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Abstract Toroidal distributions of divertor particle flux during neon (Ne) and nitrogen (N 2 ) seeded discharges were investigated in the Large Helical Device (LHD). By using 14 toroidally distributed… Click to show full abstract
Abstract Toroidal distributions of divertor particle flux during neon (Ne) and nitrogen (N 2 ) 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 N 2 puffing. The toroidally asymmetric reduction pattern with N 2 puffing is strongly related to the magnetic field structure around the N 2 puffing port. Assuming that nitrogen particles do not recycle, EMC3-EIRENE simulation shows similar reduction pattern with the experiment around the N 2 puffing port.
Journal Title: Nuclear materials and energy
Year Published: 2017
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