While the LHC accelerator at CERN has been operating smoothly, the High-Luminosity LHC (HL-LHC) Upgrade Project, which has aimed at attaining a total integrated luminosity of 3000 fb-1 for about 10 years—a factor tenfold the design value of the present LHC—was planned in order to improve the statistical precision of physics results. To realize this ambitious target, a full upgrade of accelerator elements in the insertion regions for the ATLAS and CMS experiments is crucial. In particular, large-aperture superconducting magnets with a higher field and superconducting RF crab cavities hold the key to the success of the project. In this article, an overview of the HL-LHC and its relevant R&D efforts are introduced.
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