Global gyrokinetic simulation of microturbulence with kinetic electrons in the presence of magnetic island in tokamak
- 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
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of California, Oakland, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); China National Magnetic Confinement Fusion Science Program; China Scholarship Council (CSC)
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725; 2018YFE0304100; 201306010032
- OSTI ID:
- 1565764
- Alternate ID(s):
- OSTI ID: 1514743
- Journal Information:
- Physics of Plasmas, Vol. 26, Issue 5; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Gyrokinetic simulations of nonlinear interactions between magnetic islands and microturbulence
|
journal | September 2019 |
Similar Records
Modelling of electrostatic ion-scale turbulence in divertor tokamaks with the gyrokinetic code $\mathrm{COGENT}$
PIC simulations of microturbulence in the presence of a magnetic island