-Yu, Chan, V. S., Zhu, Yi-Ren, Jian, Xiang, Chen, Jia-Le, Cheng, Shi-Kui, Zhu, Ping, Xu, Xue-Qiao, Xia, Tian-Yang, Li, Guo-Qiang, Lao, L. L., Snyder, P. B., and Wang, Xiao-Gang. Ideal MHD stability and characteristics of edge localized modes on CFETR. United States: N. p., 2017. Web. doi:10.1088/1741-4326/aa9149.
Li, Ze-Yu, Chan, V. S., Zhu, Yi-Ren, Jian, Xiang, Chen, Jia-Le, Cheng, Shi-Kui, Zhu, Ping, Xu, Xue-Qiao, Xia, Tian-Yang, Li, Guo-Qiang, Lao, L. L., Snyder, P. B., & Wang, Xiao-Gang. Ideal MHD stability and characteristics of edge localized modes on CFETR. United States. doi:10.1088/1741-4326/aa9149.
Li, Ze-Yu, Chan, V. S., Zhu, Yi-Ren, Jian, Xiang, Chen, Jia-Le, Cheng, Shi-Kui, Zhu, Ping, Xu, Xue-Qiao, Xia, Tian-Yang, Li, Guo-Qiang, Lao, L. L., Snyder, P. B., and Wang, Xiao-Gang. Thu . "Ideal MHD stability and characteristics of edge localized modes on CFETR". United States. doi:10.1088/1741-4326/aa9149.
@article{osti_1543944,
title = {Ideal MHD stability and characteristics of edge localized modes on CFETR},
author = {Li, Ze-Yu and Chan, V. S. and Zhu, Yi-Ren and Jian, Xiang and Chen, Jia-Le and Cheng, Shi-Kui and Zhu, Ping and Xu, Xue-Qiao and Xia, Tian-Yang and Li, Guo-Qiang and Lao, L. L. and Snyder, P. B. and Wang, Xiao-Gang},
abstractNote = {Investigation on the equilibrium operation regime, its ideal magnetohydrodynamics (MHD) stability and edge localized modes (ELM) characteristics is performed for the China Fusion Engineering Test Reactor (CFETR). The CFETR operation regime study starts with a baseline scenario (R  =  5.7 m, B T  =  5 T) derived from multi-code integrated modeling, with key parameters ${{\beta }_{{\rm N}}},{{\beta }_{{\rm T}}},{{\beta }_{{\rm p}}}$ varied to build a systematic database. These parameters, under profile and pedestal constraints, provide the foundation for the engineering design. The long wavelength low-n global ideal MHD stability of the CFETR baseline scenario, including the wall stabilization effect, is evaluated by GATO. It is found that the low-n core modes are stable with a wall at r/a  =  1.2. An investigation of intermediate wavelength ideal MHD modes (peeling ballooning modes) is also carried out by multi-code benchmarking, including GATO, ELITE, BOUT++ and NIMROD. A good agreement is achieved in predicting edge-localized instabilities. Nonlinear behavior of ELMs for the baseline scenario is simulated using BOUT++. A mix of grassy and type I ELMs is identified. When the size and magnetic field of CFETR are increased (R  =  6.6 m, B T  =  6 T), collisionality correspondingly increases and the instability is expected to shift to grassy ELMs.},
doi = {10.1088/1741-4326/aa9149},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 1,
volume = 58,
place = {United States},
year = {2017},
month = {11}
}

Works referenced in this record:

Physics Design of CFETR: Determination of the Device Engineering Parameters
journal, March 2014

  • Wan, Baonian; Ding, Siye; Qian, Jinping
  • IEEE Transactions on Plasma Science, Vol. 42, Issue 3
  • DOI: 10.1109/TPS.2013.2296939

Concept Design of CFETR Tokamak Machine
journal, March 2014

  • Song, Yun Tao; Wu, Song Tao; Li, Jian Gang
  • IEEE Transactions on Plasma Science, Vol. 42, Issue 3
  • DOI: 10.1109/TPS.2014.2299277

Integrated fusion simulation with self-consistent core-pedestal coupling
journal, April 2016

  • Meneghini, O.; Snyder, P. B.; Smith, S. P.
  • Physics of Plasmas, Vol. 23, Issue 4
  • DOI: 10.1063/1.4947204

Tokamak profile prediction using direct gyrokinetic and neoclassical simulation
journal, June 2009

  • Candy, J.; Holland, C.; Waltz, R. E.
  • Physics of Plasmas, Vol. 16, Issue 6
  • DOI: 10.1063/1.3167820

GATO: An MHD stability code for axisymmetric plasmas with internal separatrices
journal, December 1981


Numerical studies of edge localized instabilities in tokamaks
journal, April 2002

  • Wilson, H. R.; Snyder, P. B.; Huysmans, G. T. A.
  • Physics of Plasmas, Vol. 9, Issue 4
  • DOI: 10.1063/1.1459058

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
  • DOI: 10.1063/1.1449463

Nonlinear Simulations of Peeling-Ballooning Modes with Anomalous Electron Viscosity and their Role in Edge Localized Mode Crashes
journal, October 2010


Nonlinear magnetohydrodynamics simulation using high-order finite elements
journal, March 2004

  • Sovinec, C. R.; Glasser, A. H.; Gianakon, T. A.
  • Journal of Computational Physics, Vol. 195, Issue 1
  • DOI: 10.1016/j.jcp.2003.10.004

Fusion Nuclear Science Facility Candidates
journal, February 2011

  • Stambaugh, R. D.; Chan, V. S.; Garofalo, A. M.
  • Fusion Science and Technology, Vol. 59, Issue 2
  • DOI: 10.13182/FST59-279

A semi-empirical scaling law for the β-limit in tokamaks
journal, July 1985


Stabilization of ideal modes by resistive walls in tokamaks with plasma rotation and its effect on the beta limit
journal, May 1995

  • Ward, D. J.; Bondeson, A.
  • Physics of Plasmas, Vol. 2, Issue 5
  • DOI: 10.1063/1.871307

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
  • DOI: 10.1063/1.4898673

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
  • DOI: 10.1063/1.3309732

Effect of strong radial variation of the ion diamagnetic frequency on internal ballooning modes
journal, November 2000

  • Hastie, R. J.; Catto, Peter J.; Ramos, J. J.
  • Physics of Plasmas, Vol. 7, Issue 11
  • DOI: 10.1063/1.1310201

Phase Dynamics Criterion for Fast Relaxation of High-Confinement-Mode Plasmas
journal, February 2014


The impact of pedestal turbulence and electron inertia on edge-localized-mode crashes
journal, May 2014

  • Xi, P. W.; Xu, X. Q.; Diamond, P. H.
  • Physics of Plasmas, Vol. 21, Issue 5
  • DOI: 10.1063/1.4875332

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
  • DOI: 10.1063/1.4801746