Nonlinear global gyrokinetic delta-f turbulence simulations in a quasi-axisymmetric stellarator
Nonlinear global gyrokinetic delta-f turbulence simulations in a quasi-axisymmetric stellarator
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DOI：
10.1063/1.5140232
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发表时间：
2020-04
影响因子：
2.2
通讯作者：
M. Cole;T. Moritaka;R. Hager;J. Dominski;S. Ku;C. Chang
中科院分区：
文献类型：
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作者：
M. Cole;T. Moritaka;R. Hager;J. Dominski;S. Ku;C. Chang
我们使用全球陀螺动力学仿星器代码XGC-S看湍流物理的几何拟轴对称仿星器，QUASAR。利用已建立的非线性托卡马克程序XGC 1在类回旋托卡马克中成功地对XGC-S程序进行了非线性模拟验证。然后，我们将XGC-S程序应用于非线性湍流物理的QUASAR。我们发现，高度poloidally本地化的线性模式让位于一个更均匀分布的非线性湍流结构。同时，模式的径向范围增加，并占据了很大一部分的体积，尽管最初的局部温度分布，作为配置文件放松。
We use the global gyrokinetic stellarator code XGC-S to look at turbulence physics in geometry of the proposed quasi-axisymmetric stellarator, QUASAR. The XGC-S code is first verified for nonlinear simulations of ion temperature gradient-driven turbulence by a successful benchmark with the established nonlinear tokamak code XGC1 in a CYCLONE-like tokamak case. We then apply the XGC-S code to QUASAR for nonlinear turbulence physics. We find that the highly poloidally localized linear mode gives way to a more evenly distributed nonlinear turbulent structure. Meanwhile, the radial extent of the mode increases and occupies a large fraction of the volume, despite the initially localized temperature profile, as the profiles relax.