Regime diagram of plasma-driven hydrogen transport through metals

Abstract

Hydrogen transport through plasma-facing materials has been analysed. By comparing permeation fluxes limited to different regimes, six transport parameters are identified; these are coupled to distinguish the regimes of plasma-driven permeation of hydrogen in the steady state. Regime diagrams and subregime diagrams are obtained, 14 sets of regime diagrams being present in all. There are two RR areas, three RD areas, three DD areas and two DR areas in the subregime diagram (R indicating recombination, and D diffusion). The relative sizes of four permeation fluxes limited to different regimes are different in these ten areas.