Short-term retention in metallic PFCs: modelling in view of mass spectrometry and LIBS

Based on the conventional model of hydrogen retention in plasma-facing components, the question of hydrogen outgassing during and after plasma exposure is addressed in relation to mass spectrometry and laser-induced breakdown sprectroscopy (LIBS) measurements. Fundamental differences in retention and release data acquired by LIBS and by mass spectrometry are described analytically and by modelling. Reaction-diffusion simulations are presented that demonstrate possible thermal outgassing effects caused by LIBS. Advantages and limitations of LIBS as a tool for analysis of short term retention are discussed.

Automated summary

This study investigates the outgassing of hydrogen during and after plasma exposure using mass spectrometry and laser-induced breakdown spectroscopy measurements. Analytical and modeling approaches are used to describe the differences in retention and release data obtained by the two methods. Reaction-diffusion simulations demonstrate potential thermal outgassing effects caused by LIBS, and the advantages and limitations of LIBS for short-term retention analysis are discussed.