Osman El-Atwani¹, William Cunningham², Jason Trelewicz², Wei-Ying Chen³, Meimei Li³, Stuart Maloy¹; ¹Los Alamos National Laboratory, ²Stony Brook University, ³Argonne National Laboratory

Performing detailed morphology analysis of tungsten surfaces under dual beam irradiation and investigating the synergistic effects of the different energetic beams are decisive steps to evaluate tungsten performance as a plasma material interface (PMI) in a reactor-similar environment. Here, we test fine grain tungsten under in-situ sequential beam irradiation (heavy ion irradiation followed by helium implantation or helium implantation followed by heavy ion irradiation) and compare the results to dual beam irradiation (simultaneous heavy ion irradiation and helium implantation). Loop type and damage profiles including loop density, loop area and overall damage are presented as a function of dose in every case. Void damage is also presented at the final dose. The results are also compared to single beam irradiation. The synergistic effects of the different energetic beams are elucidated and the importance of dual beam irradiation as a testing protocol for PMI materials is illustrated.