Deuterium retention in porous vacuum plasma-sprayed tungsten coating exposed to low-energy, high-flux pure and helium-seeded D plasmas

• Published in: Journal of nuclear materials 2011-08, Vol.415 (1), p.S628-S631
• Main Authors: Alimov, V.Kh, Tyburska, B., Ogorodnikova, O.V., Roth, J., Isobe, K., Yamanishi, T.
• Format: Article
• Language: English
• Subjects: Applied sciences; Coating; Controled nuclear fusion plants; Deuterium; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fission nuclear power plants; Fuels; Installations for energy generation and conversion: thermal and electrical energy; Micrometers; Nuclear fuels; Nuclear reactions; Nucleation; Plasmas; Thermal desorption spectroscopy; Tungsten
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/j.jnucmat.2010.08.054

Deuterium retention in porous vacuum plasma-sprayed tungsten coating has been examined after exposure to low-energy, high-flux (1022D/m2s) pure D and helium-seeded D plasmas to ion fluences in the range from 1026 to 1027D/m2 at various temperatures. The methods used were thermal desorption spectroscopy and the D(3He,p)4He nuclear reaction, allowing determination of the D concentration at depths up to 7μm. Under exposure to pure D plasma (76eV D2+) at 340–560K, the D concentration reaches 0.1–0.2at.% at depths of several micrometers, while at temperatures above 700K the D concentration is below 10−2at.% and deuterium is retained over the whole thickness of the coating. Seeding of 76eV He+ into the D plasma reduces the D retention at temperatures of 400–600K. However, at temperatures above 700K, the D retention becomes comparable to that for pure D plasma exposure.