LHC Circulates Two Beams Simultaneously
After a successful restart last week, CERN's Large Hadron Collider, a particle accelerator which cost $10 billion to construct, circulated two beams simultaneously for the first time.The Large Hadron Collider (LHC), the world's largest machine, successfully circulated two beams simultaneously for the first time, following the reactivation of the device on November 20. The European Organization for Nuclear Research (CERN), a Geneva-based particle physics laboratory which built the LHC, spent more than a year repairing the $10 billion device, built with the intention of testing various predictions of high-energy physics, when, due to a fault between two superconducting bending magnets, the project was brought to halt soon after the first tests began in September 2008.
"It's a great achievement to have come this far in so short a time," said CERNdirector general Rolf Heuer, noting these developments come just three days after the LHC restart. "But we need to keep a sense of perspective - there's still much to do before we can start the LHC physics program."
Since the start-up, the operators have been circulating beams around the ring alternately in one direction and then the other at the injection energy of 450 GeV. The beam lifetime has gradually been increased to 10 hours, and on Tuesday beams have been circulating simultaneously in both directions, still at the injection energy. CERN said next on the schedule is an intense commissioning phase aimed at increasing the beam intensity and accelerating the beams. All being well, by Christmas, the LHC should reach 1.2 TeV per beam, and have provided good quantities of collision data for the experiments' calibrations, the organization noted.
"This is great news, the start of a fantastic era of physics and hopefully discoveries after 20 years' work by the international community to build a machine and detectors of unprecedented complexity and performance," said ATLAS spokesperson Fabiola Gianotti.