Deuterium retention in tungsten exposed to low-energy pure and helium-seeded deuterium plasmas
- Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, Boltzmannstr. 2, D-85748 Garching (Germany)
- 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, Journal Name: Journal of Applied Physics Journal Issue: 1 Vol. 109; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON
CHARGED PARTICLES
CHEMICAL ANALYSIS
COATINGS
CRYSTALS
CYCLOTRON RESONANCE
DENSITY
DESORPTION
DEUTERIUM
ELECTRON CYCLOTRON-RESONANCE
ELEMENTS
FLUIDS
GASES
HELIUM
HELIUM IONS
HYDROGEN ISOTOPES
ION IMPLANTATION
IONS
ISOTOPES
LIGHT NUCLEI
METALS
NONDESTRUCTIVE ANALYSIS
NONMETALS
NUCLEAR REACTION ANALYSIS
NUCLEI
ODD-ODD NUCLEI
PHYSICAL PROPERTIES
PLASMA
POLYCRYSTALS
RARE GASES
REFRACTORY METALS
RESONANCE
RETENTION
SORPTION
SPECTROSCOPY
STABLE ISOTOPES
SUBSTRATES
TRANSITION ELEMENTS
TRAPS
TUNGSTEN
WALL EFFECTS