2018年
Measurements of the Impurity Flow Velocity and Temperature in Deuterium and Hydrogen Plasmas in the Divertor Legs of the Stochastic Layer in LHD
PLASMA AND FUSION RESEARCH
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- 巻
- 13
- 号
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1585/pfr.13.3402058
- 出版者・発行元
- JAPAN SOC PLASMA SCIENCE & NUCLEAR FUSION RESEARCH
This paper presents carbon impurity flow velocity and temperature measurements in the divertor region for a wide density range n(e) = (1 - 14) x 10(19) m(-3), central electron temperature T-e = 1.5 - 3.5 keV, and with total neutral beam injection power of 9 - 12 MW. The isotope effect on the transport is studied in hydrogen (H) and deuterium (D) discharges. Flow velocities for D plasma are systematically slower, by the factor of 1.4 - 2, compared to H plasma. For all selected discharges, the carbon ions flow toward the divertor in both H and D plasmas. Different velocities are obtained depending on the charge states. For C+ and C2+ they are in the range of 10 - 30 km/s, and 5 - 20 km/s for C3+ ions. It is also found that there is no change of flow direction even in the lowest density, where the impurity transport model predicts flow toward upstream in the thermal force dominant regime. In H discharges velocities increase proportionally to the plasma density, while in D discharges this dependency is weaker. Possible mechanism to interpret these observations is discussed based on the parallel momentum balance of impurity transport. (C) 2018 The Japan Society of Plasma Science and Nuclear Fusion Research
- リンク情報
- ID情報
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- DOI : 10.1585/pfr.13.3402058
- ISSN : 1880-6821
- Web of Science ID : WOS:000482678200022