期刊
NUCLEAR FUSION
卷 51, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0029-5515/51/7/072001
关键词
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资金
- National Natural Science Foundation of China [11075181, 10725523, 10721505, 10990212, 11075185]
- ITER project of China [2010GB104001]
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.
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