Effects of helium implantation on hydrogen isotope retention behavior in SiC

Particle balance under global wall saturation in long-pulse discharges of JT-60U

“…On the assumption that the ratio of deuterium to carbon in the deposition layer is 0.05 [14], the net deposition rate of the hydrocarbon of 60% is necessary to explain the wall-pumping rate of 1.4 · 10 21 /s. However, this net deposition rate is higher than the rate calculated by the local carbon transport simulation code [15]. The net deposition rate should be investigated further experimentally, for example, by a QMB technique.…”

“…3(d), a net deposition rate of P60% is required to be assumed even if the outgassing rate is assumed to be zero. This assumed net deposition rate is too high compared with that calculated by the EDDY code [15], which simulates dynamic material erosion by chemical and physical sputtering, impurity transport on the background plasma for the real geometry of the JT-60 divertor determined by the UEDGE code, atomic and molecular processes, and local and prompt redeposition (reflection or sticking of impurity). Hence further deuterium retention mechanisms in addition to co-deposition are suggested.…”

Retention and thermal release behavior of deuterium and helium implanted in SiC

“…However, there has been little insight into the interactions between hydrogen and He in SiC, with the exception of a few reports [10,11] based on thermal desorption experiments. In this study, the retention and release behavior of hydrogen isotopes and He and the interaction between them in SiC single crystals were studied using ion beam analysis techniques.…”