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.

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Abstract-The next generation of superconducting magnets for the interaction regions of particle colliders, as well as for fast cycled accelerators, will be confronted with large heat loads. In order to improve the evacuation of heat from the Nb-Ti coil towards He-II bath, a porous (enhanced) all-polyimide cable insulation scheme was proposed recently. The first results were promising, featuring a larger permeability to helium with respect to existing schemes under low compressive stress. In this paper we present an extended experimental study of heat transfer through the Enhanced Insulation into He-II bath, and comparison to the standard LHC insulation, at different levels of applied pressure. The thermal coupling between adjacent cables was investigated, as well as the impact of a localized heat deposition versus a distributed one. The results of this study show that, up to high pressure levels, the enhanced insulation scheme can provide a major improvement of heat transfer compared to the standard scheme used in the main LHC magnets.Index Terms-Accelerator superconducting magnets, enhanced heat transfer, LHC upgrade phase I, porous cable insulation.

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The key objective of the Superconducting High Field Magnet work package of the European Project EuCARD, and specifically of the High Field Model task, is to design and fabricate the Nb3Sn dipole magnet FRESCA2. With an aperture of 100 mm and a target bore field of 13 T, the magnet is aimed at upgrading the FRESCA cable test facility at CERN. The design features four 1.5 m long double-layer coils wound with a 21 mm wide cable. The windings are contained in a support structure based on a 65 mm thick aluminum shell pre-tensioned with bladders. In order to qualify the assembly and loading procedure and to validate the finite element stress computations, the structure will be assembled around aluminum blocks, which replace the superconducting coils, and instrumented with strain gauges. In this paper, we report on the status of the assembly and we update on the progress on design and fabrication of tooling and coils. With an aperture of 100 mm and a target bore field of 13 T, the magnet is aimed at upgrading the FRESCA cable test facility at CERN. The design features four 1.5 m long double-layer coils wound with a 21 mm wide cable. The windings are contained in a support structure based on a 65 mm thick aluminum shell pre-tensioned with bladders. In order to qualify the assembly and loading procedure and to validate the finite element stress computations, the structure will be assembled around aluminum blocks, which replace the superconducting coils, and instrumented with strain gauges. In this paper, we report on the status of the assembly and we update on the progress on design and fabrication of tooling and coils.