For the company with the ticker symbol CERN, see Cerner. For the rocket nozzle, see SERN. European Organization for Nuclear Research Organisation Européenne pour la Recherche Nucléaire Member states Formation 29 September 19541 Headquarters Geneva, Switzerland Membership 20 member states and 8 observers Director General Rolf-Dieter Heuer Website http://www.cern.ch/ The 12 founding member states of CERN in 1954 a[›] (map borders from 1989) 54 years after its foundation, membership to CERN increased to 20 states, 18 of which are also EU members as of 2010 The European Organization for Nuclear Research (French: Organisation Européenne pour la Recherche Nucléaire), known as CERN (see History), pronounced /ˈsɜ:rn/ (French pronunciation: [sɛʁn]), is the world's largest particle physics laboratory, situated in the Northwest suburbs of Geneva on the Franco–Swiss border (46°14′3″N 6°3′19″E / 46.23417°N 6.05528°E / 46.23417; 6.05528), established in 1954. The organization has twenty European member states, and is the workplace of approximately 2,600 full-time employees, as well as some 7,931 scientists and engineers representing 580 universities and research facilities and 80 nationalities. CERN's main function is to provide the particle accelerators and other infrastructure needed for high-energy physics research. Numerous experiments have been constructed at CERN by international collaborations to make use of them. It is also the birthplace of the World Wide Web. The main site at Meyrin also has a large computer centre containing very powerful data-processing facilities primarily for experimental data analysis and, because of the need to make them available to researchers elsewhere, has historically been a major wide area networking hub. The CERN sites, as an international facility, are officially under neither Swiss nor French jurisdiction. Member states' contributions to CERN for the year 2008 totalled CHF 1 billion (approximately € 664 million).citation needed Contents 1 History 1.1 Scientific achievements 1.1.1 Computer science 2 Particle accelerators 2.1 Current complex 2.1.1 The Large Hadron Collider 2.2 Decommissioned accelerators 3 Sites 3.1 Financing (Budget 2009) 4 Member states 5 Public exhibits 6 In popular culture 7 See also 8 References 9 External links // History The convention establishing CERN was ratified on 29 September 1954 by 12 countries in Western Europe.a[›]1 The acronym CERN originally stood, in French, for Conseil Européen pour la Recherche Nucléaire (European Council for Nuclear Research), which was a provisional council for setting up the laboratory, established by 11 European governments in 1952. 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 1954.2 According to Lew Kowarski, a former director of CERN, when the name was changed the acronym could have become the awkward OERN, and Heisenberg said that the acronym could "still be CERN even if the name is [not]".citation needed

Soon after its establishment the work at the laboratory went beyond the study of the atomic nucleus into higher-energy physics, which is mainly concerned with the study of interactions between 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 at CERN. Scientific achievements Several important achievements in particle physics have been made during experiments at CERN. They include: 1973: The discovery of neutral currents in the Gargamelle bubble chamber.3 1983: The discovery of W and Z bosons in the UA1 and UA2 experiments.4 1989: The determination of the number of light neutrino families at the Large Electron–Positron Collider (LEP) operating on the Z boson peak. 1995: The first creation of antihydrogen atoms in the PS210 experiment.5 1999: The discovery of direct CP-violation in the NA48 experiment.6 2010: The isolation of 38 atoms of anti-hydrogen 7 The 1984 Nobel Prize in physics was awarded to Carlo Rubbia and Simon van der Meer for the developments that led to the discoveries of the W and Z bosons. The 1992 Nobel Prize in physics was awarded to CERN staff researcher Georges Charpak "for his invention and development of particle detectors, in particular the multiwire proportional chamber." Computer science See also: History of the World Wide Web This NeXT Computer used by British scientist Sir Tim Berners-Lee at CERN became the first Web server. The World Wide Web began as a CERN project called ENQUIRE, initiated by Tim Berners-Lee in 1989 and Robert Cailliau in 1990.8 Berners-Lee and Cailliau were jointly honored by the Association for Computing Machinery in 1995 for their contributions to the development of the World Wide Web. Based on the concept of hypertext, the project was aimed at facilitating sharing information among researchers. The first website went on-line in 1991. On 30 April 1993, CERN announced that the World Wide Web would be free to anyone. A copy9 of the original first webpage, created by Berners-Lee, is still published on the World Wide Web Consortium's website as a historical document. This Cisco Systems router at CERN was probably one of the first IP routers deployed in Europe. Prior to the Web's development, CERN had been a pioneer in the introduction of Internet technology, beginning in the early 1980s. A short history of this period can be found at CERN.ch.10 More recently, CERN has become a centre for the development of Grid computing, hosting among others the Enabling Grids for E-sciencE (EGEE) and LHC Computing Grid projects. It also hosts the CERN Internet Exchange Point (CIXP), one of the two main Internet Exchange Points in Switzerland. CERN's computer network is connected to JANET (formerly UKERNA), the research and education network, JANET aids CERN to disperse large data over a network grid for closer analysis. Particle accelerators Current complex Map of the Large Hadron Collider together with the Super Proton Synchrotron at CERN

CERN operates a network of six accelerators and a decelerator. Each machine in the chain increases the energy of particle beams before delivering them to experiments or to the next more powerful accelerator. Currently active machines are: Two linear accelerators generate low energy particles. Linac2 accelerates protons to 50 MeV for injection into the Proton Synchrotron Booster (PSB), and Linac3 provides heavy ions at 4.2 MeV/u for injection into the Low Energy Ion Ring (LEIR).11 The Proton Synchrotron Booster increases the energy of particles generated by the proton linear accelerator before they are transferred to the other accelerators. The Low Energy Ion Ring (LEIR) accelerates the ions from the ion linear accelerator, before transferring them to the Proton Synchrotron (PS). This accelerator was commissioned in 2005, after having been reconfigured from the previous Low Energy Antiproton Ring (LEAR). The 28 GeV Proton Synchrotron (PS), built in 1959 and still operating as a feeder to the more powerful SPS. The Super Proton Synchrotron (SPS), a circular accelerator with a diameter of 2 kilometres built in a tunnel, which started operation in 1976. It was designed to deliver an energy of 300 GeV and was gradually upgraded to 450 GeV. As well as having its own beamlines for fixed-target experiments (currently COMPASS and NA62), it has been operated as a proton–antiproton collider (the SppS collider), and for accelerating high energy electrons and positrons which were injected into the Large Electron–Positron Collider (LEP). Since 2008, it has been used to inject protons and heavy ions into the Large Hadron Collider (LHC). The On-Line Isotope Mass Separator (ISOLDE), which is used to study unstable nuclei. The radioactive ions are produced by the impact of protons at an energy of 1.0–1.4 GeV from the Proton Synchrotron Booster. It was first commissioned in 1967 and was rebuilt with major upgrades in 1974 and 1992. REX-ISOLDE increases the charge states of ions coming from the ISOLDE targets, and accelerates them to a maximum energy of 3 MeV/u. The Antiproton Decelerator (AD), which reduces the velocity of antiprotons to about 10% of the speed of light for research into antimatter. The Compact Linear Collider Test Facility, which studies feasibility issues for the future normal conducting linear collider project. The Large Hadron Collider Main article: Large Hadron Collider Construction of the CMS detector for LHC at CERN Most of the activities at CERN are currently directed towards building a new collider, the Large Hadron Collider (LHC) and the experiments for it. The LHC represents a large-scale, worldwide scientific cooperation project.

The LHC tunnel is located 100 metres underground, in the region between the Geneva airport and the nearby Jura mountains. It uses the 27 km circumference circular tunnel previously occupied by LEP which was closed down in November 2000. CERN's existing PS/SPS accelerator complexes will be used to pre-accelerate protons which will then be injected into the LHC. Seven experiments (CMS, ATLAS, LHCb, MoEDAL12 TOTEM, LHC-forward and ALICE) will run on the collider; each of them will study particle collisions from a different point of view, and with different technologies. Construction for these experiments required an extraordinary engineering effort. Just as an example, a special crane had to be rented from Belgium in order to lower pieces of the CMS detector into its underground 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. This accelerator will generate vast quantities of computer data, which CERN will stream to laboratories around the world for distributed processing (making use of a specialised grid infrastructure, the LHC Computing Grid). In April 2005, a trial successfully streamed 600 MB/s to seven different sites across the world. If all the data generated by the LHC is to be analysed, then scientists must achieve 1,800 MB/s before 2008. The initial particle beams were injected into the LHC August 2008.13 The first attempt to circulate a beam through the entire LHC was at 8:28 GMT on 10 September 2008,14 but the system went wrong because of a faulty magnet connection, and it was stopped for repairs on 19 September 2008. The LHC resumed its operation on Friday the 20th of November 2009 by successfully circulating two beams, each with an energy of 3.5 trillion electron volts. The challenge that the engineers then faced was to try and 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 the LHC's main engineer Steve Myers, director for accelerators and technology at the Swiss laboratory. At 1200 BST on Tuesday the 30th of March 2010 the LHC successfully smashed two proton particle beams travelling with 3.5 TeV (trillion electron volts) of energy, resulting in a 7 TeV event. However this is just the start of a long road toward the expected discovery of the Higgs boson. This is mainly because the amount of data produced is so huge it could take up to 24 months to completely analyse it all. At the end of the 7 TeV experimental period, the LHC will be shut down for maintenance for up to a year, with the main purpose of this shut down being to strengthen the huge magnets inside the accelerator. When it re-opens, it will attempt to create 14 TeV events. Decommissioned accelerators The original linear accelerator (LINAC 1). The 600 MeV Synchrocyclotron (SC) which started operation in 1957 and was shut down in 1991. The Intersecting Storage Rings (ISR), an early collider built from 1966 to 1971 and operated until 1984. The Large Electron–Positron Collider (LEP), which operated from 1989 to 2000 and was the largest machine of its kind, housed in a 27 km-long circular tunnel which now houses the Large Hadron Collider. The Low Energy Antiproton Ring (LEAR), commissioned in 1982, which assembled the first pieces of true antimatter, in 1995, consisting of nine atoms of antihydrogen. It was closed in 1996, and superseded by the Antiproton Decelerator. Sites CERN's main site, as seen from Switzerland looking towards France. Interior of office building 40 at the Meyrin site. Building 40 hosts many offices for scientists working for CMS and Atlas.

The smaller accelerators are located 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 so there is no obvious border within the site, apart from a line of marker stones. There are six entrances to the Meyrin site: A, in Switzerland. Open for all CERN personnel at specific times. B, in Switzerland. Open for all CERN personnel at all times. Often referred to as the main entrance. C, in Switzerland. Open for all CERN personnel at specific times. D, in Switzerland. Open for goods reception at specific times. E, in France. Open for French-resident CERN personnel at specific times. Controlled by customs personnel. Named "Porte Charles de Gaulle" in recognition of his role in the creation of the CERN.15 Tunnel entrance, in France. Open for equipment transfer to and from CERN sites in France by personnel with a specific permit. This is the only permitted route for such transfers. Under the CERN treaty, no taxes are payable when such transfers are made. Controlled by customs personnel. The SPS and LEP/LHC tunnels are located underground 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 themselves 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 which will be used for 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 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. Financing (Budget 2009) Member state Contribution Mil. CHF Mil. EUR  Germany 19.88 % 218.6 144.0  France 15.34 % 168.7 111.2  United Kingdom 14.70 % 161.6 106.5  Italy 11.51 % 126.5 83.4  Spain 8.52 % 93.7 61.8  Netherlands 4.79 % 52.7 34.7  Switzerland 3.01 % 33.1 21.8  Poland 2.85 % 31.4 20.7  Belgium 2.77 % 30.4 20.1  Sweden 2.76 % 30.4 20.0  Norway 2.53 % 27.8 18.3  Austria 2.24 % 24.7 16.3  Greece 1.96 % 20.5 13.5  Denmark 1.76 % 19.4 12.8  Finland 1.55 % 17.0 11.2  Czech Republic 1.15 % 12.7 8.4  Portugal 1.14 % 12.5 8.2  Hungary 0.78 % 8.6 5.6  Slovakia 0.54 % 5.9 3.9  Bulgaria 0.22 % 2.4 1.6 Total 100 % 1098.6 724.0

citation neededExchange rates: 1 CHF = 0,659 EUR (May 25, 2009) Member states Member states of CERN as of 2008   Founding members   Members who joined CERN later Animated map showing changes in CERN membership from 1954 until 1999 (borders as of 1989 and 2008) CERN members (in blue) and observers (in red: USA, Israel, Turkey, Japan, India, and Russia) as of 2008[update] CERN: where the Web was born16 The original twelve (12) CERN signatories from 1954 were:  Belgium  Denmark  France  Germany (at first only West Germany)  Greece  Italy  Netherlands  Norway  Sweden  Switzerland  United Kingdom  Yugoslavia (later withdrawn) All founding members have so far (as of 2008[update]) remained in the CERN organisation, except Yugoslavia which left in 1961 and never re-joined. Since its foundation, CERN regularly accepted new members. All new members have remained in the organisation continuously since their acceptance, except Spain which joined in 1961, withdrew eight years later, and joined anew in 1983. CERN's membership history is as follows:  Austria joined in 1959, bringing the total number of members to 13.  Yugoslavia left in 1961 (12 members)  Spain joined in 1961 (thus increasing the number of member states to 13 again), left in 1969 (12 members), rejoined in 1983 (13 members)  Portugal joined in 1985 (14 member states)  Finland joined in 1991  Poland joined in 1991 (together with Finland bringing the number of participating member states to 16)  Hungary joined in 1992 (17 members)  Czech Republic joined in 1993  Slovakia joined in 1993 (together with Czech Republic increasing the total members to 19)  Bulgaria joined in 1999 (20 member states) There are currently twenty (20) member countries, 18 of which are also European Union member states.  Romania became a candidate for accession to CERN in 2010 and will become the 21st member country in 201517  Serbia became a candidate for accession to CERN in December 2010. Accession talks are expected to last 3 years. 18 Six (6) additional countries have observer status:19  Turkey – since 1961  Israel – since 1991  Russia – since 1993  Japan – since 1995  United States – since 1997  India – since 2002 Also observers are the following international organizations: UNESCO – since 1954 European Commission – since 1985 Non-Member States (with dates of Co-operation Agreements) currently involved in CERN programmes are:  Algeria  Argentina – 11 March 1992  Armenia – 25 March 1994  Australia – 1 November 1991  Azerbaijan – 3 December 1997  Belarus – 28 June 1994  Brazil – 19 February 1990 & October 2006  Canada – 11 October 1996  Chile – 10 October 1991  People's Republic of China – 12 July 1991, 14 August 1997 & 17 February 2004  Colombia – 15 May 1993  Croatia – 18 July 1991  Cuba  Cyprus – 14 February 2006  Estonia – 23 April 1996  Georgia – 11 October 1996  Iceland – 11 September 1996  Iran – 5 July 2001  Ireland  Lithuania – 9 November 2004  Macedonia – 27 April 200920  Mexico – 20 February 1998  Montenegro – 12 October 1990  Morocco – 14 April 1997  New Zealand – 4 December 2003  Pakistan – 1 November 1994. The possibility of Pakistan becoming an Observer State has been raised on various occasions.  Peru – 23 February 1993  Romania – 1 October 1991. Since 12 December 2008 it has the Status of Candidate for Accession to Membership.  Serbia – 8 June 2001. In 2008 it applied for accession to CERN as a Member State.21. Since 19 December 2010 it has the Status of Candidate for Accession to Membership.22  Slovenia – 7 January 1991  South Africa – 4 July 1992  South Korea – 25 October 2006. It might become a candidate for CERN Observer Status in a few years.  Republic of China (Taiwan)  Thailand  Ukraine – 2 April 1993  Vietnam Maps of the history of CERN membership

1954 (12 members): CERN is founded a[›] (1989 borders) 1959 (13 members): Austria joins (1989 borders) 1961 (13 members): Spain joins and Yugoslavia leaves (1989 borders) 1969 (12 members): Spain leaves (1989 borders) 1983 (13 members): Spain re-joins (1989 borders) 1985 (14 members): Portugal joins (1989 borders) 1991 (16 members): Poland and Finland join, and Germany has been reunified (2008 borders) 1992 (17 members): Hungary joins (2008 borders) 1993 (19 members): Czech Republic and Slovakia join (2008 borders) 1999 (20 members): Bulgaria joins (2008 borders) Animated map showing changes in CERN membership from 1954 until 1999 (borders are as of 1989 and 2008) World map showing CERN members in blue and observers in red, as of 2008 Public exhibits The Globe of Science and Innovation at CERN Facilities at CERN open to the public include: The Globe of Science and Innovation, which opened in late 2005 and is used four times a week for special exhibits. The Microcosm museum on particle physics and CERN history. In popular culture CERN is mentioned in several works of fiction and science fiction such as Robert J. Sawyer's Flashforward and Dan Brown's Angels & Demons in which antimatter figures prominently. CERN's Large Hadron Collider is the subject of a (scientifically accurate) rap video starring Katherine McAlpine with some of the facility's staff.2324 CERN is also referenced in several episodes of The Big Bang Theory and there is a Season 3 episode in which the Large Hadron Collider features prominently called The Large Hadron Collision. See also Book:Large Hadron Collider Books are collections of articles that can be downloaded or ordered in print. Fermilab Large Hadron Collider List of Directors General of CERN Science and technology in Switzerland SLAC National Accelerator Laboratory Stanford Linear Accelerator Center World Wide Web References ^ a b "CERN.ch". Public.web.cern.ch. http://public.web.cern.ch/public/en/About/History54-en.html. Retrieved 2010-11-20.  ^ The CERN Name, on the CERN website. ^ "CERN.ch". Public.web.cern.ch. http://public.web.cern.ch/public/en/About/History73-en.html. Retrieved 2010-11-20.  ^ "CERN.ch La". Public.web.cern.ch. http://public.web.cern.ch/public/en/About/History83-en.html. Retrieved 2010-11-20.  ^ "CERN.ch". Public.web.cern.ch. http://public.web.cern.ch/public/en/About/History95-en.html. Retrieved 2010-11-20.  ^ "V. Fanti et al., Phys. Lett. B465 (1999) 335 (hep-ex/9909022)0". Arxiv.org. 1999-09-13. http://arxiv.org/abs/hep-ex/9909022v1. Retrieved 2010-11-20.  ^ "Antihydrogen isolation". CNN. http://edition.cnn.com/2010/WORLD/europe/11/18/switzerland.cern.antimatter/?hpt=Mid.  ^ "CERN.ch". Public.web.cern.ch. http://public.web.cern.ch/Public/en/About/WebStory-en.html. Retrieved 2010-11-20.  ^ "W3.org". W3.org. http://www.w3.org/History/19921103-hypertext/hypertext/WWW/TheProject.html. Retrieved 2010-11-20.  ^ "CERN.ch". CERN.ch. http://www.cern.ch/ben/TCPHIST.html. Retrieved 2010-11-20.  ^ "CERN Website – LINAC". Linac2.home.cern.ch. http://linac2.home.cern.ch/linac2/default.htm. Retrieved 2010-11-20.  ^ CERN Courier, "MoEDAL becomes the LHC's magnificent seventh", May 5th 2010 ^ Overbye, Dennis (29 July 2008). "Let the Proton Smashing Begin. (The Rap Is Already Written.)". The New York Times. ^ "CERN press release, 7 August 2008". Press.web.cern.ch. 2008-08-07. http://press.web.cern.ch/press/PressReleases/Releases2008/PR06.08E.html. Retrieved 2010-11-20.  ^ "Red Carpet for CERN's 50th". CERN bulletin. November 2004. http://bulletin.cern.ch/eng/articles.php?bullno=45/2004&base=art.  ^ Plaque #2196 on Open Plaques. ^ "CERN.ch". Public.web.cern.ch. doi:10.1038/nature09610. http://public.web.cern.ch/public/. Retrieved 2010-11-20.  ^ [1] ^ "ISAAR relationship data at CERN library". http://library.web.cern.ch/library/Archives/archnet/isaarcern.html. Retrieved 2009-12-14.  ^ "''Macedonia joins CERN (SUP)''". Mia.com.mk. http://www.mia.com.mk/default.aspx?mId=1&vId=64153836&lId=2&title=MACEDONIA+-+INTERNAL+AFFAIRS+. Retrieved 2010-11-20.  ^ "Djelic to meet CERN Director General". Emportal.rs. http://www.emportal.rs/en/news/serbia/87520.html. Retrieved 2010-11-20.  ^ [2] ^ "Youtube.com". Youtube.com. http://www.youtube.com/watch?v=j50ZssEojtM. Retrieved 2010-11-20.  ^ "Large Hadron Collider Rap Video Is a Hit", National Geographic News. September 10, 2008. Retrieved August 13, 2010. External links Wikimedia Commons has media related to: CERN Official website CERN at 50 CERN Courier – International journal of high-energy physics CERN chronology v · d · eEuropean Organization for Nuclear Research (CERN) Experiments SPS List of SPS experiments · UA1 · UA2 · NA48 · NA49 · NA58/COMPASS · NA61/SHINE · NA62 · CNGS LEP List of LEP experiments · Aleph · Delphi · L3 · Opal · LEP5 · LEP6 · COSMOLEP LHC List of LHC experiments · ALICE · ATLAS · CMS · FP420 · HV-QF · LHCb (VELO) · LHCf · LHC@home · MoEDAL · TOTEM Acceleration structure LINAC 2 (p) · LINAC 3 (Pb) · Proton Synchrotron · Proton Synchrotron Booster · Super Proton Synchrotron Others ISOLDE · ISR · CAST · CTF3 · MISTRAL · OSQAR

Coordinates: 46°14′03″N 6°03′10″E / 46.23417°N 6.05278°E / 46.23417; 6.05278

Coordinates: 46°14′03″N 6°03′10″E / 46.23417°N 6.05278°E / 46.23417; 6.05278

Coordinates: 46°14′03″N 6°03′10″E / 46.23417°N 6.05278°E / 46.23417; 6.05278