Analysis of the impurity flow velocity in a wide plasma parameter range for deuterium and hydrogen plasmas in the divertor legs of the stochastic layer in LHD
| Autor: | Kuzmin, Arseniy, KOBAYASHI, Masahiro, Nakano, T., KAWAMURA, Gakushi, HASUO, Masahiro, FUJII, Keisuke, MORISAKI, Tomohiko, LHD, Experiment Group |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Hydrogen Materials Science (miscellaneous) chemistry.chemical_element 01 natural sciences 010305 fluids & plasmas Impurity Physics::Plasma Physics 0103 physical sciences 010306 general physics Impurity transport Spectroscopy Divertor Plasma Deuterium Edge plasm lcsh:TK9001-9401 Carbon Magnetic field Nuclear Energy and Engineering Flow velocity chemistry Plasma parameter lcsh:Nuclear engineering. Atomic power Atomic physics |
| Zdroj: | Nuclear Materials and Energy, Vol 17, Iss, Pp 217-221 (2018) |
| ISSN: | 2352-1791 |
| DOI: | 10.1016/j.nme.2018.11.009 |
| Popis: | Impurity flow velocity measurements have been conducted for different magnetic field configurations in a wide plasma parameter range in the divertor leg region of LHD for understanding of the edge impurity transport. In all cases (densities, magnetic configurations, hydrogen (H) & deuterium (D) discharges), flows of several tens of km/s are observed. It is found that the flow in thick stochastic layer is faster than in thin stochastic layer configuration by a factor of 3. Different velocities of different charge states of carbon impurity are observed. The simulation with EMC3-EIRENE code shows similar trend as the experiments, but only qualitatively: faster flow in H compared to D discharges due to the mass effect, faster flow in the case of thick stochastic layer. However, synthetic spectra show discrepancy with experiments in the absolute Doppler shift, where the impurity velocity in the experiments is one order faster compared to the simulations. Keywords: Spectroscopy, Hydrogen, Deuterium, Carbon, Impurity transport, Edge plasma |
| Databáze: | OpenAIRE |
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