The Higgs boson can rest easy. Physicists are not close to flush out the mysterious particle of matter. Designed for this purpose, the European Accelerator LHC prepares to restart a year after a failure in the first rounds of heater. But, in August, the CERN () announced that its particle accelerator, the most powerful in the world, will leave smooth. Overheating risk imposed upon indeed a year and a half running, from its maximum power of 14 TeV (téraélectronvolts). He will start at 7 TeV, then will be in 2011 to 10 TeV. A hard blow more for scientific programs.
The electrical connection between two magnets 1,600 of the machine had floundered, in September 2008, producing a few sparks grillèrent helium cooling system. It was followed by a brutal gas leak that damaged 53 magnets. At very low temperature, the superconducting magnets produce an electromagnetic field very powerful to accelerate two coaxial Proton beams. The set of the LHC is to bring bundles of protons to energies of several VTE, then to hitting the two beams in various measuring instruments. They then analyze the sheaves of sous-particules produced in the hope of finding intruders. It is in these sheaves that researchers hope to find one day the famous boson remains the missing link in the bestiary of particle physics. Pure theoretical creation, physicists rely on its existence to plug the holes of the standard model that governs matter. This is why accelerators the trace for several decades to the blind, the theory does not specifying at what level of energy found. So far, the existing machines have tried their luck in the Windows of low energies at which they could access. The American laboratory Fermilab Tevatron Accelerator is most likely the stuck. A perspective that reinforces the pressure on European researchers.
Hundreds of theses
For a year, technicians at CERN have replaced the damaged items. All of the connectors has been changed and the machine enjoys a closer monitoring system. Scientists do not turned thumbs in the meantime. Some of the four monumental instruments which intercept the acceleration tunnel have been improved. Why physicists have used cosmic radiation capable of instruments under the ground. What makes say to Rolf Heuer, Director General of CERN, that it "includes much better now than a year ago LHC".
Some researchers are dismayed by these delays. Experience as the LHC drains hundreds of theses and doctorates in the world. Others, like Yves Sirois, head of the CMS to the CNRS instrument, welcome the decision of the CERN, described as reasonable: "We will still be able to interesting physics this year." This energy of 7 TeV to access of new example gauge bosons. It will also test as expected all the computer data processing system and the global grid.
The physicist hopes now that startup happens correctly to produce sufficient data next year. He and his European colleagues have their eyes pointing towards a first tag: 35th Congress history of particle physics, to be held in Paris in July 2010, a track where are usually presented the results of the discipline.
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