A pulsed laser in the PISCES-B facility is used to simulate transient heating events such as ELMs and disruptions on W. The first study of enhanced nano-scale W tendril growth (''fuzz'') due to cyclic fast transient heating of W exposed to low energy (EHe+ 30 eV) He+ ions is presented. Fuzz due to transient heating is up to 10 thicker than the steady state fuzz thickness with no laser heating. A general thermal activation model yields higher values for the activation energy and pre-exponential factor than previously reported in steady state experiments with EHe+ 60 eV. Transient heating of W exposed to D plasma with Be seeding shows that the removal threshold of Be follows simple energy considerations based on the heat of formation of Be.
Yu, J. H., Baldwin, M. J., Doerner, R. P., Dittmar, T., Hakola, A., Höschen, T., Likonen, J., Nishijima, D., & Toudeshki, H. H. (2015). Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth. Journal of Nuclear Materials, 463, 299-302. https://doi.org/10.1016/j.jnucmat.2014.10.035