On the lifetime of wall conditioning layers

JOURNAL OF NUCLEAR MATERIALS

卷:337

Article; Proceedings Paper

Maier, H ; Schmid, K ; Eckstein, W

关键词: boronization;    coating;    TRIM;    tungsten;    erosion;    deposition;   

DOI  :  10.1016/j.jnucmat.2004.10.062

来源: Elsevier

【 摘 要 】

Motivated by the large-scale application of tungsten as first wall material in the tokamak ASDEX Upgrade, we performed a numerical study about the erosion behaviour of boron films from carbon and tungsten substrates using the Monte-Carlo code TRIDYN. We compared the erosion caused by monoenergetic ions as well as the case of a plasma with a temperature of 10 eV containing boron as an impurity. In both cases we obtained, that on tungsten substrates a pure tungsten surface film is formed with some boron inventory buried underneath. For a carbon substrate, however, the boron inventory depletes slowly due to ion beam mixing effects in the case of monoenergetic ion bombardment. In the case of a thermal plasma containing boron as an impurity, an equilibrium boron surface concentration is established at high fluences. This boron concentration is strongly enhanced as compared to the boron impurity concentration in the plasma. (c) 2004 Elsevier B.V. All rights reserved.

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