Centre d'études et d'expertise sur les risques, l'environnement, la mobilité et l'aménagement

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The new European Strategy for Particle Physics, adopted by the special CERN Council of Brussels on 30 May 2013, placed HL-LHC as a first priority project for the next decade. Consequently, CERN management inserted the project in the Medium Term Plan (5-year plan) and a kick off meeting of HL-LHC as a construction project was organized in Daresbury on 11 November 2013. The HL-LHC project is accompanied by upgrade projects of all LHC Experiments and by the LHC Injector Upgrade Project (LIU). The Experiment upgrade projects are dealt with by their International Collaborations. The LIU project has a separate management, project structure and budget line and plans for a complete implementation during Long Shutdown 2 (LS2), by the end of 2020. The Experiments upgrade and LIU projects are not covered by this TDR.A Cost and Schedule Review series, reviewing both the HL-LHC and LIU projects and reporting to the CERN Director of Accelerators and Technology, Dr. Frédérick Bordry, started in March 2015, with C&SR-I. Following the very positive results of the review, the CERN management endorsed the cost and planning. In September 2015 the CERN Council approved the MTP 2016-2020, containing the funding for the project for that period and envisaging the full Cost-to-Completion (CtC) of the project by 2026. Finally in June 2016, the CERN management had the High Luminosity LHC project, i.e. the upgrade of the collider and its infrastructure, formally approved by the CERN Council, with full financing till 2026. The approved CtC is 950 MCHF of material budget in CERN accounting.In August 2016, a re-baselining of the HL-LHC project was approved by CERN management (and endorsed by the C&SR-II of October 2016) in order to keep the CtC ceiling while accommodating extra cost in the technical infrastructure (mainly in the civil engineering). The present TDR reflects the design of the project at the time of approval by the CERN council, June 2016, with the modifications introduced in the re-baselining exercise in summer 2016.The project leadership is particularly grateful to the CERN management for its continuous support and encouragement and in particular to the CERN Director of Accelerators and Technology, Dr. Frédérick Bordry for his continuous support and guidance from the beginning of the project, to former Director-General Dr. Rolf Heuer for his engagement in having the project initiated and started the funding during his mandate, as well as to the present Director-General Dr. Fabiola Gianotti, for having pursued and obtained the full approval of the entire HL-LHC project by the Council in June 2016, the first CERN project with such status after the LHC.