| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Observation of Molybdenum Emission from Impurity-Induced Long-Lived $m=1$ Mode on the Experimental Advanced Superconducting Tokamak |
| Yong-Cai Shen1,2, Bo Lyu1,3**, Fu-Di Wang1, Yue-Jiang Shi4,5, Bin Wu1, Ying-Ying Li1, Jia Fu1, Bao-Nian Wan1, the EAST team |
1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031
2School of Physics and Electronic Engineering, Anqing Normal University, Anqing 246011
3Hefei 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
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Yong-Cai Shen, Bo Lyu, Fu-Di Wang et al 2016 Chin. Phys. Lett. 33 065205 |
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Abstract 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.
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Received: 08 March 2016
Published: 30 June 2016
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