Divertor biasing effects to reduce the L-H power threshold in the JFT-2M tokamak

被引：0

作者：

Miura, Y ^{[1
]}

Asahi, Y ^{[1
]}

Hanada, K ^{[1
]}

Hoshino, K ^{[1
]}

Ida, K ^{[1
]}

Ishige, Y ^{[1
]}

Kasai, S ^{[1
]}

Kawakami, T ^{[1
]}

Kawashima, H ^{[1
]}

Maeda, M ^{[1
]}

Maeno, M ^{[1
]}

Nagashima, K ^{[1
]}

Oasa, K ^{[1
]}

Ogawa, H ^{[1
]}

Ogawa, T ^{[1
]}

Sasaki, M ^{[1
]}

Sato, M ^{[1
]}

Sengoku, S ^{[1
]}

Shiina, T ^{[1
]}

Shinohara, K ^{[1
]}

Shiraiwa, S ^{[1
]}

Shoji, T ^{[1
]}

Suzuki, N ^{[1
]}

Uehara, K ^{[1
]}

Yamauchi, T ^{[1
]}

Hasegawa, K ^{[1
]}

Itoh, K ^{[1
]}

Kashiwa, Y ^{[1
]}

Kikuchi, K ^{[1
]}

Koike, T ^{[1
]}

Komata, M ^{[1
]}

Ohuchi, Y ^{[1
]}

Okano, F ^{[1
]}

Saito, M ^{[1
]}

Sawahata, M ^{[1
]}

Seki, N ^{[1
]}

Shibata, T ^{[1
]}

Suzuki, S ^{[1
]}

Takeuchi, H ^{[1
]}

Tani, T ^{[1
]}

Tomiyama, Y ^{[1
]}

Umino, K ^{[1
]}

机构：

[1] Japan Atom Energy Res Inst, Naka Fus Res Estab, Naka, Ibaraki 31101, Japan

来源：

FUSION ENERGY 1996, VOL 1 | 1997年

关键词：

D O I：

暂无

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Divertor biasing effects to reduce the L-H power threshold are discussed. The L-H power threshold is reduced by the biasing only when a negative radial electric field is formed in the scrape-off layer (SOL) and the compression of neutrals in the divertor region is observed. If me ion (V) over bar B drift direction is reversed to be away from the X point, which means a change of the E x B flow direction in the SOL, the reduction of the power threshold is not observed. Tn this case, the compression of neutrals in the divertor region is not observed either. The effects of the compressed neutrals are investigated in an intense gas puffing experiment. After short, intense gas puffing, there is some delay before the local gas puffing effects disappear and the neutrals are compressed in the divertor region. At that time, the LH transition occurs at lower heating power than in the case without the gas puffing. The compression of neutrals in the divertor region is favourable for reducing the L-H power threshold. These observations may be explained by an H mode theory based on ion loss. Since the ion poloidal gyroradius is enlarged near the X point where the neutral density is high, banana ions may be taken away by the charge exchange reaction without having unfavourable effects on the plasma inside the separatrix.

引用

页码：167 / 175

页数：3

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