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

Fang, K. S.; Lin, Z.

doi:10.1063/1.5096962

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

Journal Article · Mon May 20 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5096962· OSTI ID:1565764

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Peking Univ., Beijing (China)
Univ. of California, Irvine, CA (United States)

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

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: China National Magnetic Confinement Fusion Science Program; China Scholarship Council (CSC); USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1565764

Alternate ID(s):: OSTI ID: 1514743

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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

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