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Investigation of edge localized mode in the JFT-2M tokamak

K. Nagashima, T. Shoji, Y. Miura1996年被引用 11Nuclear FusionIF 3出版社

The edge localized mode (ELM) was investigated in detail on the JFT-2M tokamak. Spatially, a pivot point was observed inside the separatrix flux surface. Temporally, an ELM event starts from the precursor oscillation, of which the growth rate was about 40 mu s. Another high frequency oscillation with about 300 kHz was found during the magnetic fluctuation burst. Just after the burst, a poloidal electric current (ELM current) was induced in the scrape-off layer. During the ELM, the particle flux to the divertor plates was transiently enhanced by a factor of about 4. The profile of the induced flux was 2-3 times broader than that in the ELM-free period. The total particle flux induced by one ELM was evaluated to be about 5% of the total plasma particles. The ELM current is characterized by its direction and its large fluctuation level. Furthermore, it was found that a large opposite current exists near the strike points on both divertor plates

日本語訳

周辺局在モード(ELM)は、JFT-2Mトカマクにおいて詳細に調査された。空間的には、セパラトリクス磁気面の内側にピボット点が観測された。時間的には、ELM事象は前駆振動から始まり、その成長時間は約40μsであった。磁気擾乱バースト中には、約300kHzの別の高周波振動が見られた。バーストの直後には、スクレイプオフ層にポロイダル方向の電流(ELM電流)が誘起された。ELM中、ダイバータ板への粒子束は過渡的に約4倍に増強された。誘起された粒子束の分布は、ELMのない期間のものより2〜3倍広かった。1回のELMによって誘起される全粒子束は、全プラズマ粒子の約5%と評価された。ELM電流は、その方向と大きな変動レベルによって特徴づけられる。さらに、両方のダイバータ板のストライク点付近に大きな逆向き電流が存在することが見出された。

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