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Title: Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence

Abstract

An interplay between fluctuation driven toroidal axisymmetric flows (convective cell modes) and resistive ballooning mode turbulence after the pedestal collapse is numerically studied by a four-field reduced MHD model in the BOUT++ framework. The strong flow shear suppresses the radial transport of pressure filaments, and the pressure profile in the pedestal region is partially recovered. As a result, a secondary instability is quasilinearly excited, which yields a secondary collapse. Here, the subsequent damped oscillation is also analyzed by phase diagram analysis.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. National Institutes for Quantum and Radiological Science and Technology, Aomori (Japan)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of York, York (United Kingdom)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1568015
Alternate Identifier(s):
OSTI ID: 1512547
Report Number(s):
[LLNL-JRNL-789211]
[Journal ID: ISSN 1070-664X; 987556]
Grant/Contract Number:  
[AC52-07NA27344]
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

Seto, H., Xu, X. Q., Dudson, B. D., and Yagi, M. Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence. United States: N. p., 2019. Web. doi:10.1063/1.5086998.
Seto, H., Xu, X. Q., Dudson, B. D., & Yagi, M. Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence. United States. doi:10.1063/1.5086998.
Seto, H., Xu, X. Q., Dudson, B. D., and Yagi, M. Tue . "Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence". United States. doi:10.1063/1.5086998.
@article{osti_1568015,
title = {Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence},
author = {Seto, H. and Xu, X. Q. and Dudson, B. D. and Yagi, M.},
abstractNote = {An interplay between fluctuation driven toroidal axisymmetric flows (convective cell modes) and resistive ballooning mode turbulence after the pedestal collapse is numerically studied by a four-field reduced MHD model in the BOUT++ framework. The strong flow shear suppresses the radial transport of pressure filaments, and the pressure profile in the pedestal region is partially recovered. As a result, a secondary instability is quasilinearly excited, which yields a secondary collapse. Here, the subsequent damped oscillation is also analyzed by phase diagram analysis.},
doi = {10.1063/1.5086998},
journal = {Physics of Plasmas},
number = [5],
volume = [26],
place = {United States},
year = {2019},
month = {5}
}

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