This document describes the collaboration of Dr Jian Fuh Ong from Extreme Light Infrastructure for Nuclear Physics, (ELI-NP), Romania, and Associate Prof. Vasilis Dimitriou, from the Institute of Plasma Physics & Lasers – IPPL of the Hellenic Mediterranean University-HMU in Crete, Greece, which started under the HPC-Europa3 transnational access visit. This visit resulted to the establishment of a Memorandum of Understanding (MoU) between the two institutes which was motivated by the need of optimizing the high-power laser experiments. The collaborative research work also advanced the modeling and simulations by using Graphics Processing Units (GPUs). The HPC-Europa3 project provided a strong international link and activated the collaboration between the two groups.