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The effect of inert gas pre-irradiation on the retention of deuterium in tungsten: A TMAP investigation combined with first-principles method.
- Source :
-
Fusion Engineering & Design . Oct2017, Vol. 121, p342-347. 6p. - Publication Year :
- 2017
-
Abstract
- Thermal desorption of deuterium in tungsten pre-irradiated with the inert gas (helium, neon, argon) is modelled by TMAP (Tritium Migration & Analysis Program). Each TMAP model incorporates three activation energies linked with three types of traps respectively. First-principles method is performed to calculate the activation energies of deuterium detrapping from different kinds of defects. By comparing the activation energies modelled in TMAP with that obtained from first-principles method, the types of traps are determined. The pre-irradiation of helium can suppress the deuterium retention in vacancy clusters. Neon and argon pre-irradiation suppresses deuterium retention in mono-vacancies due to decreasing the number of mono-vacancies caused by the occupation of the inert gas atoms into mono-vacancies. The pre-irradiation of neon can facilitate deuterium retention in vacancy clusters through generating vacancy clusters during the injection process. Argon pre-irradiation facilitates deuterium retention mainly through generating voids, which are of a larger scale than vacancy clusters and can serve as effective traps. [ABSTRACT FROM AUTHOR]
- Subjects :
- *IRRADIATION
*DEUTERIUM compounds
*TUNGSTEN
*HYDROGEN isotopes
*DEUTERATION
Subjects
Details
- Language :
- English
- ISSN :
- 09203796
- Volume :
- 121
- Database :
- Academic Search Index
- Journal :
- Fusion Engineering & Design
- Publication Type :
- Academic Journal
- Accession number :
- 124877956
- Full Text :
- https://doi.org/10.1016/j.fusengdes.2017.04.120