Impact of temperature during He super(+) implantation on deuterium retention in tungsten, tungsten with carbon deposit and tungsten carbide

Temperature dependence on deuterium (D) retention for He super(+) implanted tungsten (W) was studied by thermal desorption spectroscopy (TDS) to evaluate the tritium retention behavior in W. The activation energies were evaluated using Hydrogen Isotope Diffusion and Trapping (HIDT) simulation code a...

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Bibliographic Details
Published in:Physica scripta 2016-02, Vol.2016 (167), p.14037-14041
Main Authors: Oya, Yasuhisa, Sato, Misaki, Li, Xiaochun, Yuyama, Kenta, Fujita, Hiroe, Sakurada, Shodai, Uemura, Yuki, Hatano, Yuji, Yoshida, Naoaki, Ashikawa, Naoko, Sagara, Akio, Chikada, Takumi
Format: Article
Language:English
Subjects:
Carbon
Deposits
Deuterium
Hydrogen isotopes
Implantation
Trapping
Tungsten
Tungsten carbide
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Summary:Temperature dependence on deuterium (D) retention for He super(+) implanted tungsten (W) was studied by thermal desorption spectroscopy (TDS) to evaluate the tritium retention behavior in W. The activation energies were evaluated using Hydrogen Isotope Diffusion and Trapping (HIDT) simulation code and found to be 0.55 eV, 0.65 eV, 0.80 eV and 1.00 eV. The heating scenarios clearly control the D retention behavior and, dense and large He bubbles could work as a D diffusion barrier toward the bulk, leading to D retention enhancement at lower temperature of less than 430 K, even if the damage was introduced by He super(+) implantation. By comparing the D retention for W, W with carbon deposit and tungsten carbide (WC), the dense carbon layer on the surface enhances the dynamic re-emission of D as hydrocarbons, and induces the reduction of D retention. However, by He super(+) implantation, the D retention was increased for all the samples.
ISSN:0031-8949
1402-4896
DOI:10.1088/0031-8949/T167/1/014037