LHC Commissioning with beam

Latest News

Older news


Longer term plan


Fault tracking

Luminosity plots

Post mortem








The first 6 weeks of 2013 were devoted to a proton-lead run. Four weeks of magnet tests led into long shutdown 1 (LS1). During LS1 there will be consolidation and upgrades of all major systems. One principal activity is the opening of all magnet interconnects, the measurement of the resistance of all splices in the cables that carry the current between the main dipole and quadrupole magnets, and the repair of any non-conformities.. There are around 10,000 splices in all.

Recommissioning with beam is foreseen for the start of 2015.


Re-commissioning with beam in 2012 started on 14th March. It took around 3 weeks to restablish collisions for the experiments. This was followed by a phased intensity increase to 1380 bunches per beam - progress outlined below.

5 fb-1 were delivered to Atlas and CMS by the weekend 9-10 June.

We closed the books at the end of the first running period on Monday 18 June with: 6.6 fb-1 delivered to ATLAS; 6.8 fb-1 delivered to CMS; 0.65 fb-1 delivered to LHCb; and a little over 1 pb-1 delivered to ALICE. Given this data ATLAS and CMS were able to annouce the discovery of the Higgs boson on 4th July 2012.

The 2012 proton run continued until December 2012. A total of 23 fb-1 were delivered to both ATLAS and CMS.


Progress through the years:    2012     2011     2010     2009     Injection tests


cms int 10 to 12

External Links




Hardware Commissioning

LHC portal

Injection & beam dump study group

Machine Protection Panel


Comments: Mike Lamont