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- W2019907632 abstract "Results of plasma-surface interaction studies made during the early phases of operation of the Tokamak de Varennes are summarized. It was found that the desorption of molecules from the internal walls by UV radiation can be used to reduce the base pressure. Auger depth profiling of stainless steel (SS) samples exposed to hydrogen discharge cleaning has been performed. Glow discharges at about 0.1 mbar etch the surface carbon and oxide at a rate of 0.5 nm/h. RF-glow discharges at 10−3 mbar result in a rapid reduction of the oxide and its replacement by a carbide layer (the graphite limiters being the source of the carbon). Long-term wall samples of SS and Si have been profiled by Auger and nuclear analysis. The SS sample has a similar composition to that exposed to the RF-glow conditioning. The Si sample is covered by a 3 nm deposit of metals, C and O, and contains 1016 H/cm2 within 30 nm of the surface; this dose and width are consistent with the history of the sample." @default.
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- W2019907632 date "1989-04-01" @default.
- W2019907632 modified "2023-09-30" @default.
- W2019907632 title "First results on plasma-surface interactions in the tokamak de varennes" @default.
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- W2019907632 doi "https://doi.org/10.1016/0022-3115(89)90366-8" @default.
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