European Organization for Nuclear Research
Organisation européenne pour la recherche nucléaire
Formation29 September 1954; 69 years ago (1954-09-29)[1]
HeadquartersMeyrin, Geneva, Switzerland
46°14′03″N 6°03′10″E / 46.23417°N 6.05278°E / 46.23417; 6.05278
Associate members (11):
Official languages
English and French
Council President
Eliezer Rabinovici[2]
Fabiola Gianotti
Budget (2022)
1405m CHF[3]

The European Organization for Nuclear Research, known as CERN (/sɜːrn/; French pronunciation: [sɛʁn]; Conseil européen pour la Recherche nucléaire), is an intergovernmental organization that operates the largest particle physics laboratory in the world. Established in 1954, it is based in Meyrin, western suburb of Geneva, on the France–Switzerland border. It comprises 23 member states.[4] Israel, admitted in 2013, is the only non-European full member.[5][6] CERN is an official United Nations General Assembly observer.[7]

The acronym CERN is also used to refer to the laboratory; in 2019, it had 2,660 scientific, technical, and administrative staff members, and hosted about 12,400 users from institutions in more than 70 countries.[8] In 2016, CERN generated 49 petabytes of data.[9]

CERN's main function is to provide the particle accelerators and other infrastructure needed for high-energy physics research – consequently, numerous experiments have been constructed at CERN through international collaborations. CERN is the site of the Large Hadron Collider (LHC), the world's largest and highest-energy particle collider.[10] The main site at Meyrin hosts a large computing facility, which is primarily used to store and analyze data from experiments, as well as simulate events. As researchers require remote access to these facilities, the lab has historically been a major wide area network hub. CERN is also the birthplace of the World Wide Web.[11][12]


The 12 founding member states of CERN in 1954[13]

The convention establishing CERN[14] was ratified on 29 September 1954 by 12 countries in Western Europe.[15] The acronym CERN originally represented the French words for Conseil Européen pour la Recherche Nucléaire ('European Council for Nuclear Research'), which was a provisional council for building the laboratory, established by 12 European governments in 1952. During these early years, the council worked at the University of Copenhagen under the direction of Niels Bohr before moving to its present site near Geneva. The acronym was retained for the new laboratory after the provisional council was dissolved, even though the name changed to the current Organisation Européenne pour la Recherche Nucléaire ('European Organization for Nuclear Research') in 1954.[16][17] According to Lew Kowarski, a former director of CERN, when the name was changed, the abbreviation could have become the awkward OERN,[18] and Werner Heisenberg said that this could "still be CERN even if the name is [not]".[19]

CERN's first president was Sir Benjamin Lockspeiser. Edoardo Amaldi was the general secretary of CERN at its early stages when operations were still provisional, while the first Director-General (1954) was Felix Bloch.[20]

The laboratory was originally devoted to the study of atomic nuclei, but was soon applied to higher-energy physics, concerned mainly with the study of interactions between subatomic particles. Therefore, the laboratory operated by CERN is commonly referred to as the European laboratory for particle physics (Laboratoire européen pour la physique des particules), which better describes the research being performed there.[citation needed]

Founding members

At the sixth session of the CERN Council, which took place in Paris from 29 June to 1 July 1953, the convention establishing the organization was signed, subject to ratification, by 12 states. The convention was gradually ratified by the 12 founding Member States: Belgium, Denmark, France, the Federal Republic of Germany, Greece, Italy, the Netherlands, Norway, Sweden, Switzerland, the United Kingdom, and Yugoslavia.[21]

Scientific achievements

Several important achievements in particle physics have been made through experiments at CERN. They include:

In September 2011, CERN attracted media attention when the OPERA Collaboration reported the detection of possibly faster-than-light neutrinos.[37] Further tests showed that the results were flawed due to an incorrectly connected GPS synchronization cable.[38]

The 1984 Nobel Prize for Physics was awarded to Carlo Rubbia and Simon van der Meer for the developments that resulted in the discoveries of the W and Z bosons.[39] The 1992 Nobel Prize for Physics was awarded to CERN staff researcher Georges Charpak "for his invention and development of particle detectors, in particular the multiwire proportional chamber". The 2013 Nobel Prize for Physics was awarded to François Englert and Peter Higgs for the theoretical description of the Higgs mechanism in the year after the Higgs boson was found by CERN experiments.

Computer science

See also: History of the Internet, History of the World Wide Web, and Protocol Wars

This NeXT Computer used by British scientist Sir Tim Berners-Lee at CERN became the first Web server.
This Cisco Systems router at CERN was one of the first IP routers deployed in Europe.
A plaque at CERN commemorating the invention of the World Wide Web by Tim Berners-Lee and Robert Cailliau

CERN pioneered the introduction of Internet technology, beginning in the early 1980s. This played an influential role in the adoption of the TCP/IP in Europe (see Protocol Wars).[40]

The World Wide Web began as a project at CERN initiated by Tim Berners-Lee in 1989. This stemmed from his earlier work on a database named ENQUIRE. Robert Cailliau became involved in 1990.[41][42][43][44] Berners-Lee and Cailliau were jointly honoured by the Association for Computing Machinery in 1995 for their contributions to the development of the World Wide Web.[45] A copy of the original first webpage, created by Berners-Lee, is still published on the World Wide Web Consortium's website as a historical document.[46]

Based on the concept of hypertext, the project was designed to facilitate the sharing of information between researchers. The first website was activated in 1991. On 30 April 1993, CERN announced that the World Wide Web would be free to anyone. It became the dominant way through which most users interact with the Internet.[47][48]

More recently, CERN has become a facility for the development of grid computing, hosting projects including the Enabling Grids for E-sciencE (EGEE) and LHC Computing Grid. It also hosts the CERN Internet Exchange Point (CIXP), one of the two main internet exchange points in Switzerland. As of 2022, CERN employs ten times more engineers and technicians than research physicists.[49]

Particle accelerators

Current complex

CERN Complex
Current particle and nuclear facilities
LHCAccelerates protons and heavy ions
LEIRAccelerates ions
SPSAccelerates protons and ions
PSBAccelerates protons
PSAccelerates protons or ions
Linac 3Injects heavy ions into LEIR
Linac4Accelerates ions
ADDecelerates antiprotons
ELENADecelerates antiprotons
ISOLDEProduces radioactive ion beams
MEDICISProduces isotopes for medical purposes
Map of the Large Hadron Collider together with the Super Proton Synchrotron at CERN

CERN operates a network of seven accelerators and two decelerators, and some additional small accelerators. Each machine in the chain increases the energy of particle beams before delivering them to experiments or to the next more powerful accelerator (the decelerators naturally decrease the energy of particle beams before delivering them to experiments or further accelerators/decelerators). Before an experiment is able to use the network of accelerators, it must be approved by the various Scientific Committees of CERN.[50] Currently (as of 2022) active machines are the LHC accelerator and:

Large Hadron Collider

Main article: Large Hadron Collider

Many activities at CERN currently involve operating the Large Hadron Collider (LHC) and the experiments for it. The LHC represents a large-scale, worldwide scientific cooperation project.[67]

CMS detector for LHC

The LHC tunnel is located 100 metres underground, in the region between Geneva International Airport and the nearby Jura mountains. The majority of its length is on the French side of the border. It uses the 27 km circumference circular tunnel previously occupied by the Large Electron–Positron Collider (LEP), which was shut down in November 2000. CERN's existing PS/SPS accelerator complexes are used to pre-accelerate protons and lead ions which are then injected into the LHC.

Eight experiments (CMS,[68] ATLAS,[69] LHCb,[70] MoEDAL,[71] TOTEM,[72] LHCf,[73] FASER[74] and ALICE[75]) are located along the collider; each of them studies particle collisions from a different aspect, and with different technologies. Construction for these experiments required an extraordinary engineering effort. For example, a special crane was rented from Belgium to lower pieces of the CMS detector into its cavern, since each piece weighed nearly 2,000 tons. The first of the approximately 5,000 magnets necessary for construction was lowered down a special shaft at 13:00 GMT on 7 March 2005.

The LHC has begun to generate vast quantities of data, which CERN streams to laboratories around the world for distributed processing (making use of a specialized grid infrastructure, the LHC Computing Grid). During April 2005, a trial successfully streamed 600 MB/s to seven different sites across the world.

The initial particle beams were injected into the LHC August 2008.[76] The first beam was circulated through the entire LHC on 10 September 2008,[77] but the system failed 10 days later because of a faulty magnet connection, and it was stopped for repairs on 19 September 2008.

The LHC resumed operation on 20 November 2009 by successfully circulating two beams, each with an energy of 3.5 teraelectronvolts (TeV). The challenge for the engineers was then to line up the two beams so that they smashed into each other. This is like "firing two needles across the Atlantic and getting them to hit each other" according to Steve Myers, director for accelerators and technology.

On 30 March 2010, the LHC successfully collided two proton beams with 3.5 TeV of energy per proton, resulting in a 7 TeV collision energy. However, this was just the start of what was needed for the expected discovery of the Higgs boson. When the 7 TeV experimental period ended, the LHC revved to 8 TeV (4 TeV per proton) starting March 2012, and soon began particle collisions at that energy. In July 2012, CERN scientists announced the discovery of a new sub-atomic particle that was later confirmed to be the Higgs boson.[78]

In March 2013, CERN announced that the measurements performed on the newly found particle allowed it to conclude that it was a Higgs boson.[79] In early 2013, the LHC was deactivated for a two-year maintenance period, to strengthen the electrical connections between magnets inside the accelerator and for other upgrades.

On 5 April 2015, after two years of maintenance and consolidation, the LHC restarted for a second run. The first ramp to the record-breaking energy of 6.5 TeV was performed on 10 April 2015.[80][81] In 2016, the design collision rate was exceeded for the first time.[82] A second two-year period of shutdown begun at the end of 2018.[83][84]

Accelerators under construction

As of October 2019, the construction is on-going to upgrade the LHC's luminosity in a project called High Luminosity LHC (HL–LHC). This project should see the LHC accelerator upgraded by 2026 to an order of magnitude higher luminosity.[85]

As part of the HL–LHC upgrade project, also other CERN accelerators and their subsystems are receiving upgrades. Among other work, the LINAC 2 linear accelerator injector was decommissioned and replaced by a new injector accelerator, the LINAC4.[86]

Decommissioned accelerators

Possible future accelerators

Main article: Future Circular Collider

CERN, in collaboration with groups worldwide, is investigating two main concepts for future accelerators: A linear electron-positron collider with a new acceleration concept to increase the energy (CLIC) and a larger version of the LHC, a project currently named Future Circular Collider.[103]


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CERN building 40 at the Meyrin site.
Interior of office building 40 at the Meyrin site. Building 40 hosts many offices for scientists from the CMS and ATLAS collaborations.

The smaller accelerators are on the main Meyrin site (also known as the West Area), which was originally built in Switzerland alongside the French border, but has been extended to span the border since 1965. The French side is under Swiss jurisdiction and there is no obvious border within the site, apart from a line of marker stones.

The SPS and LEP/LHC tunnels are almost entirely outside the main site, and are mostly buried under French farmland and invisible from the surface. However, they have surface sites at various points around them, either as the location of buildings associated with experiments or other facilities needed to operate the colliders such as cryogenic plants and access shafts. The experiments are located at the same underground level as the tunnels at these sites.

Three of these experimental sites are in France, with ATLAS in Switzerland, although some of the ancillary cryogenic and access sites are in Switzerland. The largest of the experimental sites is the Prévessin site, also known as the North Area, which is the target station for non-collider experiments on the SPS accelerator. Other sites are the ones which were used for the UA1, UA2 and the LEP experiments (the latter are used by LHC experiments).

Outside of the LEP and LHC experiments, most are officially named and numbered after the site where they were located. For example, NA32 was an experiment looking at the production of so-called "charmed" particles and located at the Prévessin (North Area) site while WA22 used the Big European Bubble Chamber (BEBC) at the Meyrin (West Area) site to examine neutrino interactions. The UA1 and UA2 experiments were considered to be in the Underground Area, i.e. situated underground at sites on the SPS accelerator.

Most of the roads on the CERN Meyrin and Prévessin sites are named after famous physicists, such as Wolfgang Pauli, who pushed for CERN's creation. Other notable names are Richard Feynman, Albert Einstein, and Bohr.

Participation and funding

Member states and budget

Since its foundation by 12 members in 1954, CERN regularly accepted new members. All new members have remained in the organization continuously since their accession, except Spain and Yugoslavia. Spain first joined CERN in 1961, withdrew in 1969, and rejoined in 1983. Yugoslavia was a founding member of CERN but quit in 1961. Of the 23 members, Israel joined CERN as a full member on 6 January 2014,[104] becoming the first (and currently only) non-European full member.[105]

The budget contributions of member states are computed based on their GDP.[106]

Member state Status since Contribution
(million CHF for 2019)
(fraction of total for 2019)
Contribution per capita[note 1]
(CHF/person for 2017)
Founding Members[note 2]
 Belgium 29 September 1954 30.7 2.68% 2.7
 Denmark 29 September 1954 20.5 1.79% 3.4
 France 29 September 1954 160.3 14.0% 2.4
 Germany 29 September 1954 236.0 20.6% 2.8
 Greece 29 September 1954 12.5 1.09% 1.6
 Italy 29 September 1954 118.4 10.4% 2.1
 Netherlands 29 September 1954 51.8 4.53% 3.0
 Norway 29 September 1954 28.3 2.48% 5.4
 Sweden 29 September 1954 30.5 2.66% 3.0
 Switzerland 29 September 1954 47.1 4.12% 4.9
 United Kingdom 29 September 1954 184.0 16.1% 2.8
 Yugoslavia[note 3] 29 September 1954[109][110] 0 0% 0.0
Acceded Members[note 4]
 Austria 1 June 1959 24.7 2.16% 2.9
 Spain[note 5] 1 January 1983[110][112] 80.7 7.06% 2.0
 Portugal 1 January 1986 12.5 1.09% 1.3
 Finland 1 January 1991 15.1 1.32% 2.8
 Poland 1 July 1991 31.9 2.79% 0.8
 Hungary 1 July 1992 7.0 0.609% 0.7
 Czech Republic 1 July 1993 10.9 0.950% 1.1
 Slovakia 1 July 1993 5.6 0.490% 1.0
 Bulgaria 11 June 1999 3.4 0.297% 0.4
 Israel 6 January 2014[104] 19.7 1.73% 2.7
 Romania 17 July 2016[113] 12.0 1.05% 0.6
 Serbia 24 March 2019[114] 2.5 0.221% 0.1
Associate Members in the pre-stage to membership
 Cyprus 1 April 2016[115] 1.0 N/A N/A
 Slovenia 4 July 2017[116][117] 1.0 N/A N/A
 Estonia 1 February 2021[118][119] 1.0 N/A N/A
Associate Members
 Turkey 6 May 2015[120] 5.7 N/A N/A
 Pakistan 31 July 2015[121] 1.7 N/A N/A
 Ukraine 5 October 2016[122] 1.0 N/A N/A
 India 16 January 2017[123] 13.8 N/A N/A
 Lithuania 8 January 2018[124] 1.0 N/A N/A
 Croatia 10 October 2019[125] 0.25 N/A N/A
 Latvia 2 August 2021[126] N/A N/A
 Brazil 13 March 2024[127] N/A N/A
Total Members, Candidates and Associates 1,171.2[106][128] 100.0% N/A
  1. ^ Based on the population in 2017.
  2. ^ 12 founding members drafted the Convention for the Establishment of a European Organization for Nuclear Research which entered into force on 29 September 1954.[107][108]
  3. ^ Yugoslavia left the organization in 1961.
  4. ^ Acceded members become CERN member states by ratifying the CERN convention.[111]
  5. ^ Spain was previously a member state from 1961 to 1969


Associate Members, Candidates:

International relations

Three countries have observer status:[136]

Also observers are the following international organizations:

Non-Member States (with dates of Co-operation Agreements) currently involved in CERN programmes are:[139][140]

CERN also has scientific contacts with the following other countries:[139][146]

International research institutions, such as CERN, can aid in science diplomacy.[147]

Associated institutions

ESO and CERN have a cooperation agreement.[148]

A large number of institutes around the world are associated to CERN through current collaboration agreements and/or historical links.[149] The list below contains organizations represented as observers to the CERN Council, organizations to which CERN is an observer and organizations based on the CERN model:


IntroducedAugust 13, 2014; 9 years ago (2014-08-13)
TLD typeGeneric top-level domain
Intended useDomains related to the European Organization for Nuclear Research
Actual useDomains related to the European Organization for Nuclear Research
Registration restrictionsDomain registrations only possible by CERN

.cern is a top-level domain for CERN.[157][158] It was registered on 13 August 2014.[159][160] On 20 October 2015, CERN moved its main Website to[161][162]

Open science

The Open Science movement focuses on making scientific research openly accessible and on creating knowledge through open tools and processes. Open access, open data, open source software and hardware, open licenses, digital preservation and reproducible research are primary components of open science and areas in which CERN has been working towards since its formation.

CERN has developed a number of policies and official documents that enable and promote open science, starting with CERN's founding convention in 1953 which indicated that all its results are to be published or made generally available.[14] Since then, CERN published its open access policy in 2014,[163] which ensures that all publications by CERN authors will be published with gold open access and most recently an open data policy that was endorsed by the four main LHC collaborations (ALICE, ATLAS, CMS and LHCb).[164] The open data policy complements the open access policy, addressing the public release of scientific data collected by LHC experiments after a suitable embargo period. Prior to this open data policy, guidelines for data preservation, access and reuse were implemented by each collaboration individually through their own policies which are updated when necessary.[165][166][167][168] The European Strategy for Particle Physics, a document mandated by the CERN Council that forms the cornerstone of Europe's decision-making for the future of particle physics, was last updated in 2020 and affirmed the organisation's role within the open science landscape by stating: "The particle physics community should work with the relevant authorities to help shape the emerging consensus on open science to be adopted for publicly-funded research, and should then implement a policy of open science for the field".[169]

Beyond the policy level, CERN has established a variety of services and tools to enable and guide open science at CERN, and in particle physics more generally. On the publishing side, CERN has initiated and operates a global cooperative project, the Sponsoring Consortium for Open Access Publishing in Particle Physics, SCOAP3, to convert scientific articles in high-energy physics to open access. Currently, the SCOAP3 partnership represents 3000+ libraries from 44 countries and 3 intergovernmental organizations who have worked collectively to convert research articles in high-energy physics across 11 leading journals in the discipline to open access.[170][171]

Public-facing results can be served by various CERN-based services depending on their use case: the CERN Open Data portal,[172] Zenodo, the CERN Document Server,[173] INSPIRE and HEPData[174] are the core services used by the researchers and community at CERN, as well as the wider high-energy physics community for the publication of their documents, data, software, multimedia, etc. CERN's efforts towards preservation and reproducible research are best represented by a suite of services addressing the entire physics analysis lifecycle (such as data, software and computing environment). CERN Analysis Preservation[175] helps researchers to preserve and document the various components of their physics analyses; REANA (Reusable Analyses)[176] enables the instantiating of preserved research data analyses on the cloud.

All of the abovementioned services are built using open source software and strive towards compliance with best effort principles where appropriate and where possible, such as the FAIR principles, the FORCE11 guidelines and Plan S, while at the same time taking into account relevant activities carried out by the European Commission.[177]

Public exhibits

The Globe of Science and Innovation at CERN

The CERN Science Gateway, opened in October 2023,[178] is CERN's latest facility for science outreach and education. It is home to a range of immersive exhibits, workshops, and shows.

The Globe of Science and Innovation, which opened in late 2005, is open to the public. It is used four times a week for special exhibits.

The Microcosm museum previously hosted another on-site exhibition on particle physics and CERN history. It closed permanently on 18 September 2022, in preparation for the installation of the exhibitions in Science Gateway.[179]

CERN also provides daily tours to certain facilities such as the Synchro-cyclotron (CERNs first particle accelerator) and the superconducting magnet workshop.

In 2004, a two-meter statue of the Nataraja, the dancing form of the Hindu god Shiva, was unveiled at CERN. The statue, symbolizing Shiva's cosmic dance of creation and destruction, was presented by the Indian government to celebrate the research center's long association with India.[180] A special plaque next to the statue explains the metaphor of Shiva's cosmic dance with quotations from physicist Fritjof Capra:

Hundreds of years ago, Indian artists created visual images of dancing Shivas in a beautiful series of bronzes. In our time, physicists have used the most advanced technology to portray the patterns of the cosmic dance. The metaphor of the cosmic dance thus unifies ancient mythology, religious art and modern physics.[181]

Arts at CERN

CERN launched its Cultural Policy for engaging with the arts in 2011.[182][183] The initiative provided the essential framework and foundations for establishing Arts at CERN, the arts programme of the Laboratory.

Since 2012, Arts at CERN has fostered creative dialogue between art and physics through residencies, art commissions, exhibitions and events. Artists across all creative disciplines have been invited to CERN to experience how fundamental science pursues the big questions about our universe.

Even before the arts programme officially started, several highly regarded artists visited the Laboratory, drawn to physics and fundamental science. As early as 1972, James Lee Byars was the first artist to visit the Laboratory and the only one, so far, to feature on the cover of the CERN Courier.[184] Mariko Mori,[185] Gianni Motti,[186] Cerith Wyn Evans,[187] John Berger[188] and Anselm Kiefer[189] are among the artists who came to CERN in the years that followed.

The programmes of Arts at CERN are structured according to their values and vision to create bridges between cultures. Each programme is designed and formed in collaboration with cultural institutions, other partner laboratories, countries, cities and artistic communities eager to connect with CERN's research, support their activities, and contribute to a global network of art and science.

They comprise research-led artistic residencies that take place on-site or remotely. More than 200 artists from 80 countries have participated in the residencies to expand their creative practices at the Laboratory, benefiting from the involvement of 400 physicists, engineers and CERN staff. Between 500 and 800 applications are received every year. The programmes comprise Collide, the international residency programme organised in partnership with a city; Connect, a programme of residencies to foster experimentation in art and science at CERN and in scientific organisations worldwide in collaboration with Pro Helvetia, and Guest Artists, a short stay for artists to stay to engage with CERN's research and community.[190][191]

In popular culture

The statue of Shiva engaging in the Nataraja dance (symbolizing his cosmic dance of creation and destruction) presented by the Department of Atomic Energy of India
Geneva tram 18 at CERN

See also


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