Observation of Molybdenum Emission from Impurity-Induced Long-Lived m=1 Mode on the Experimental Advanced Superconducting Tokamak

We observe the spectra of molybdenum for the first time since the first wall of our experimental advanced superconducting tokamak （EAST） was changed mainly to molybdenum tiles. A large amount of molybdenum accumulated in the central plasma where the long-lived m = 1 mode instability bursts is shown....

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Published inChinese physics letters Vol. 33; no. 6; pp. 74 - 76
Main Author 沈永才 吕波 王福地 石跃江 吴斌 李颖颖 符佳 万宝年
Format Journal Article
LanguageEnglish
Published 01.06.2016
Subjects
发射
实验
杂质积累
第一壁
等离子体
超导托卡马克装置
钼
长寿命
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Summary:We observe the spectra of molybdenum for the first time since the first wall of our experimental advanced superconducting tokamak （EAST） was changed mainly to molybdenum tiles. A large amount of molybdenum accumulated in the central plasma where the long-lived m = 1 mode instability bursts is shown. Molybdenum is proved to be the main impurity species observed during the formation and lifetime of impurity-induced long-lived m= 1 mode. This may indicate that a close relationship exists between the high-Z impurity accumulation and the occurrence of long-lived m = 1 mode in EAST plasmas.
Bibliography:11-1959/O4
We observe the spectra of molybdenum for the first time since the first wall of our experimental advanced superconducting tokamak （EAST） was changed mainly to molybdenum tiles. A large amount of molybdenum accumulated in the central plasma where the long-lived m = 1 mode instability bursts is shown. Molybdenum is proved to be the main impurity species observed during the formation and lifetime of impurity-induced long-lived m= 1 mode. This may indicate that a close relationship exists between the high-Z impurity accumulation and the occurrence of long-lived m = 1 mode in EAST plasmas.
Yong-Cai Shen, Bo Lyu, Fu-Di Wang, Yue-Jiang Shi, Bin Wu, Ying-Ying Li, Jia Pu, Bao-Nian Wan, the EAST team （1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 2 School of Physics and Electronic Engineering, Anqing Normal University, Anqing 246011 3 Hefei Science Center, Chinese Academy of Sciences, Hefei 230031 4School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026 ; 5Department of Nuclear Engineering, Seoul National University, Seoul 151-742, Korea）
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/33/6/065205