The High-Luminosity LHC (HL-LHC) is a novel configuration of the Large Hadron Collider, aiming at increasing the luminosity by a factor five, or more, above the nominal LHC design, to allow increasing the integrated luminosity, in the high-luminosity experiments ATLAS and CMS, from the 300 fb−1 of the LHC original design up to 3000 fb−1 or more. This paper contains a short description of the main machine parameters and of the main equipment that need to be developed and installed. Preliminary cost, international collaboration and project governance are discussed, too.
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