Journal
PHYSICS OF PLASMAS
Volume 26, Issue 3, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5052347
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Funding
- Key Research and Development Program of China [2017YFE031300]
- National Magnetic Confinement Fusion Science Program of China [2015GB103002]
- Key Program of Research and Development of Hefei Science Center [2017HSC-KPRD002]
- National Natural Science Foundation of China [11805231]
- Anhui Provincial Natural Science Foundation [1808085QA.14]
- ASIPP Science and Research Grant [DSJJ-17-03]
- Natural Science Research Key Project of Education Department of Anhui Province [KJ2016A434]
- Anqing Normal University Project [043-180079]
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Core metal impurity transport in an electron cyclotron resonance heating (ECRH) plasma is investigated for the first time in experimental advanced superconducting tokamak, on the basis of profile measurements of impurity emissions using space-resolved extreme ultraviolet spectroscopy. A significant reduction in the core molybdenum emissivity is observed during the on-axis ECRH phase, accompanied by decreased core electron density and increased electron temperature. The impurity transport study before and during ECRH injection is performed using line emissions of Mo XXIX, Mo XXX, Mo XXXI, and Mo XXXII with the core impurity transport code, STRAHL. It is found that the diffusion coefficient increases substantially and that the value of the diffusion coefficient is about one order of magnitude higher than that of neoclassical transport. Also, the inward convective velocity decreases and even changes its direction in the core region (rho <0.5) during on-axis ECRH, which is thought to dominantly contribute to the reduction in core impurity ion density. Published under license by AIP Publishing.
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