Luis OS visited Prof. Tünde Fülop and Prof. Mattias Marklund at the Department of Physics at Chalmers University on 12th and 13th of September 2016 for discussions and collaboration on plasma-based accelerators, QED and relativistic astrophysics. He also delivered a seminar to the Department. On the photo, Luis OS with the hosts and with Prof. Chan Joshi, also visiting at the time.