The new equipment for the High-Luminosity LHC requires civil engineering work to be undertaken on the sites of the ATLAS experiment in Meyrin, Switzerland (LHC Point 1) and the CMS experiment in Cessy, France (LHC Point 5).
On each site, the underground constructions will consist of:
- A shaft around 80 metres deep
- An underground service hall that will notably house cryogenics equipment
- A 300-metre-long tunnel for electrical equipment (power converters)
- Four tunnels measuring around 50 metres in length, connecting the new structures to the accelerator tunnel. These will house specific hardware, such as radiofrequency equipment.
On each site, the surface work consists of constructing five new buildings, representing a total surface area of 2800 m2. These will house the cooling and ventilation equipment, as well as electrical equipment. These buildings will be constructed outside the current site perimeters at Cessy and on a site made available by the Swiss Confederation at Meyrin.