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Point 5 (LHC)
Point 5 (LHC) is a principal site within the Large Hadron Collider complex where major experiments, support facilities, and surface installations converge. It functions as a nexus linking underground caverns, access shafts, cryogenic plants, and experimental halls, integrating work by international collaborations and national laboratories. The site supports particle physics research, accelerator operations, and technology transfer involving numerous institutions and industrial partners.
Point 5 is one of the designated interaction and service points encircling the CERN ring that hosts flagship experiments and infrastructure. It serves as an operational hub for collaborations that include institutions such as ATLAS Collaboration, European Organization for Nuclear Research, FNAL, DESY, KEK, and national agencies like INFN and STFC. The site integrates cryogenics supplied by manufacturers like Air Liquide and Linde plc and interfaces with civil engineering contractors historically associated with projects for ITER and Large Electron–Positron Collider conversion works. Administratively, Point 5 involves coordination among entities such as European Commission funding arms, ERC grant holders, and university consortia from University of Oxford, University of Cambridge, École Polytechnique, and University of Tokyo.
Point 5 lies on the LHC circumference near the Geneva metropolitan boundary adjacent to the France–Switzerland border, sited among other points like Point 1 and Point 8 that host ATLAS and LHCb respectively. Surface infrastructures include administrative buildings, control rooms, and surface cryogenic stations analogous to facilities at Point 1 and CERN Meyrin site. Underground, Point 5 contains an access shaft, service caverns, and experimental galleries comparable to those at Point 2 (LHC) and Point 8 (LHC), connected by the LHC tunnel used by superconducting magnet strings manufactured by firms collaborating with Siemens and ABB. Logistics are supported by road access near Route de Meyrin and rail links historically used for component delivery, coordinated with customs authorities at Geneva Cornavin railway station for international shipments.
Point 5 hosts experimental infrastructure that supports detector maintenance, calibration, and data acquisition systems developed by teams from CERN member states and partner labs including Brookhaven National Laboratory and TRIUMF. Facilities include electronics workshops, cleanrooms modeled on those used for CMS and LIGO components, test benches for silicon sensors produced by manufacturers serving ATLAS and CMS, and radiation-shielded areas for activation studies akin to setups at ISOLDE. Computing and data links at Point 5 tie into the Worldwide LHC Computing Grid nodes and collaborate with centers such as CERN Data Centre, GRIDPP, and INFN-CNAF. Human resources training programs at Point 5 connect with academic partners like Imperial College London and ETH Zurich for doctoral and postdoctoral projects.
Within the accelerator complex, Point 5 functions as a service point for cryogenics, vacuum systems, and power distribution for adjoining LHC sectors, interacting operationally with the Super Proton Synchrotron, Proton Synchrotron Booster, and injector chains. It houses elements of the cold box systems that regulate helium refrigeration, analogous to installations at LHC Point 7 and coordinated with control systems developed by Siemens and software groups from CERN IT Department. Power infrastructure at Point 5 includes high-voltage substations and quench protection systems comparable to those implemented across sectors served by Toshiba and Schneider Electric. During runs, Point 5 operations are integrated into the LHC Control Centre sequencing and safety interlocks alongside input from experiments and the LHC Machine Committee.
The construction of Point 5 followed civil engineering precedents set during the transition from the Large Electron–Positron Collider to the LHC, with contract awards to joint ventures that had worked on projects like the Channel Tunnel and Gotthard Base Tunnel. Groundworks involved coordination with cantonal authorities and heritage offices near CERN Meyrin and followed environmental assessment procedures similar to those for ITER and ITER Organization sites. Fabrication of underground caverns used techniques proven on projects associated with Eurotunnel contractors and tunnelling companies experienced from Alpine tunnelling works. The commissioning phase linked Point 5 systems into LHC machine tests that paralleled milestone operations such as the first beam circulation and high-energy collisions documented in collaboration press releases by ATLAS Collaboration and CERN Directorate.
Planned upgrades at Point 5 align with LHC consolidation and High-Luminosity LHC initiatives coordinated by HiLumi LHC partners, aiming to augment cryogenic capacity, power converters, and radiation shielding in concert with groups like CERN Accelerator and Technology Sector and industrial partners such as Hitachi and Mitsubishi Electric. Upgrade programs reference experience from upgrade projects at Point 1 and Point 4 and involve procurement managed through frameworks similar to those used by the European Investment Bank for large infrastructure. Future plans envisage enhanced interfaces with European Grid Infrastructure centres and increased collaboration with detector R&D groups from CEA and Max Planck Society to support next-generation instrumentation.
Environmental and safety management at Point 5 follows CERN-wide protocols and national regulations enforced by authorities in Switzerland and France, including radiation protection frameworks used at ISOLDE and cryogenic safety procedures akin to those at ITER. Emergency response coordination involves local fire brigades such as Service de Protection et de Sauvetage de Genève and medical services linked with Hôpitaux Universitaires de Genève. Waste handling, contamination control, and biodiversity mitigation measures were implemented during construction in consultation with cantonal environmental offices and European environmental assessment practices exemplified by projects like EPR Flamanville and HS2 planning documents.