American Nuclear Society
Home

Home / Publications / Journals / Fusion Science and Technology / Volume 41 / Number 3P2

Release of Hydrogen Isotopes from Boron Coated Carbon Tiles of JT-60U

Kaname Kizu, Junichi Yagyu, Yoshitaka Gotoh, Takashi Arai, Naoyuki Miya

Fusion Science and Technology / Volume 41 / Number 3P2 / May 2002 / Pages 907-911

Material Interaction and Permeation / Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001

Hydrogen isotope release properties of boron coated carbon tiles from JT-60U were investigated through secondary ion mass spectroscopy (SIMS). X-ray photoelectron spectroscopy (XPS) analysis of boron layer made by He+B10D14 method with 43 nm in thickness showed that the B/(B+C) ratio was about 0.9. Hydrogen isotopes in the boron layer and in the carbon layer were released at above 573 K and 1023 K, respectively. This means that hydrogen isotopes in the boron layer on the carbon tiles in JT-60U are released at temperatures as low as 573 K. The He+B10D14 boronization method is clearly effective to attain the high purity deuterium plasma and the low recycling because this method does not introduce H during boronization process. Wall conditioning before boronization is important because hydrogen retained in the carbon is released during plasma discharge through boron coating.

 
Questions or comments about the site? Contact the ANS Webmaster.
advertisement