For hydrogen permeation measurements through rather impermeable metal membranes it is very challenging to suppress the hydrogen background outgassing flux to the level when it represents only a fraction of the permeation flux. The authors present an innovative thin-walled stainless steel permeation cell design that results in efficient hydrogen background suppression. When implemented in an all-metal UHV system, low permeation flux density of hydrogen down to j ~ 1E-9 mbar L/(cm2 s) could be measured on disk-shaped membranes having an area of 8.4 cm2
COBISS.SI-ID: 23733287
Be films will be applied in fusion reactors as the first wall tile coating in the near future. The morphology, adhesion and thermal stability of these thin films deposited by the thermionic vacuum arc (TVA) method have been confirmed to be excellent. Results of hydrogen permeation through 8 micrometer thick Be films deposited by the TVA method on Eurofer membranes are presented. The permeation flux was determined on five samples at 400°C and 1 bar hydrogen pressure. The permeation reduction factor (PRF) was between 83 and 15, respectively, compared to the uncoated Eurofer membrane.
COBISS.SI-ID: 24294951