Structural and metallurgical effects in stainless steel for first-wall applications in simulated plasma distributions

This study presents experimental disruption simulation results using a pulsed high power laser beam with high energy density (0-20 MJ/cm2) and short pulse duration (0.2-20 ms) under vacuum conditions. Time-dependent profiles of the laser beam are given. The paper deals mainly with the European reference heat austenitic steel Type AISI 316L. The melting effects are quantified and compared with numerical predictions by a transient heat load code. The effects of repeated disruptions are analyzed. The extrapolation of experimental data obtained with small spots to predictions for larger areas is addressed. (orig.)