An E and B gyrokinetic simulation model for kinetic Alfven waves in tokamak plasmas

被引:2
|
作者
Rosen, M. H. [1 ,2 ]
Lu, Z. X. [1 ]
Hoelzl, M. [1 ]
机构
[1] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany
[2] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
关键词
SHEAR;
D O I
10.1063/5.0079053
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The gyrokinetic particle simulation is a powerful tool for studies of transport, nonlinear phenomenon, and energetic particle physics in tokamak plasmas. While most gyrokinetic simulations make use of the scalar and vector potentials, a new model (GK-E & B) has been developed by using the E and B field in a general form and has been implemented in simulating kinetic Alfven waves in uniform plasma [Chen et al., Sci. China: Phys., Mech. Astron. 64, 245211 (2021)]. In our work, the Chen et al. GK-E & B model has been expressed, in general, tokamak geometry using the local orthogonal coordinates and general tokamak coordinates. Its reduction for uniform plasma is verified, and the numerical results show good agreement with the original work. The theoretical dispersion relation and numerical results in the local model in screw pinch geometry are also in excellent agreement. Numerical results show excellent performance in a realistic parameter regime of burning plasmas with high values of beta/(M(e)k(1)(2)rho(2)(i)), which is a challenge for traditional methods due to the "cancellation " problem. As one application, the GK-E & B model is implemented with kinetic electrons in the local single flux surface limit. With the matched International Tokamak Physics Activity-Toroidicity-induced Alfven Eigenmodes parameters adopted, numerical results show the capability of the GK-E & B in treating the parallel electron Landau damping for realistic tokamak plasma parameters. As another application, the global GK-E & B model has been implemented with the dominant electron contribution in the cold electron limit. Its capability in simulating the finite E|| due to the finite electron mass is demonstrated. (C) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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页数:12
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