プラズモイド放出を用いた動的ダイバータのMHDシミュレーション

概要

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We proposed a new type of dynamic divertor by use of plasmoid ejection from the main plasma. Our 2-D MHD simulation demonstrated for the first time how the plasmas and coil conditions can control plasmoid dynamics for divertor action. This dynamic divertor has four essential steps. First, current drive and heating causes the main detached plasma to expand around the divertor region, causing a plasmoid formation. Second, the expanding core plasma finally pinches off the plasmoid. Next, the plasmoid isolated from the main plasma is cooled down by Argon gas puff and finally is connected with the divertor plate. The series of divertor actions are expected to reduce the heat road to divertor plate significantly, suggesting a new type divertor useful for heavy heat load from type I Edge-Localized Mode (ELM).