Decay Process of a Magnetic Island by External Magnetic Perturbation

概要

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Decay process of a magnetic island by adding the magnetic perturbation externallyis analyzed. A simple slab model is used and the magnetic island is considered to havea single helicity. The plasma is assumed to be incompressible. The evolution time isaffected by the presence of an original magnetic island. In the decay process, a currentflows along the separatrix of the magnetic island, and the current layer width dependson the magnetic island width, when the island is relatively wide compared to the cur-rent layer. In the presence of a magnetic island, even if the magnetic Reynoldsnumber S increases, the current layer does not become narrower. This leads to theslow evolution of the magnetic island. It is found that the time scale S 'r. is requiredto reach the last equilibrium regardless of the nonlinear terms. This is slower thanthat of the growth process, S"'r..magnetic island, decay process
社団法人日本物理学会の論文
1991-09-15