Journal
NUCLEAR FUSION
Volume 58, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/aace69
Keywords
SOL/divertor plasma; impurity flow; spectrometer; LHD
Categories
Funding
- National Natural Science Foundation of China [11405021, 11675037]
- National Key R&D Program of China [2017YFE0300402, 2017YFE0300501]
- High-level Talent Innovation Support Program of Dalian [2017RQ052]
- Fundamental Research Funds for the Central Universities [DUT18LK03]
- Japan Society for the Promotion of Science [16H04622, 16K18340, 16H06139, 15H04236, 25420893, 24760702]
- Grants-in-Aid for Scientific Research [15H04236, 25420893, 16H04622, 24760702] Funding Source: KAKEN
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Edge carbon impurity flow in the stochastic layer of the Large Helical Device (LHD) has been investigated with the three-dimensional (3D) edge transport code EMC3-EIRENE. The simulated synthetic C3+ impurity flow profile from EMC3-EIRENE shows a reasonable agreement with the vacuum ultraviolet (VUV) measurements according to the CIV (1548.20 x 2 angstrom) Doppler-shift spectrum. The same horizontally outward C3+ impurity flows at the top and bottom edges of the stochastic layer are determined by the 3D magnetic field structure and the parallel C3+ impurity flow velocity. The observed up-down asymmetric structure of the C3+ impurity flow at the top and bottom edges is caused by the vertical displacement of the VUV spectrometer from the midplane. The horizontally outward shift of the magnetic axis position from 3.6 to 3.9 m leads to a change of the C3+ impurity flow direction at the top and bottom edges. For a high upstream plasma density, the transport of the C3+ impurity flow is mainly determined by the background parallel plasma flow, while a reversed C3+ impurity flow is obtained for a low upstream plasma density, due to the expansion of the thermal force dominant regions. The enhanced thermal force leads to a suppression of the impurity screening effect.
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