Erosion and deposition effects on the vessel wall of TEXTOR-94
2001 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 290, 341-345 p.Article in journal (Refereed) Published
Two different sets of long term samples (LTS) were exposed in TEXTOR-94 at the liner with boronized and siliconized wall conditions. Measured erosion/deposition rates of the coating constituents were compared with sputtering rates calculated for pure elements. D-0-fluxes at the LTS locations were determined by the B2-EIRENE code. Over the whole liner, erosion of initial coatings by D-0 is observed. Boron erodes at a rate of 8.4 x 10(13) B cm(-2) s(-1),while silicon erodes at a rate of 5.6 x 10(13) Si cm(-2) s(-1), a factor of 1.5 lower than that of boron. With boronized walls, carbon atoms initially present in the a-C/B:D layers are eroded at a rate of 7.6 x 10(12) C cm(-2) s(-1), at the same time 1.7 x 10(12) (Fe + Cr + Ni) cm(-2) s(-1) are deposited. Compared to boronized conditions where carbon erodes, deposition of carbon (1.7 x 10(13) cm(-2) s(-1)) and of metals (3.8 x 10(12) cm(-2) s(-1) occurred during the Si campaign. Due to long time exposure at high wall temperature (350 degreesC), hydrogenic isotopes desorb; (D + H)/(B + C) and (D + H)/(Si + C) ratios degrade from originally similar to0.4 to similar to0.2.
Place, publisher, year, edition, pages
2001. Vol. 290, 341-345 p.
TEXTOR 94, plasma facing materials, erosion, deposition, boron, carbon, silicon, hydrogen, deuterium, coatings, tokamak
IdentifiersURN: urn:nbn:se:kth:diva-20470DOI: 10.1016/S0022-3115(00)00635-8ISI: 000167676700069OAI: oai:DiVA.org:kth-20470DiVA: diva2:339165
QC 201005252010-08-102010-08-10Bibliographically approved