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We investigate heat diffusion across a local strong stochastic magnetic field by using eleven low-m perturbed magnetic islands. A maximum stochasticity of 38.82 between two neighboring rational surfaces is attained. The correlation between the effective radial heat conductivity xτ and the ratio of the parallel heat diffusion coefficient to the perpendicular coefficient, χⅡ/χ⊥, is numerically studied and compared with earlier work. 相似文献
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托卡马克等离子体的三角形变和拉长比对约束和磁流体稳定性有很强的影响,因此在托卡马克装置极向场设计中,在基于物理和工程考虑所预先选定的等离子体平衡位形几何参数下,如何优化确定外部极向场线圈位置和电流,是一个具有重要实际意义的研究课题.为优化确定托卡马克极向场线圈,给出了一个有效的多变量平衡优化方法,能以事先规定的等离子体平衡位形的一些几何参数为目标函数,优化确定极向场线圈位置和电流.并应用它于HT-7U平衡位形计算,得到了所需的结果.
关键词:
等离子体平衡
极向场线圈
优化 相似文献
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The ordinary differential magnetic field line equations are solved numerically; the tokamak magnetic structure is studied on Hefei Tokamak-7 Upgrade (HT-TU) when the equilibrium field with a monotonic q-profile is perturbed by a helical magnetic field. We find that a single mode (m, n) helical perturbation can cause the formation of islands on rational surfaces with q=m/n and q=(m±1,±2,±3,...)/n due to the toroidicity and plasma shape (i.e. elongation and triangularity), while there are many undestroyed magnetic surfaces called Kolmogorov-Arnold-Moser (KAM) barriers on irrational surfaces. The islands on the same rational surface do not have the same size. When the ratio between the perturbing magnetic field Br(r) and the toroidal magnetic field amplitude Bφ0 is large enough, the magnetic island chains on different rational surfaces will overlap and chaotic orbits appear in the overlapping area, and the magnetic field becomes stochastic. It is remarkable that the stochastic layer appears first in the plasma edge region. 相似文献
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