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| Home > Publications database > Long pulse D 2 and N 2 seeded discharges on the upper actively cooled tungsten divertor of WEST |
| Home > Publications database > Long pulse D 2 and N 2 seeded discharges on the upper actively cooled tungsten divertor of WEST |
| Journal Article | FZJ-2021-01496 |
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2020
The Royal Swedish Academy of Sciences
Stockholm
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Please use a persistent id in citations: http://hdl.handle.net/2128/27484 doi:10.1088/1402-4896/ab753f
Abstract: A series of L-mode discharges in upper single null configuration with more than 30 s duration were performed in the WEST tokamak with the strike line on actively cooled tungsten-coated divertor components. This series of discharges accumulated 20 min of plasma and a strike point fluence of $\approx 2\times {10}^{25}\,{{\rm{m}}}^{-2}$ in two days of operation in attached conditions. The discharges showed good density control, no tungsten accumulation and overall very benign thermal behaviour of the upper divertor. A subset of the discharges were seeded with nitrogen either in the divertor or midplane region to study plasma–wall interaction and associated ammonia formation in this weakly pumped scenario with all-tungsten plasma-facing components. While ammonia signals remained too weak for useful analysis, a strong dependence of nitrogen plasma penetration efficiency and residence time on the injection location was found. This hints towards a currently underestimated plasma-near nitrogen reservoir in these tokamak discharges in divertor configuration.
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