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Title: Global gyrokinetic simulation of microturbulence with kinetic electrons in the presence of magnetic island in tokamak

Abstract

An electrostatic model has been formulated and implemented in the gyrokinetic toroidal code to study the nonlinear ion temperature gradient (ITG) turbulence in the presence of an n = 1, m = 2 magnetic island. The ions are described by the gyrokinetic equation while the electrons are treated with the drift-kinetic equation. In our simulation, an n = 1, m = 2 electrostatic mode is formed with the same vortex structure of the magnetic island. When the magnetic island flattening effect is turned on, the island vortex mode is well preserved and couples to the n = 0, m = 0 geodesic acoustic mode. Simulation shows that the magnetic island can suppress the ITG turbulence at the island O-point and strengthen it near the X-point. We show that the vortex mode can generate a substantial helical shear flow around the island. Finally, we also find that the turbulence and transport are suppressed inside the island and enhanced at the island X-point

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565764
Alternate Identifier(s):
OSTI ID: 1514743
Grant/Contract Number:  
AC02-05CH11231; AC05-00OR22725
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; physics

Citation Formats

None, None. Global gyrokinetic simulation of microturbulence with kinetic electrons in the presence of magnetic island in tokamak. United States: N. p., 2019. Web. doi:10.1063/1.5096962.
None, None. Global gyrokinetic simulation of microturbulence with kinetic electrons in the presence of magnetic island in tokamak. United States. doi:10.1063/1.5096962.
None, None. Mon . "Global gyrokinetic simulation of microturbulence with kinetic electrons in the presence of magnetic island in tokamak". United States. doi:10.1063/1.5096962.
@article{osti_1565764,
title = {Global gyrokinetic simulation of microturbulence with kinetic electrons in the presence of magnetic island in tokamak},
author = {None, None},
abstractNote = {An electrostatic model has been formulated and implemented in the gyrokinetic toroidal code to study the nonlinear ion temperature gradient (ITG) turbulence in the presence of an n = 1, m = 2 magnetic island. The ions are described by the gyrokinetic equation while the electrons are treated with the drift-kinetic equation. In our simulation, an n = 1, m = 2 electrostatic mode is formed with the same vortex structure of the magnetic island. When the magnetic island flattening effect is turned on, the island vortex mode is well preserved and couples to the n = 0, m = 0 geodesic acoustic mode. Simulation shows that the magnetic island can suppress the ITG turbulence at the island O-point and strengthen it near the X-point. We show that the vortex mode can generate a substantial helical shear flow around the island. Finally, we also find that the turbulence and transport are suppressed inside the island and enhanced at the island X-point},
doi = {10.1063/1.5096962},
journal = {Physics of Plasmas},
number = 5,
volume = 26,
place = {United States},
year = {2019},
month = {5}
}

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