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- W830504987 abstract "Erosion due to plasma-wall interaction can considerably restrict the lifetime of plasma-facing components. Therefore, the choice of proper first-wall materials is essential to ensure the desired performance level of a fusion reactor. In this contribution, the erosion properties of tungsten and other fusion-relevant materials have been studied at the low-field side midplane of ASDEX Upgrade during the 2010-2011 experimental campaign. A graphite probe with 50-nm thick W and Ni marker stripes and 100-nm thick Al and C markers was exposed to four high-density L-mode discharges (Ip = 1.0 MA, Bt = -2.8 T, Paux = 1.4 MW, ne= 6.6 ×10 m, total tflat-top ≈ 16 s) at 35 mm outside the separatrix and a similar probe to a single H-mode discharge (Ip = 0.8 MA, Bt = -2.5 T, Paux = 7.5 MW, ne= 6.5 ×10 m, tflat-top ≈ 1.5 s) at 43 mm outside the separatrix. Net erosion of each marker material was determined using Rutherford backscattering spectroscopy (RBS), and numerical simulations with the ERO code were performed to explain the obtained results. For the H-mode experiment, the simulations were run both during and in between ELMs to study their effect on erosion. The experimental results show that the erosion rate decreases strongly with increasing atomic number: while for the L-mode probe the erosion rate of W is 0.2 nms, the obtained erosion rates of Ni, Al and C are 7-20 times higher. Most probably due to ELMs, an enhanced erosion rate of 1 nms was observed for W in the H-mode experiment, the other materials showing up to 40 times larger erosion than in the L-mode experiment. Various plasma background fits and impurity concentrations were used in the ERO simulations to find out the sensitivity of erosion to SOL conditions and experimental uncertainties. In L-mode, the best results so far have been obtained with carbon concentration of 0.5% and rather long exponential decay lengths of 25-40 mm for ne, Te and Ti. The H-mode simulations are on-going but first results indicate that the total erosion is clearly dominated by ELMs that are modelled as temporal increases of Te and Ti from 142 eV and 198 eV to 317 eV and 375 eV at the separatrix with decay lengths of 36 mm and 16 mm, respectively." @default.
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- W830504987 date "2012-01-01" @default.
- W830504987 modified "2023-09-29" @default.
- W830504987 title "Discharge-resolved erosion processes at the low-field side midplane of ASDEX Upgrade" @default.
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