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arXiv 2109.08873physics.plasm-ph
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多尺度磁流体动力学过程的磁旋动能学模拟的公式化与验证

Formulation and verification of multiscale gyrokinetic simulation of kinetic-MHD processes in toroidal plasmas

UC Irvine(加州大学尔湾分校);Chinese Academy of Sciences(中国科学院);KAIST(韩国科学技术院);Aix-Marseille Université(艾克斯-马赛大学);University of California, San Diego(加州大学圣地亚哥分校);University of Science and Technology of China(中国科学技术大学);Peking University(北京大学)
Xishuo Wei, Pengfei Liu, Gyungjin Choi, Guillaume Brochard, Jian Bao, Javier H Nicolau, Yuehao Ma, Haotian Chen, Handi Huang, Shuying Sun, Yangyang Yu, Ethan Gr… 展开作者

Xishuo Wei, Pengfei Liu, Gyungjin Choi, Guillaume Brochard, Jian Bao, Javier H Nicolau, Yuehao Ma, Haotian Chen, Handi Huang, Shuying Sun, Yangyang Yu, Ethan Green, Fernando Eizaguirre, Zhihong Lin

AI总结:

本文提出并验证了多尺度磁旋动能学模拟模型,用于研究磁约束等离子体中的低频波和湍流,通过统一处理所有动能-磁流体动力学过程。模型通过分离电子响应为解析和非解析部分,有效求解电子漂移动能方程,并用于验证DIII-D托卡马克内部环形模的模拟。

摘要:

本文在全局托状磁旋动能学代码(GTC)中实现了综合的磁旋动能学模拟模型,并通过处理所有动能-磁流体动力学过程,验证了其用于研究磁约束等离子体中低频波和湍流的能力。本文提出了一种理论框架,通过分离电子响应为解析和非解析部分,基于电子-离子质量比的小参数,统一各种方法以高效求解电子漂移动能方程。该模型在理论和模拟中均可退化为理想磁流体动力学模型,包括线性色散关系和非线性 ponderomotive 力。该模型用于验证和验证DIII-D托卡马克内部环形模的模拟,通过准确计算等位面平行电流和可压缩磁扰动进行验证。生成了一个大规模模拟数据库,用于训练替代模型以预测环形不稳定性。统计分析表明,安全因子q=1流面的径向位置和q=1表面内的等离子体β是预测环形不稳定性最重要的参数。

英文摘要:

A comprehensive gyrokinetic simulation model has been implemented in the global toroidal gyrokinetic code (GTC) and verified for studying low-frequency waves and turbulence in magnetic fusion plasmas by treating all kinetic-MHD processes on an equal footing. A theoretical framework has been formulated to unify various methods for efficiently solving the electron drift kinetic equation in multiscale simulations by separating electron responses into analytic and non-analytic parts based on the smallness parameter of electron-to-ion mass ratio. The model can be reduced to the ideal MHD model with both the linear dispersion relation and the nonlinear ponderomotive force in theory and simulation. The model is used for the verification and validation of simulating internal kink modes in the DIII-D tokamak with accurate calculations of equilibrium parallel current and compressible magnetic perturbation. A large simulation database has been generated to train a surrogate model to predict the kink instability. Statistical analysis shows that the radial location of safety factor q=1 flux-surface and the plasma beta inside the q=1 surface are the most important parameters for predicting the kink instability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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