大型等离子体装置等离子体不稳定性分析及BOUT程序验证
Analysis of plasma instabilities and verification of the BOUT code for the Large Plasma Device
摘要：
大型等离子体装置中线性不稳定性的性质[W. Gekelman等人，Rev. Sci.仪器：62，2875（1991）]的研究都通过解析计算和数值求解线性化碰撞等离子体流体方程组使用三维流体程序BOUT [M. Umansky等人，等离子体物理180，887（2009）]，其已被成功地修改以处理圆柱形几何形状。不稳定驱动等离子体压力梯度和流动被认为是，专注于电阻漂移波，开尔文-亥姆霍兹和旋转交换不稳定性。导出并分析了包含这些模式的部分电离碰撞等离子体的一般线性色散关系。对于LAPD相关配置文件，包括强驱动流，它被发现，所有三种模式可以有可比的增长率和频率。与解析色散关系的解的详细比较表明，BOUT准确地再现了该系统中线性模式的所有特性。
英文摘要：
The properties of linear instabilities in the Large Plasma Device [W. Gekelman et al., Rev. Sci. Inst., 62, 2875 (1991)] are studied both through analytic calculations and solving numerically a system of linearized collisional plasma fluid equations using the 3D fluid code BOUT [M. Umansky et al., Contrib. Plasma Phys. 180, 887 (2009)], which has been successfully modified to treat cylindrical geometry. Instability drive from plasma pressure gradients and flows is considered, focusing on resistive drift waves, the Kelvin-Helmholtz and rotational interchange instabilities. A general linear dispersion relation for partially ionized collisional plasmas including these modes is derived and analyzed. For LAPD relevant profiles including strongly driven flows it is found that all three modes can have comparable growth rates and frequencies. Detailed comparison with solutions of the analytic dispersion relation demonstrates that BOUT accurately reproduces all characteristics of linear modes in this system.
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