CERN surveyors have just finalised a system that can determine, in real time, the position of certain components inside the (sealed) cryostats of the future High-Luminosity LHC (HL-LHC), CERN Updates.
Aligning the HL-LHC magnets with interferometry
Aligning the HL-LHC magnets with interferometry
Aligning the HL-LHC magnets with interferometry

A cryostat equipped with a laser head (Image: CERN)