Deuterium retention in tungsten exposed to low-energy pure and helium-seeded deuterium plasmas

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3505754· OSTI ID:21538009

Ogorodnikova, O V; Schwarz-Selinger, T; Sugiyama, K ^[1]; Alimov, V Kh ^[2]

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1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, D-85748 Garching (Germany)
2. Tritium Technology Group, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)

Influence of helium (He) on the deuterium (D) retention in tungsten (W) under simultaneous He-D plasma exposure was investigated. Bulk polycrystalline tungsten and two W coatings on carbon substrate, namely, plasma-sprayed tungsten and combined magnetron-sputtered and ion implanted tungsten (CMSII-W) were exposed to pure and He-seeded D plasmas generated by electron-cyclotron-resonance plasma source. The D retention in each sample was subsequently analyzed by various methods such as nuclear reaction analysis for the D depth profiling up to 6 {mu}m and thermal desorption spectroscopy for the determination of total amount of D retention. It is shown that seeding of helium into D plasma with helium ion flux fraction of 10% reduces the deuterium retention for all tungsten grades but more significant reduction was observed for polycrystalline W and less significant effect was found for W coatings. From the thermal desorption spectroscopy measurements, we conclude that the presence of He modifies the density of existing traps for D but does not modify the nature of traps. Maximum effect of a reduction in the deuterium retention due to helium seeding was observed at around 500 K for bulk polycrystalline W. Mechanisms of deuterium retention and He effect in different W materials are discussed.

• OSTI ID: 21538009
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 1; Other Information: DOI: 10.1063/1.3505754; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON
COATINGS
DENSITY
DESORPTION
DEUTERIUM
ELECTRON CYCLOTRON-RESONANCE
HELIUM
HELIUM IONS
ION IMPLANTATION
NUCLEAR REACTION ANALYSIS
PLASMA
POLYCRYSTALS
RETENTION
SPECTROSCOPY
SUBSTRATES
TRAPS
TUNGSTEN
WALL EFFECTS
CHARGED PARTICLES
CHEMICAL ANALYSIS
CRYSTALS
CYCLOTRON RESONANCE
ELEMENTS
FLUIDS
GASES
HYDROGEN ISOTOPES
IONS
ISOTOPES
LIGHT NUCLEI
METALS
NONDESTRUCTIVE ANALYSIS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PHYSICAL PROPERTIES
RARE GASES
REFRACTORY METALS
RESONANCE
SORPTION
STABLE ISOTOPES
TRANSITION ELEMENTS