The research center, which primarily comprises an over 500-meter long proton accelerator, is actually a giant microscope that can photograph and film single atoms in many materials. The microscope operates by a process in which a target disc made of tungsten plays a central role. The research facility's center is therefore marked by a large circular roof above the hall, where the tungsten disc is located. Around the research center, campus consisting of laboratories, offices and teaching facilities, will be built focusing on healthy and efficient workplaces, and a world-class research environment. ESS is a pan-European project in which 17 countries participate.