Surface erosion and modification of toughened, fine-grained, recrystallized tungsten exposed to TEXTOR edge plasma

Ueda, Y.; Litnovsky, A.; Coenen, J. W.; Lee, H. T.; Hamaji, Y.; Philipps, V.; Kreter, A.; Oya, M.; Kurishita, H.; Yoshida, N.; Torikai, Y.

doi:10.1088/0031-8949/2014/T159/014038

Journal Article

FZJ-2015-00126

Surface erosion and modification of toughened, fine-grained, recrystallized tungsten exposed to TEXTOR edge plasma

Ueda, Y. (Corresponding Author) ; Oya, M. ; Hamaji, Y. ; Lee, H. T. ; Kurishita, H. ; Torikai, Y. ; Yoshida, N. ; Kreter, A.FZJ* ; Coenen, J. W.FZJ* ; Litnovsky, A.FZJ* ; Philipps, V.FZJ*

2014
IoP Publ. Bristol

Physica scripta T159, 014038 (2014) [10.1088/0031-8949/2014/T159/014038]

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Please use a persistent id in citations: doi:10.1088/0031-8949/2014/T159/014038

Abstract: In order to evaluate the applicability of toughened, fine-grained, recrystallized (TFGR)-W to tokamak edge plasma environment, two TFGR-W specimens (TFGR-W 1.1wt%TiC and TFGR-W 3.3wt%TaC) were exposed to 31 identical ohmic discharges in the TEXTOR tokamak by means of a limiter lock system. The highest surface temperature reached was about 1300 °C. Under these temperature conditions, the bulk microstructure and dispersoids distribution of both TFGR-W remained intact, suggesting that these TFGR-W tungsten materials have sufficient stability under these plasma loading conditions. The erosion of TiC dispersoids on the surface was enhanced by plasma exposure above 1150 °C, while such enhanced erosion was not observed for TaC dispersoids probably due to the higher melting temperature of Ta than Ti.

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