Publication: PENETRATION, DIFFUSION AND TRAPPING OF DEUTERIUM IN TUNGSTEN UNDER EXPOSURE TO THERMAL ATOMIC BEAM
Дата
2016
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The present work focuses on a number of compelling fundamental science problems relevant to plasma-material interactions. Several theoretical approaches were used. Molecular dynamic (MD) model and binary collision code TRIM were used to define the reflection coefficient and penetration depth of atomic and low-energy deuterium in tungsten. Rate equation theory and analytical model were used for the description of the deuterium penetration, diffusion and trapping in tungsten. An analytical expression for the rate of migration and trapping of hydrogen isotopes in a metal was derived. Using this expression, experimentally observed dependences of accumulation of the atomic and low-energy deuterium in tungsten on the incident energy, ion flux and temperature were explained. The calculations of the deuterium diffusion with trapping at radiation-induced defects in tungsten by analytical model are consistent with numerical calculations using rate-equation model. MD calculations show an agreement with a binary collision code TRIM only in a very narrow range of deuterium energies between 1 and 20 eV. Incorporation of the data of reflection and penetration of deuterium in the macroscopic modelling has been done to verify the range of validity of calculations using molecular dynamic MD and binary collision code TRIM by comparison of modelling results with experimental data. Modelling results are consistent with experiments using reflection and penetration data obtained from TRIM code for deuterium incident energy above 1 eV. Otherwise, the parameters obtained from MD should be incorporated in the rate-equation model to have a good agreement with the experiments. The present model allows us to understand interaction of thermal atomic deuterium beam with tungsten and validate reflection coefficient and mean projective range obtained by TRIM and MD calculations against experiments.
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OGORODNIKOVA O. V. PENETRATION, DIFFUSION AND TRAPPING OF DEUTERIUM IN TUNGSTEN UNDER EXPOSURE TO THERMAL ATOMIC BEAM [Текст.] / OGORODNIKOVA O. V., MARKELJ S., VON TOUSSAINT U.// Взаимодействие плазмы с поверхностью: сборник научных трудов XIX конференции. - 2016. - С. 107