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Surface morphology and helium retention on tungsten exposed to low energy and high flux helium plasma

Surface morphology and helium retention on tungsten exposed to low energy and high flux helium plasma

Authors :
Toshiaki Sogabe
R.P. Doerner
Y. Kubota
Kazutoshi Tokunaga
B. Schedler
Toshihiko Kato
N. Noda
N. Yoshida
R. Seraydarian
Source :
Journal of Nuclear Materials. :92-96
Publication Year :
2003
Publisher :
Elsevier BV, 2003.

Abstract

Surface modification and helium retention on powder metallurgy tungsten and plasma sprayed tungsten coated CFC exposed by low energy (100 eV) high flux (3.83×10 21 –1.20×10 22 m −2 s −1 ) helium plasma have been investigated. Fluence is about 10 26 He m −2 . It is found that fine surface morphology change occurs by the helium exposure. There is little difference of the surface modification between the powder metallurgy tungsten and the plasma sprayed tungsten. In the case that the surface morphology do not changed, two helium desorption peak appeared. The amount of desorption of helium is larger than that of deuterium from tungsten under the same exposure condition by heating up to 1273 K by TDS. In the case that fine surface morphology change occurs, desorption peak at high temperature newly appears. Surface modification such as blister is not formed on the surface exposed to helium under the same exposure condition which the blister is formed by deuterium exposure.

Details

ISSN :
00223115
Database :
OpenAIRE
Journal :
Journal of Nuclear Materials
Accession number :
edsair.doi...........5f90c3404c43d7f82259b2cee1c716f7
Full Text :
https://doi.org/10.1016/s0022-3115(02)01362-4