The physicists of the European Organization for Nuclear Research, near Geneva, probe the fundamental building blocks of matter.
If you can read this article and check your Facebook notifications it is to some extent thanks to the European Organization for Nuclear Research (CERN). Tim Berners-Lee, a British physicist, invented the World Wide Web, i.e. the internet, in 1989 while working at CERN. The original aim was to facilitate the exchange of information between researchers working together on the primary mission of this prestigious laboratory of fundamental physics: to discover the laws of the universe.
Tim Berners-Lee, British former CERN physicist, who invented the World Wide Web in 1989 © CERN
CERN is located at Meyrin, in the canton of Geneva on the border of France and Switzerland. It employs almost 3,200 people from 21 member states, all European with the exception of Israel. Its activities however reach far beyond the European context. In total, some 12,000 scientists representing 600 institutes and universities, 70 countries and 120 nationalities contribute the results of their research. That is half of the world’s particle physicists!
Switzerland was chosen to host CERN to a large extent because of its neutrality and its safeguards against the misappropriation of scientific research results for military purposes. This was especially important when the organisation was established in 1954 because the world was just entering the Cold War. Switzerland offers other advantages including its location in the heart of Europe, its tradition as host country to international organisations and its stability.
Work starts on the construction of CERN at Meyrin, near Geneva, Switzerland, in 1954 CERN These are indispensable factors for carrying out scientific research and developing infrastructures of long duration because unmasking the laws of nature requires at the least a minimum of patience. “It involves understanding what matter is made of, that is to identify its fundamental or elementary constituent particles and to study how they interact with each other,” explains Peter Jenni, 68, renowned CERN particle physicist, who until 2009 headed the ATLAS experiment, the largest detector of the Large Hadron Collider (LHC), which is the main working tool of the organisation’s researchers.
The world’s most powerful accelerator
A collider, or accelerator, is a linear or circular tube in which scientists collide particles at very high speeds. The result of the collisions is then analyzed by the detectors. The LHC, which entered into service on 10 September 2008, is the most powerful collider ever built. Its underground circular tunnel is 27 km long and the particles, which are guided by superconducting magnets, are propelled at speeds approaching the speed of light. Its successor, which is currently under study, might even run under Lake Geneva.
Aerial visualisation of the circular tunnel LHC and its four detectors (ATLAS, CMS, Alice, LHCb). Geneva is situated at the end of the lake © CERN
Experiments conducted in 2012 using the LHC confirmed the existence of the Higgs boson, which had already been suggested in 1964. The ‘God particle’, as it is sometimes called, is associated with the Brout-Englert- Higgs field which, put simply, fills the empty space around us and in space, and gives mass to elementary particles.
The Higgs boson is the missing piece of thesta ndard model of particle physics, which was developed in the 1970s and explains how particles of matter work and how three of the four fundamental forces – including electromagnetism, but not gravity – govern the universe. It was therefore a major discovery.
Recreating the dark matter particle
One of the LHC’s functions is to enable exploration of the theories that don’t fit the standard model, such as ‘supersymmetry’. “Supersymmetry is very popular because it postulates the existence of a particle that would have been created just after the Big Bang and which could be responsible for dark matter.” Dark matter is this invisible matter that holds the galaxies together through a gravitational force effect. “With the energy of the LHC we might be able to reproduce the conditions in which this particle was created. This is one of our main priorities.” CERN not only explores our universe through physics, but also through culture. In 2011, CERN launched the Arts@CERN initiative that aims to promote dialogue between the arts, science and technology. Residency programmes are offered to develop projects at the interface of these disciplines. The laboratory has already opened its doors to dozens of artists. Who says that science and spirituality are incompatible?