Edge localized linear ideal magnetohydrodynamic instability studies in an extended-magnetohydrodynamic code
Edge localized linear ideal magnetohydrodynamic instability studies in an extended-magnetohydrodynamic code
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DOI：
10.1063/1.3309732
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发表时间：
2010-03
影响因子：
2.2
通讯作者：
B. Burke;S. Kruger;C. Hegna;P. Zhu;P. Snyder;C. Sovinec;E. Howell
中科院分区：
文献类型：
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作者：
B. Burke;S. Kruger;C. Hegna;P. Zhu;P. Snyder;C. Sovinec;E. Howell
线性理想MHD稳定性程序ELITE [H. R. Wilson等人，等离子体9，1277（2002）]、GATO [L. Bernard等人，Comput.物理通讯24，377（1981）]和扩展的非线性磁流体动力学（MHD）程序尼姆罗德[C. R. Sovinec等人，J. Comput公司Phys.195，355（2004）]进行边缘局部化（MHD）不稳定性。比较了两种气球不稳定的移圈托卡马克平衡，其中通过改变平衡等离子体轮廓来改变稳定性特征。平衡模型的H-模式等离子体与基座的压力分布和平行的边缘电流。对于这两种平衡，尼姆罗德准确地再现了过渡到不稳定（边缘不稳定模式），以及理想的增长谱的大范围的环形模式（n=1-20）。结果使用的可压缩MHD模型，并依赖于一个精确的表示的“理想”和“真空”或“晕”区域内的代码。晕圈区域是由介绍建模.
A linear benchmark between the linear ideal MHD stability codes ELITE [H. R. Wilson et al., Phys. Plasmas 9, 1277 (2002)], GATO [L. Bernard et al., Comput. Phys. Commun. 24, 377 (1981)], and the extended nonlinear magnetohydrodynamic (MHD) code, NIMROD [C. R. Sovinec et al.., J. Comput. Phys. 195, 355 (2004)] is undertaken for edge-localized (MHD) instabilities. Two ballooning-unstable, shifted-circle tokamak equilibria are compared where the stability characteristics are varied by changing the equilibrium plasma profiles. The equilibria model an H-mode plasma with a pedestal pressure profile and parallel edge currents. For both equilibria, NIMROD accurately reproduces the transition to instability (the marginally unstable mode), as well as the ideal growth spectrum for a large range of toroidal modes (n=1–20). The results use the compressible MHD model and depend on a precise representation of “ideal-like” and “vacuumlike” or “halo” regions within the code. The halo region is modeled by the introduction ...