Laser-based wall diagnostics of LIAS and LIBS for the plasma wall interaction study on the EAST tokamak

The PWI at the first wall in fusion reactors is critical for the life time of plasma-facing components (PFC) and tokamak safety. There is an urgent need to measure PWI processes in situ. Two laser-based diagnostics of laser-induced breakdown/ablation spectroscopy (LIBS and LIAS) were successfully developed for the plasma wall interaction of fuel retention, material deposition and transport study on EAST tokamak. The LIBS was applied for the daily routinely monitoring the first wall compositions. The dedicated LIAS experiment on graphite and tungsten during limited and divertor discharge indicate that LIAS is suitable for the dynamic measurements of first wall condition in EAST tokamak. (author)