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Improved confinement mode induced by the MARFE on the HT-7 superconducting tokamak

X Gao, Y P Zhao, J R Luo, Y X Jie, X Z Gong, B N Wan, J G Li, F X Yin, G L Kuang, X D Zhang1999年Plasma Physics and Controlled FusionIF 2.2出版社

In the HT-7 superconducting tokamak, the onset of a multifaceted asymmetric radiation from the edge (MARFE) usually occurs in the early ohmic discharges of each experimental campaign before wall conditioning. The occurrence and location of a MARFE is identified by different diagnostic systems. An improved confinement mode plasma which was induced by the MARFE is observed, and the global particle confinement time increases 1.9 times. The relaxation time between the MARFE event trigger and the L-H transition is about 1.4 ms, the following L-H transition time is 1.9 ms, and the improved confinement mode phase is maintained for about 40 ms. The MARFE cools the plasma edge, and the electron density profile is observed to become more narrow and peaked. The occurrence of a MARFE is strongly correlated with Zeff but not with the density, and it always occurs at Zeff = 3-8 ohmic discharges. In the case of a good wall condition (Zeff = 1-2), the onset of MARFEs has not been observed before reaching the Greenwald density limit.

日本語訳

HT-7超伝導トカマクにおいて、周辺部非対称多面放射(MARFE)の発生は、通常、各実験キャンペーンの壁調整前の初期オーミック放電において生じる。MARFEの発生と位置は、異なる診断システムによって同定される。MARFEによって誘起された改善閉じ込めモードプラズマが観測され、全球粒子閉じ込め時間は1.9倍に増加する。MARFE事象のトリガーとL-H遷移の間の緩和時間は約1.4msであり、その後のL-H遷移時間は1.9msであり、改善閉じ込めモード位相は約40ms維持される。MARFEはプラズマ周辺部を冷却し、電子密度分布はより鋭く、よりピーク化することが観測される。MARFEの発生はZeffと強く相関するが、密度とは相関せず、常にZeff = 3-8のオーミック放電において発生する。良好な壁状態(Zeff = 1-2)の場合、グリーンワルド密度限界に達する前にMARFEの発生は観測されていない。

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HT-7Improved confinement
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