This activity defines the engineering specifications of the interaction chamber for ignition experiments, addressing licensing, target manufacturing, diagnostics, and debris management. It also evaluates reactor wall and blanket materials, and optical components under irradiation, while developing models, innovative designs, and industrial pathways to ensure safe, reliable, and cost-effective operation. The assessment of different concepts of blanket and vacuum vessels for the Fusion Power Plant in IFE will be performed, including the evaluation of tritium breeding solutions. In this WP we’ll collaborate with companies and institutions working on targetry in Europe and able of providing foams, 3D printed structures, diamond shells, and other types of targets (e.g. UPNANO, Nanoscribe, Istituto Italiano di Tecnologia, Fraunhofer Institute, …) This work package concentrates on the engineering and materials science aspects of the fusion chamber and target systems.