LHC Detector Upgrades

Since the discovery of the Higgs boson in 2012, the LHC collaborations have been preparing to expand the exciting LHC physics program to include precise measurements of the properties of the Higgs and to search increasingly remote regions of phase space for signs of physics beyond the Standard Model. This very ambitious physics program will require a series of accelerator upgrades which will steadily increase the beam luminosity over the next decade to reach a total integrated luminosity of 350 fb−1 by 2022. At that time, the LHC will undergo a major upgrade to merit a new name: the High Luminosity LHC (HL-LHC), which is being designed to deliver five times the nominal LHC instantaneous luminosity and to provide for luminosity leveling. The final goal is to extend the data set to 3000 fb−1 by the 2030ties. Operation of the experiments with increasing rates and pile-up will become more challenging and performance degradations due to the high radiation dose will need to be addressed. ATLAS and CMS will therefore require substantial upgrades which will culminate in the complete replacement of their inner tracking systems by the start of the HL-LHC era in ∼2025. ALICE and LHCb do not require the LHC machine upgrades but limits set by constraints on their detectors will need to be overcome in order to increase their integrated luminosities. This presentation will provide an overview of this challenging program of the next two decades with focus on the major detector components and technological challenges.