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000890591 1001_ $$0P:(DE-Juel1)169485$$aOelmann, Jannis$$b0$$eCorresponding author
000890591 245__ $$aHydrogen content in divertor baffle tiles in Wendelstein 7-X
000890591 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2021
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000890591 520__ $$aPlasma–wall interactions play a crucial role for the performance of fusion devices and the lifetime of plasma-facing components. In this work the results of some plasma–wall interaction processes, namely the erosion/deposition pattern and the fuel content of divertor baffle tiles exposed in Wendelstein 7-X in the initial phase of island divertor, are presented. Net-deposition of carbon with co-deposited oxygen and hydrogen is determined on the graphite tiles after about 1 hour of plasma operation in hydrogen and helium in operation phase OP 1.2a. C is predominately a result of net-erosion of the graphite target plates and oxygen is the strongest intrinsic impurity in Wendelstein 7-X in OP 1.2a. The hydrogen content distribution on a set of tiles exposed in equivalent positions in three of the five modules of the stellarator was quantified for the first time. Ex-situ performed laser-induced breakdown spectroscopy measurements show the depth-resolved fuel content in deposited layers as well as implantation and diffusion in the base material. Complementary, gas analysis after laser-induced ablation offers quantitative hydrogen content determination in the deposited layers up to 1018 hydrogen atoms/cm that is non-uniformly distributed over the 95 mm   125 mm sized tiles. The results show a toroidal asymmetry with 60% more hydrogen in the stellarator module 2 with respect to module 1 as well as a slight top-down asymmetry for the baffle tiles in upper and lower half modules. A clear dependence of the hydrogen content on the surface temperature during plasma exposition in stellarator discharges in standard magnetic divertor configuration with edge transformation 5/5 was not observed.
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000890591 7001_ $$0P:(DE-Juel1)179464$$aWüst, Erik$$b1
000890591 7001_ $$0P:(DE-Juel1)129976$$aBrezinsek, Sebastijan$$b2
000890591 7001_ $$0P:(DE-Juel1)171238$$aLi, Cong$$b3
000890591 7001_ $$0P:(DE-Juel1)177637$$aZhao, Dongye$$b4$$ufzj
000890591 7001_ $$0P:(DE-Juel1)162160$$aRasinski, Marcin$$b5
000890591 7001_ $$0P:(DE-HGF)0$$aDhard, Chandra Prakash$$b6
000890591 7001_ $$00000-0002-5337-6963$$aMayer, Matej$$b7
000890591 7001_ $$00000-0003-4265-6078$$aNaujoks, Dirk$$b8
000890591 7001_ $$0P:(DE-Juel1)161317$$aGao, Yu$$b9
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