Geneva (ISJ) - CERN1?s Large Hadron Collider (LHC) started delivering physics data for the first time after it was shut down more than two years ago. The LHC is now providing collisions to all of its experiments at the unprecedented energy of 13 TeV, almost double the collision energy of its first run. (TeV means tera electron Volts, i.e., 1,000,000,000,000 electron Volts or 10 12 electron Volts). This marks the start of season 2 at the LHC, opening the way to new discoveries. The LHC will now run round the clock for the next three years.
?With the LHC back in the collision-production mode, we celebrate the end of two months of beam commissioning,? said CERN Director of Accelerators and Technology Fr�d�rick Bordry. ?It is a great accomplishment and a rewarding moment for all of the teams involved in the work performed during the long shutdown of the LHC, in the powering tests and in the beam commissioning process.?
On Wednesday (June 03), the LHC operators declared ?stable beams?, the signal for the LHC experiments that they can start taking data. Beams are made of ?trains? of proton bunches moving at almost the speed of light around the 27 kilometre ring of the LHC.
These so-called bunch trains circulate in opposite directions, guided by powerful superconducting magnets. Yesterday, the LHC was filled with 6 bunches each containing around 100 billion protons. This rate will be progressively increased as the run goes on to 2808 bunches per beam, allowing the LHC to produce up to 1 billion collisions per second.
During the first run of the LHC, the ATLAS and CMS experiments announced the discovery of the so-called Higgs boson, which was the last piece of the puzzle known as the Standard Model, a theory that describes the fundamental particles from which everything visible in the universe is made, along with interactions at work between them.
?The first 3-year run of the LHC, which culminated with a major discovery in July 2012, was only the start of our journey. It is time for new physics!? said CERN Director General Rolf Heuer.?
With run 2 starting on Wednesday, physicists have the ambition to further explore the Standard Model and even to find evidence of new physics phenomena beyond its boundaries, which could explain remaining mysteries such as dark matter, believed to make up about a quarter of the universe, or nature?s apparent preference for matter over antimatter, without which we would not exist.
Over the two-year shutdown, the four large experiments ALICE, ATLAS, CMS and LHCb also went through an important programme of maintenance and improvements in preparation for the new energy frontier.
?The collisions we are seeing today indicate that the work we have done in the past two years to prepare and improve our detector has been successful and marks the beginning of a new era of exploration of the secrets of nature,? said CMS spokesperson Tiziano Camporesi.
Image courtesy: CERN