LHC Run 3 Configuration Working Group Report

After its second successful run period, the Large Hadron Collider (LHC) [1] shuts down for two years with the plan of being recommissioned in 2021 for a three-year physics production period, the Run 3. The future restart of the LHC coincides with the completion of the LHC Injectors Upgrade (LIU) project [2], offering to the LHC the opportunity and the challenge to operate with up to two times higher beam brightness. For this purpose, the LHC Run 3 Configuration Working Group (LCR3) was formed to identify the limitations on the various LHC systems, and seek possible mitigations or constraints in terms of the accepted beam parameters. The LCR3 is in charge of establishing operational scenarios and estimating them in terms of their integrated performance. These proceedings summarize the status of the working group, highlight the known constraints and suggest a preliminary version of the LHC cycle in Run 3.