The Large Hadron Collider (LHC) at CERN is the highest priority of the particle physics community, and will be used to make progress in research into the smallest building blocks of matter. The physicists at the IIHE have been active since the beginning of the 1990s when first designing and constructing the CMS detector near the LHC, up to today maintaining this experiment and conducting fundamental research. From 2026, the High-Luminosity LHC phase begins, with even more collisions and requiring an upgraded CMS detector. Within the international collaboration, the Belgian institutions (including the IIHE) take the lead in building a forward Silicon Tracker Endcap. This is essential for the research and corresponds to our expected contribution to the construction of this new CMS detector.