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arXiv 2004.14605physics.plasm-ph
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仿星器中非线性陀螺运动PIC的EUTERPE程序模拟

Nonlinear gyrokinetic PIC simulations in stellarators with the code EUTERPE

E. Sánchez, A. Mishchenko, J. M. García-Regaña, R. Kleiber, A. Bottino, L. Villard, the W7-X team

摘要:

在这项工作中,第一个非线性粒子在细胞中进行模拟的仿星器与全球gyrokinetic代码EUTERPE使用现实的等离子体参数的报告。进行了几项研究,其目的是使可靠的非线性仿真仿星器与此代码。首先,EUTERPE对ORB 5在线性和非线性设置在托卡马克配置的基准。接下来,研究了噪声控制和稳定工具、Krook型碰撞算子、标记权重平滑和加热源的使用。详细研究了这些工具如何影响托卡马克和仿星器几何形状的不稳定性的线性增长率,以及它们对仿星器中线性带状流演化的影响。然后,研究了如何利用这些工具来提高仿星器配置中静电湍流的非线性模拟结果的质量。最后,这些工具被应用到一个W7-X磁配置使用实验等离子体参数。

英文摘要:

In this work, the first nonlinear particle-in-cell simulations carried out in a stellarator with the global gyrokinetic code EUTERPE using realistic plasma parameters are reported. Several studies are conducted with the aim of enabling reliable nonlinear simulations in stellarators with this code. First, EUTERPE is benchmarked against ORB5 in both linear and nonlinear settings in a tokamak configuration. Next, the use of noise control and stabilization tools, a Krook-type collision operator, markers weight smoothing and heating sources is investigated. It is studied in detail how these tools influence the linear growth rate of instabilities in both tokamak and stellarator geometries and their influence on the linear zonal flow evolution in a stellarator. Then, it is studied how these tools allow improving the quality of the results in a set of nonlinear simulations of electrostatic turbulence in a stellarator configuration. Finally, these tools are applied to a W7-X magnetic configuration using experimental plasma parameters.

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