期刊
PHYSICS OF PLASMAS
卷 23, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4939539
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资金
- U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences [DE-FG02-06ER54852, DE-FG02-04ER54739, DE-AC52-07NA27344]
- Russian Ministry of Education and Science [14.Y26.31.0008]
Two different oscillatory plasma regimes induced by seeding the plasma with high-and low-Z impurities are found for ITER-like divertor plasmas, using computer modeling with the DUSTT/UEDGE and SOLPS4.3 plasma-impurity transport codes. The oscillations are characterized by significant variations of the impurity-radiated power and of the peak heat load on the divertor targets. Qualitative analysis of the divertor plasma oscillations reveals different mechanisms driving the oscillations in the cases of high-and low-Z impurity seeding. The oscillations caused by the high-Z impurities are excited near the X-point by an impurity-related instability of the radiation-condensation type, accompanied by parallel impurity ion transport affected by the thermal and plasma friction forces. The driving mechanism of the oscillations induced by the low-Z impurities is related to the cross-field transport of the impurity atoms, causing alteration between the high and low plasma temperature regimes in the plasma recycling region near the divertor targets. The implications of the impurity-induced plasma oscillations for divertor operation in the next generation tokamaks are also discussed. (C) 2016 AIP Publishing LLC.
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