A study on hydrogen isotopes transport in a liquid metal GaInSn by plasma-driven permeation method

作者：Bi Hailin^*; Hirooka Yoshi; Yagi Juro; Xu Yue

来源：Nuclear Materials and Energy, 2017, 12: 329-333.

DOI：10.1016/j.nme.2017.02.018

• Liquid metal
• Plasma-driven permeation
• Diffusivity
• Recombination coefficient
• Retention

The application of liquid metals such as gallium, tin and lithium as plasma-facing materials is a potential means to resolve the technical issues associated with power exhausting and particle handing in magnetic fusion devices. GaInSn alloy with melting point of 10.5 degrees C, is employed as a modeling material to explore the plasma-driven permeation (PDP) method to study the hydrogen isotopes (hydrogen and deuterium) transport parameters in a liquid metal. Static liquid GaInSn membranes sitting on a mesh sheet are exposed to hydrogen/deuterium plasmas in the linear plasma device VEHICLE-1 with the temperature range of 280-496 degrees C. Hydrogen/deuterium diffusivity are obtained by fitting the time evolutions of permeation fluxes. The dynamic hydrogen/deuterium retention in the liquid GaInSn are found to be low (similar to 1015 D/cm(3)), which are consistent with the thermal desorption spectroscopy (TDS) measurement following plasma exposure. The hydrogen and deuterium transport parameters are found to be close to each other.