Enhanced LIBS signal with small linewidth by electrical discharge assistance for application to hydrogen and deuterium line separation in plasma-surface interaction studies

The objective of this work is to precisely separate and enhance deuterium and hydrogen peaks using optimized laser-induced breakdown spectroscopy (LIBS) with glow discharge. This work utilized laser-induced breakdown spectroscopy (LIBS) in conjunction with Glow Discharge under different gas pressures, discharge voltages, and laser energy to differentiate deuterium and hydrogen peaks, which are often merged on tungsten samples as plasma-wall interactions in Tokamak reactors. To address this, we investigated tungsten peaks to determine the interaction between the glow discharge and the plasma plume. The results demonstrate a significant reduction in peak bandwidth and an increase in peak intensity. This enhancement is attributed to the minimization of peak broadening effects, including pressure and collisional broadening. The findings highlight the potential of optimized LIBS for precise isotopic analysis in fusion research.