On hydrogen transport in the first wall material of fusion devices in the presence of a broadband distribution of traps over the trapping energy

Autor: Sergei Krasheninnikov, E.D. Marenkov
Rok vydání: 2014
Předmět:
Zdroj: Physics Letters A. 378:1526-1530
ISSN: 0375-9601
DOI: 10.1016/j.physleta.2014.04.002
Popis: The dynamics of hydrogen dissolved in a sample with continuous distribution of traps over trapping energy φ ( e ) ∝ exp ( − α e ) ( e = E / T is the ratio of trapping energy E to the sample's temperature T) is considered. Assuming that the hydrogen density is smaller than the trap density and the most of hydrogen is trapped, we found that the dynamics of hydrogen transport can be described by either sub-diffusion or non-linear diffusion equations. Analysis of the outgassing of the sample homogeneously loaded with hydrogen gives, in the most important cases, both power-law, Γ H ∝ t − p ( p ≥ 1 / 2 ) and exponential, ln ( Γ H ) ∝ − t α , time dependencies of the outgassing flux, Γ H ( t ) .
Databáze: OpenAIRE