Mitigated blistering and deuterium retention in tungsten exposed to high-flux deuterium–neon mixed plasmas. (10th March 2017)

• Record Type: Journal Article
• Authors: Cheng, L.; De Temmerman, G.; Morgan, T.W.; Schwarz-Selinger, T.; Yuan, Y.; Zhou, H.B.; Wang, B.; Zhang, Y.; Lu, G.H.
• Is Part Of: Nuclear fusion. Volume 57:Number 4(2017:Apr.)
• Publication Date: 2017-03-10
• Subjects: deuterium retention -- neon -- tungsten -- plasma–material interaction; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/aa5c5c
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Surface morphology and deuterium retention in tungsten exposed at surface temperature of ~550 K to mixed deuterium–neon plasmas of different neon concentrations are investigated. It is found that the addition of neon up to 20% mitigates blistering on the surface. Cross-section view of the surface shows the formation of pores near the surface in the depth less than 100 nm. Deuterium depth profile is featured by an enhanced deuterium concentration within a depth of 16 nm but a mitigated penetration in depth larger than 1 µ m. Deuterium retention is reduced by up to a factor of four. It is suggested the open pores formed in the surface serves as an escaping channel, mitigates deuterium penetration towards bulk and retention in the bulk.