The High-Luminosity Large Hadron Collider

The High-Luminosity LHC is a project to increase the luminosity of the Large Hadron Collider by a factor of 10 beyond its design value by 2020

The High-Luminosity Large Hadron Collider (HL-LHC) project aims to crank up the performance of the LHC in order to increase the potential for discoveries after 2025. The objective is to increase luminosity by a factor of 10 beyond the LHC’s design value.

Luminosity is an important indicator of the performance of an accelerator: it is proportional to the number of collisions that occur in a given amount of time. The higher the luminosity, the more data the experiments can gather to allow them to observe rare processes. The High-Luminosity LHC, which should be operational by 2025, will allow precise studies of the new particles observed at the LHC, such as the Higgs boson. It will allow the observation of rare processes that are inaccessible at the LHC’s current sensitivity level. For example, the High-Luminosity LHC will produce up to 15 million Higgs bosons per year, compared to the 1.2 million produced in 2011 and 2012.

The High-Luminosity LHC project was announced as the top priority of the European Strategy for Particle Physics in 2013 and its funding is enshrined in CERN’s Medium-Term Plan.

Its development depends on several technological innovations.  The first phase of the project began in 2011 with the “HiLumi LHC” design study, which was partly financed by the European Commission’s seventh framework programme (FP7). This first phase brought together many laboratories from CERN’s Member States, as well as from Russia, Japan and the United States. The institutes in the United States took part in the project thanks to the support of LARP (US LHC Accelerator Research Program), funded by the US Department of Energy.

The design study came to a close on 31 October 2015 with the publication of a technical design report, marking the start of the construction phase for the project at CERN and in industry.

CERN will devote 950 million CHF of its budget over a period of 10 years to the development of the High-Luminosity LHC.

(Image: Timeline for the LHC and High-Luminosity LHC)
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