5.JT-60U,JFT-2Mの最近の結果および実験計画(<小特集>最近のダイバータ研究の動向>)

概要

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The JT-60U divertor research program is designed to address key issures for ITER physics R&D. Radiative cooling divertor is investigated to reduce the heat load on the divertor plates in L- and ELMy H-mode discharges. The mechanism of radiation losses is spectroscopically studied with visible spectroscopy. The peak heat flux density reaches 300-400 MW/m^2 and most of the power is deposited within a few milliseconds due to ELMs. In high density plasmas, the physically sputtered impurities from target plates are reduced and chemical sputtering by neutral particles which strike the divertor plates in the private region becomes dominant. Helium exhaust from the core plasma is observed due to wall pumping caused by Solid Target Boronization. A new W-shaped pumped divertor in JT-60U providing a dense and cold divertor plasma is the basis to develop the integrated performance in quasi-steady state. Divertor configration was modified an open divertor to a closed divertor and initial results on the closed divertor has been obtained in JFT-2M.
社団法人プラズマ・核融合学会の論文
1996-09-25