Characteristic of a pdCu membrane as atomic hydrogen probe for QUEST. (December 2016)

• Record Type: Journal Article
• Authors: Onaka, Masayuki; Takagi, Ikuji; Kobayashi, Taishi; Sasaki, Takayuki; Kuzmin, Arseniy; Zushi, Hideki
• Is Part Of: Nuclear materials and energy. Volume 9(2016)
• Page Start: 104
• Page End: 108
• Publication Date: 2016-12
• Subjects: Palladium alloy -- Permeation -- Hydrogen -- Nuclear reaction analysis -- Plasma-wall interaction -- Diffusion; Nuclear energy -- Periodicals; Nuclear fuels -- Periodicals; Nuclear reactors -- Materials -- Periodicals; Radioactive substances -- Periodicals; 621.4833
• DOI: 10.1016/j.nme.2016.09.001
• Languages: English
• ISSNs: 2352-1791

Abstract

Abstract: A permeation probe is a useful device for detecting the atomic hydrogen flux to plasma-facing walls. Recently, we developed a new type of probe using 60Pd-40Cu alloy (PdCu) as the permeation material. The deuterium behaviors in PdCu samples were investigated using nuclear reaction analysis (NRA) and permeation observations, and the diffusion coefficient and recombination coefficients were determined from these observations. It was found that the sensitivity of a 0.02-mm-thick probe was as high as 0.5 below 473 K and was independent of the incident flux. The response time at 473 K was 0.41 s and 1.3 s under an incident flux of 10 20 m −2 s −1 and 10 19 m −2 s −1, respectively. Thus, we concluded that the new PdCu probe can effectively detect the incident atomic hydrogen with high sensitivity and a suitable response time.