Simultaneous irradiation effects of hydrogen and helium ions on tungsten

• Published in: Journal of nuclear materials Vol. 386; pp. 725 - 728
• Main Authors: Ueda, Y., Fukumoto, M., Yoshida, J., Ohtsuka, Y., Akiyoshi, R., Iwakiri, H., Yoshida, N.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 30-04-2009; Elsevier
• Subjects: Applied sciences; Blistering; Carbon; Channels; Controled nuclear fusion plants; Diffusion barriers; Diffusivity; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fission nuclear power plants; Fuels; Helium ions; Installations for energy generation and conversion: thermal and electrical energy; Irradiation; Nuclear fuels; Reduction; Tungsten; Helium ion; Carbon ion; Ion irradiation; Hydrogen; Tungsten; Diffusion barrier; Diffusion; Diffusivity; Nuclear reactor
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/j.jnucmat.2008.12.300

Simultaneous irradiation effects of He on tungsten blistering with hydrogen and carbon mixed ion irradiation were investigated. It was found that only 0.1% addition of He ions to 1
keV H and C mixed ion beam (C: 0.8–1.0%) reduced (473
K) or completely suppressed (653
K and 723
K) blister formation. According to TEM observation, He bubbles with the size of 2
nm or less were formed near the surface, which could be a diffusion barrier of hydrogen into the bulk due to the reduction of diffusion channel or excitation of stress field, leading to the reduction of diffusivity of hydrogen. The reduction rate of hydrogen inward flux by simultaneous He irradiation in our experimental conditions would be more than the factor of three.