Geneva 14 February 2013. At 7.24am, the shift crew in the CERN1 Control Centre extracted the beams from the Large Hadron Collider, bringing the machine’s first three-year running period to a successful conclusion. The LHC now begins its first long shutdown, LS1. Over the coming months major consolidation and maintenance work will be carried out across the whole of CERN’s accelerator chain. The LHC will be readied for higher energy running, and the experiments will undergo essential maintenance. LHC running is scheduled to resume in 2015, with the rest of the CERN complex starting up again in the second half of 2014.
CERN Updates February 2013.
2013: the world’s highest-energy particle accelerator is just getting started. What's next for the Large Hadron Collider? Experiments at the Large Hadron Collider made a major discovery, but the world’s highest-energy particle accelerator is just getting started.Experiments at the Large Hadron Collider made a major discovery, but the world’s highest-energy particle accelerator is just getting started. Starting in March 2013, the LHC’s long shutdown will give scientists, engineers and technicians the opportunity to upgrade the machine to run close to its design energy. Scientists expect to collect data from more than 200 quadrillion particle collisions after the machine switches back on in 2015. At higher energies, they will be able to see even more interesting events.
Symmetry. February, 2013.
Protons smash lead ions in first collisions of 2013. On January 21st, after a week of tests with beams of protons and lead ions, the LHC team declared "stable beams" as protons collided with lead ions in the first LHC physics beams of 2013. The collisions mark the start of a lead-proton run that is set to continue until February, when the LHC begins its two-year shutdown.
CERN, January 2013.
The discoveries continue. Twenty-thirteen will be a year of new projects and new data in Particle Physics. The Dark Energy Survey will very soon begin mapping our universe as it seeks to unravel the mystery of dark energy. The NOvA experiment will power up and begin its studies of the strange properties of neutrinos. The Large Underground Xenon experiment will start its search for the quiet signal of dark matter. The Large Hadron Collider will undergo upgrades, enabling it to climb to higher collision energy and produce heavier particles, while analysis continues on the existing LHC dataset. Upgrades are also in the works for the Belle-II SuperB factory. And we expect additional results from a slew of other projects and analyses, answering questions about dark matter and dark energy, neutrino properties, the asymmetry between matter and antimatter, physics beyond the Standard Model, the cosmic phenomena that emit the most energetic form of light, and much, much more.
SYMMETRY. January 2013.
The space between proton bunches in the beams was halved. A beam in the LHC is not a continuous string of particles, but is divided into hundreds of bunches, each a few tens of centimetres long. Each bunch contains more than a hundred billion protons. During the last few days, the space between bunches has been successfully halved, achieving the design specification of 25 nanoseconds rather than the 50 nanoseconds used so far. Halving the bunch spacing allows the number of bunches in the beam to be doubled. A record number of 2748 bunches was recorded in each beam in 2012 December, almost twice as many as the maximum reached previously in 2012, but at the injection energy of 450 GeV and without collisions. Several hours of physics were then performed with up to 396 bunches in each beam, spaced by 25 nanoseconds, each beam being accelerated to the energy of 4 TeV.
CERN PRESS RELEASE December 2012
LHCb presents evidence of rare B decay. The Large Hadron Collider beauty (LHCb) collaboration presented evidence for one of the rarest particle decays ever observed at the Hadron Collider Physics Symposium in Kyoto, Japan (November 2012). The Standard Model of particle physics predicts that the B0S particle, which is made of a bottom antiquark bound to a strange quark, should decay into a pair of muons (μμ) about 3 times in every billion (109) decays. LHCb's measurement, from an analysis of data from 2011 and part of that from 2012, gives a value of (3.2+1.5-1.2) × 10-9. So, this result is in very good agreement with the prediction.
CERN BULLETIN, November 2012