Magnetic Field Analysis during Breakdown Phase in the Low Loop Resitance Tokamak HT-2

概要

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The magnetic analysis code SHP was improved in order to understand the poloidal magnetic field during the breakdown phase of the Hitachi tokamak HT-2, which had its loop resistance modified to a very low value. The SHP code uses a model with filamental loop currents in the plasma area. Its improvements are the following. (1) The eddy currents on the vacuum vessel, which are assumed to be uniform in the toroidal direction, are expanded by distribution functions obtained by a singular value decomposition of a projection matrix from the eddy currents to the flux distribution on the plasma surface area. (2) The magnetic field due to the iron core biasing current and the stray horizontal field of the toroidal field coils are compensated. After improvements, it was confirmed that the poloidal field null point was generated before breakdown and the SHP results were consistent with discharge photographs taken by a high speed camera.
社団法人プラズマ・核融合学会の論文
1994-06-25