摘要
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.
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.
基金
Supported by the National Magnetic Confinement Fusion Science Program of China under Grant Nos 2013GB112004 and 2015GB103002
the Natural Science Research Key Project of Education Department of Anhui Province under Grant No KJ2016A434
the Doctoral Scientific Research Foundation of Anqing Normal University under Grant No 044-140001000024
the National Natural Science Foundation of China under Grant Nos 11275231,11305212,11405212 and 11261140328
the Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology under Grant No 2014FXCX003
the Hefei Science Center CAS Users with Potential Project under Grant No 2015HSC-UP007
