Measurement of Halo Current in the HT-2 Tokamak and Investigation of a Scaling Law

概要

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The halo current, which flows between the plasma and plasma facing components in a vacuum vessel during disruptions, was measured in the Hitachi tokamak HT-2 and the scaling law of the magnitude was examined based on the balance of the electromagnetic forces. Electrode plates were placed where they touched the plasma during the disruptions. A halo current flowed through the electrodes and the electrode currents were measured by Rogowski coils. The measurements showed the followings. (1)The halo current intensity I_HL is large during vertical displacement event(VDE)with rapid I_p decay and high toroidal field B_T. (2)The product of I_HL and duration time increases with I_p but have no dependence on B_T. (3)The halo current reduces the shell effect, destabilizing the plasma position. (4)A scaling law, based on a force balance on the plasma, gives an approximate estimation of the halo current magnitudes for various tokamaks.
社団法人プラズマ・核融合学会の論文
1998-05-25