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000891411 1001_ $$0P:(DE-Juel1)158050$$aDittmar, T.$$b0$$eCorresponding author
000891411 245__ $$aLong pulse D 2 and N 2 seeded discharges on the upper actively cooled tungsten divertor of WEST
000891411 260__ $$aStockholm$$bThe Royal Swedish Academy of Sciences$$c2020
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000891411 520__ $$aA series of L-mode discharges in upper single null configuration with more than 30 s duration were performed in the WEST tokamak with the strike line on actively cooled tungsten-coated divertor components. This series of discharges accumulated 20 min of plasma and a strike point fluence of $\approx 2\times {10}^{25}\,{{\rm{m}}}^{-2}$ in two days of operation in attached conditions. The discharges showed good density control, no tungsten accumulation and overall very benign thermal behaviour of the upper divertor. A subset of the discharges were seeded with nitrogen either in the divertor or midplane region to study plasma–wall interaction and associated ammonia formation in this weakly pumped scenario with all-tungsten plasma-facing components. While ammonia signals remained too weak for useful analysis, a strong dependence of nitrogen plasma penetration efficiency and residence time on the injection location was found. This hints towards a currently underestimated plasma-near nitrogen reservoir in these tokamak discharges in divertor configuration.
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000891411 7001_ $$0P:(DE-HGF)0$$aLoarer, T.$$b1
000891411 7001_ $$0P:(DE-HGF)0$$aDrenik, A.$$b2
000891411 7001_ $$0P:(DE-HGF)0$$aBourdelle, C.$$b3
000891411 7001_ $$0P:(DE-Juel1)129976$$aBrezinsek, S.$$b4
000891411 7001_ $$0P:(DE-HGF)0$$aDesgranges, C.$$b5
000891411 7001_ $$0P:(DE-HGF)0$$aDouai, D.$$b6
000891411 7001_ $$0P:(DE-HGF)0$$aFedorczak, N.$$b7
000891411 7001_ $$0P:(DE-HGF)0$$aGuirlet, R.$$b8
000891411 7001_ $$0P:(DE-HGF)0$$aGunn, J.$$b9
000891411 7001_ $$0P:(DE-HGF)0$$aMeyer, O.$$b10
000891411 7001_ $$0P:(DE-HGF)0$$aLaguardia, L.$$b11
000891411 7001_ $$0P:(DE-HGF)0$$aTsitrone, E.$$b12
000891411 773__ $$0PERI:(DE-600)1477351-X$$a10.1088/1402-4896/ab753f$$gVol. T171, p. 014074 -$$p014074 -$$tPhysica scripta$$vT171$$x1402-4896$$y2020
000891411 8564_ $$uhttps://juser.fz-juelich.de/record/891411/files/Dittmar_2020_Phys._Scr._2020_014074.pdf$$yRestricted
000891411 8564_ $$uhttps://juser.fz-juelich.de/record/891411/files/Postprint_Dittmar_134.pdf$$yPublished on 2020-06-24. Available in OpenAccess from 2021-06-24.
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