Experiments: session 1 Summary

The European Strategy for Particle Physics (ESPP) has recently recommended the exploitation of the full potential of the LHC, including the high-luminosity upgrade of the machine and detectors. Given this, the physics motivation for the upgrades is outlined. The limitations of the present detectors given the proposed medium term upgrades are recalled. The proposed HL-LHC performance parameters together with these detector limitations motivate the need for major upgrades. The required detector upgrades as foreseen at present are briefly sketched. Despite the upgrades the HL-LHC parameter space remains challenging and possible mitigation measures are discussed. The requirements of ALICE and LHCb in the HL-LHC era are presented. Finally an attempt is made to sketch the long-term LHC schedule given the known constraints in the lead-up to the HL-LHC upgrades.