Hydrogen transport in solids with traps in the case of continuum distribution of detrapping energies
Tritium retention in the first wall material is one of the key issues in the performance of future fusion reactors. Transport of hydrogenic species in these materials is most commonly treated as diffusion affected by trapping/detrapping processes. Usually only several trap types differing in their a...
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Published in | Physica scripta Vol. T159; no. 1; pp. 14060 - 14064 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
IOP Publishing
01.04.2014
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Subjects | |
Online Access | Get full text |
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Summary: | Tritium retention in the first wall material is one of the key issues in the performance of future fusion reactors. Transport of hydrogenic species in these materials is most commonly treated as diffusion affected by trapping/detrapping processes. Usually only several trap types differing in their activation energies of hydrogen release are considered (up to three types in the TMAP7 code). We suggest that in some cases (e.g. highly damaged or disordered media) the hydrogen trapping/detrapping process is better characterized by a continuum distribution of traps over their detrapping energies. Within a random walk model we show that this assumption leads to qualitative changes in hydrogen transport in solids. Using this model we explain experimental findings on temporal dependence of deuterium outgassing from tokamaks, first wall. |
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Bibliography: | Royal Swedish Academy of Sciences |
ISSN: | 0031-8949 1402-4896 |
DOI: | 10.1088/0031-8949/2014/T159/014060 |