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| Hauptseite > Publikationsdatenbank > Analyses of metallic first mirror samples after long term plasma exposure in Tore Supra |
| Hauptseite > Publikationsdatenbank > Analyses of metallic first mirror samples after long term plasma exposure in Tore Supra |
| Journal Article | PreJuSER-57841 |
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2006
Elsevier
New York, NY [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.fusengdes.2005.07.017
Abstract: Metallic mirrors are foreseen in ITER diagnostic systems as optical elements directly viewing the plasma radiation. In the frame of an EFDA contract, metallic mirror samples have been exposed for long pulse plasma discharges in Tore Supra (TS) in order to investigate surface modifications caused by erosion and re-deposition processes. Three different materials have been selected: mono-crystalline molybdenum (mc-Mo), polycrystalline stainless steel (SS) and copper (Cu). The mc-Mo samples showed after TS exposure almost no surface roughness modifications and the lowest net-erosion. A slight reflectivity reduction, most pronounced in the near UV, is attributed to light absorption in a thin carbon deposit. Cu mirrors showed by far the highest surface roughness, erosion and diffusive reflectivity. Comparative laboratory glow discharge experiments with virgin reference samples and numerical simulations of erosion/deposition confirm the dominant contribution of conditioning procedures to erosion of mirrors exposed (without shutter protection) in Tore Supra. (c) 2005 Elsevier B.V. All rights reserved.
Keyword(s): J ; first mirrors (auto) ; mirror erosion and re-deposition (auto) ; Tore Supra mirror exposure (auto)
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