This chapter summarizes the baseline parameters and layout for the HL-LHC machine, discusses options for alternatives to the baseline configurations, comments on the integration issues and describes the overall planning for the HL-LHC upgrade. HL-LHC Baseline ParametersThe performance of the HL-LHC machine is boxed in between the request for a high integrated luminosity (ca. 3000 fb 1by the end of the HL-LHC exploitation over ca. 10 years of operation and translating to an annual integrated luminosity of ca. 250 fb 1 assuming scheduled 160 days for proton physics production per year and that the HL-LHC exploitation starts with an integrated luminosity of ca. 300 fb 1at the end of the LHC Run III in 2022) and a maximum number of 140 events per bunch crossing. While the request for maximum integrated luminosity asks for the largest possible peak luminosity, the request for limited number of events per bunch crossing limits the peak luminosity to a maximum value of ca. 5·10 34 cm 2 s 1. Operating the HL-LHC with the maximum number of bunches and utilizing luminosity leveling provides the best compromise for satisfying both requests. Table 1 shows the resulting baseline parameters approved by the HL-LHC Layout and Parameter Committee [1] for the standard 25 ns bunch spacing configuration together with the parameters for the nominal LHC configuration and two alternative scenarios which might become interesting in case the LHC operation during Run II reveals problems either related to the * The project is partially supported by the EC as FP7 HiLumi LHC Design Study under grant no. 284404. In addition to the FP7-Hilumi LHC consortium, the Project relies on the special contributions by: USA (LARP), Japan (KEK), France (CEA), Italy (INFN-Milano and Genova) and Spain (CIEMAT).
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