Toroidally symmetric/asymmetric effect on the divertor flux due to neon/nitrogen seeding in LHD
| Autor: | Ryuichi Sakamoto, Masahiro Kobayashi, Hirohiko Tanaka, Byron J. Peterson, T. Morisaki, Noriyasu Ohno, Suguru Masuzaki, Kiyofumi Mukai, Ryuichi Sano, Shuyu Dai, Tsuyoshi Akiyama, Gakushi Kawamura |
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| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
Toroid Materials Science (miscellaneous) Divertor Flux chemistry.chemical_element lcsh:TK9001-9401 01 natural sciences Nitrogen 010305 fluids & plasmas Magnetic field Large Helical Device Neon Nuclear Energy and Engineering chemistry Physics::Plasma Physics 0103 physical sciences lcsh:Nuclear engineering. Atomic power Seeding Atomic physics 010306 general physics |
| Zdroj: | Nuclear Materials and Energy, Vol 12, Iss, Pp 241-246 (2017) |
| ISSN: | 2352-1791 |
| DOI: | 10.1016/j.nme.2016.12.020 |
| Popis: | Toroidal distributions of divertor particle flux during neon (Ne) and nitrogen (N2) seeded discharges were investigated in the Large Helical Device (LHD). By using 14 toroidally distributed divertor probe arrays, which were positioned at radially inner side where the divertor flux concentrates in the inward-shifted magnetic axis configuration, it is found that Ne puffing leads to toroidally quasi-uniform reduction of divertor particle fluxes; whereas toroidally localized reductions were observed with N2 puffing. The toroidally asymmetric reduction pattern with N2 puffing is strongly related to the magnetic field structure around the N2 puffing port. Assuming that nitrogen particles do not recycle, EMC3-EIRENE simulation shows similar reduction pattern with the experiment around the N2 puffing port. Keywords: Impurity seeding, LHD, Toroidal divertor probe arrays, Neon, Nitrogen, EMC3-EIRENE |
| Databáze: | OpenAIRE |
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