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000891415 1001_ $$0P:(DE-Juel1)168296$$aWang, E.$$b0$$eCorresponding author$$ufzj
000891415 245__ $$aImpurity sources and fluxes in W7-X: from the plasma-facing components to the edge layer
000891415 260__ $$aStockholm$$bThe Royal Swedish Academy of Sciences$$c2020
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000891415 520__ $$aWendelstein 7-X (W7-X) is a nearly full-carbon machine with graphite divertors, baffles and shields in Operation Phase 1.2b (OP 1.2b). Divertor spectrometer measurements showed that an amount of helium and oxygen impurities existed in the predominately hydrogen plasma, which resulted in a high carbon impurity level by enhanced physical and chemical sputtering by these impurities in comparison with the pure impinging proton yields. In order to improve the wall conditions, especially to reduce the oxygen content, boronizations were applied in OP1.2b. After the boronization, an oxygen decrease by more than an order of magnitude was observed. Helium disappeared in comparison with OP1.2a due to reduced application of helium wall conditioning after introduction of boronizations. The overall radiation normalized to line integrated density was reduced by a factor of six. In addition, local CH4 injection was applied in the divertor in order to quantify the chemical sputtering by hydrogen on divertor plates. The experimentally determined effective D/XB of the A–X band of CH resulting from CH4 was ${\left[\tfrac{{D}}{{X}{B}}\right]}_{{{A}}^{2}{\rm{\Delta }}\to {{X}}^{2}{\rm{\Pi }}}^{{\rm{C}}{{\rm{H}}}_{4}\to {\rm{C}}{\rm{H}}}=16$ at Te ≈ 20 eV and ne ≈ 5 × 1018 m−3. It was applied to determine the hydrocarbon fluxes and further to deduce the particle flux ratio ГCH4/ГH on divertor plates.
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000891415 7001_ $$0P:(DE-Juel1)168195$$aSereda, S.$$b2$$ufzj
000891415 7001_ $$00000-0002-9830-9641$$aButtenschön, B.$$b3
000891415 7001_ $$0P:(DE-HGF)0$$aBarbui, T.$$b4
000891415 7001_ $$0P:(DE-HGF)0$$aDhard, C. P.$$b5
000891415 7001_ $$00000-0003-2314-8393$$aEndler, M.$$b6
000891415 7001_ $$0P:(DE-Juel1)174060$$aFord, O.$$b7
000891415 7001_ $$0P:(DE-HGF)0$$aFlom, E.$$b8
000891415 7001_ $$00000-0002-1104-4434$$aHammond, K. C.$$b9
000891415 7001_ $$0P:(DE-HGF)0$$aJakubowski, M.$$b10
000891415 7001_ $$0P:(DE-HGF)0$$aKrychowiak, M.$$b11
000891415 7001_ $$0P:(DE-HGF)0$$aKornejew, P.$$b12
000891415 7001_ $$aKönig, R.$$b13
000891415 7001_ $$aLiang, Y.$$b14
000891415 7001_ $$aMayer, M.$$b15
000891415 7001_ $$0P:(DE-HGF)0$$aNaujoks, D.$$b16
000891415 7001_ $$0P:(DE-Juel1)130109$$aNeubauer, O.$$b17$$ufzj
000891415 7001_ $$0P:(DE-Juel1)169485$$aOelmann, J.$$b18$$ufzj
000891415 7001_ $$0P:(DE-Juel1)162160$$aRasinski, M.$$b19
000891415 7001_ $$0P:(DE-HGF)0$$aWinters, V. R.$$b20
000891415 7001_ $$0P:(DE-Juel1)171567$$aGoriaev, A.$$b21
000891415 7001_ $$0P:(DE-Juel1)145890$$aWauters, T.$$b22
000891415 7001_ $$aWei, Y.$$b23
000891415 7001_ $$0P:(DE-Juel1)145222$$aZhang, D.$$b24$$ufzj
000891415 773__ $$0PERI:(DE-600)1477351-X$$a10.1088/1402-4896/ab4c04$$gVol. T171, p. 014040 -$$p014040 -$$tPhysica scripta$$vT171$$x1402-4896$$y2020
000891415 8564_ $$uhttps://juser.fz-juelich.de/record/891415/files/Wang_2020_Phys._Scr._2020_014040.pdf$$yRestricted
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