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| 100 | 1 | _ | |a Oelmann, Jannis |0 P:(DE-Juel1)169485 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Hydrogen content in divertor baffle tiles in Wendelstein 7-X |
| 260 | _ | _ | |a Amsterdam [u.a.] |c 2021 |b Elsevier |
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| 520 | _ | _ | |a Plasma–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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| 773 | _ | _ | |a 10.1016/j.nme.2021.100943 |g p. 100943 - |0 PERI:(DE-600)2808888-8 |p 100943 - |t Nuclear materials and energy |v 26 |y 2021 |x 2352-1791 |
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