コンパクトトーラスプラズマ磁気面再構成におけるn=1モード非軸対称不安定性の影響

概要

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The influence of non-axisymmetric instabilities, specifically the n=1 toroidal mode, was studied on the magnetic flux contours that are numerically reconstructed by use of magnetic field profiles measured in Proto-TS-4 device. The device has a cylindrical vacuum vessel with a couple of coaxial magnetized plasma guns at both ends and a magnetic flux conserver with a side axial length of 600mm and a diameter of 940mm. The main measurement system consists of a 2-dimensional magnetic probe array on the poloidal plane(r-z plane) with two components, Bz and Bt(total 84 channel pick-up coils). The Bz field data are used to reconstruct the poloidal magnetic surfaces(Ψ) on the assumption that plasma configuration has axisymmetry. In this study, deformation of the reconstructed flux contours has been studied particularly when the plasma configurations were subjected to a macroscopic instability, specifically n=1 toroidal mode instability. The influence of this component on the reconstructed contours was analytically calculated and the results were qualitatively compared with the contours experimentally observed. Types of n=1 error, namely, shift or tilt, on the reconstructed magnetic surface were also qualitatively discussed.
社団法人電気学会の論文
2003-04-01