Study on H-mode access at low density with lower hybrid current drive and lithium-wall coatings on the EAST superconducting tokamak

被引：129

作者：

Xu, G. S. ^{[1
]}

Wan, B. N. ^{[1
]}

Li, J. G. ^{[1
]}

Gong, X. Z. ^{[1
]}

Hu, J. S. ^{[1
]}

Shan, J. F. ^{[1
]}

Li, H. ^{[2
]}

Mansfield, D. K. ^{[3
]}

Humphreys, D. A. ^{[4
]}

Naulin, V. ^{[5
]}

机构：

[1] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China

[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China

[3] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[4] Gen Atom Co, San Diego, CA 92186 USA

[5] Assoc Euratom Riso, DK-4000 Roskilde, Denmark

来源：

NUCLEAR FUSION | 2011年 / 51卷 / 07期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1088/0029-5515/51/7/072001

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The first high-confinement mode (H-mode) with type-III edge localized modes at an H factor of H-IPB98(y,H-2) similar to 1 has been obtained with about 1 MW lower hybrid wave power on the EAST superconducting tokamak. The first H-mode plasma appeared after wall conditioning by lithium (Li) evaporation before plasma breakdown and the real-time injection of fine Li powder into the plasma edge. The threshold power for H-mode access follows the international tokamak scaling even in the low density range and a threshold in density has been identified. With increasing accumulation of deposited Li the H-mode duration was gradually extended up to 3.6 s corresponding to similar to 30 confinement times, limited only by currently attainable durations of the plasma current flat top. Finally, it was observed that neutral density near the lower X-point was progressively reduced by a factor of 4 with increasing Li accumulation, which is considered the main mechanism for the H-mode power threshold reduction by the Li wall coatings.

引用

页数：6

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