ESS Bilbao is one of the main partners responsible COMPLEX for the design, manufacturing and commissioning of the key components SPANISH included at the ESS Target Station, the core of ENGINEERING the ESS infrastructure, the place where neutrons are created. These components have a direct impact FOR THE CORE on the number of neutrons that can be generated MACHINE OF and are therefore of the utmost importance for the future scientific capabilities of ESS. They require ESS electrical and instrumentation design and development to meet power, grounding, cable routing, monitoring, and controls requirements. ESS Bilbao Target Group, led by Raúl Vivanco as Project Manager is developing different work packages. 1 PROTON BEAM WINDOW PBW is the component that separates and confines the accelerator and target atmospheres in the 5MW pro ton beam path, evacuating the high energy released by it as a result of the nuclear interaction. The component consists of two 1mm 6061-T6 aluminium plates sepa rated by a cylindrical 2mm channel. The added value of this system consists in cooling around 5kW deposited by the proton beam while maintaining a temperature on the plates below 55ºC. Because Al6061 is a difficult material to weld, and due to the high manufacturing tolerances, to guarantee op timal manufacturing conditions, the PBW is designed avoiding any welding. The manufacturing process comProton Beam Window 10