From the Guardian:
Last week, Cern announced that the LHC will finally begin firing protons around its 27km circular tunnel again in November. Initially, it will run at an energy of 3.5 tera-electronvolts (TeV) per beam – just half of what it’s meant to achieve at full blast, but still several times more than the LHC’s American competitor, the Tevatron at Fermilab, can manage. After operating at this lower level for a period, the energy will be increased to 5TeV per beam.
According to Cern spokesman James Gillies, the mood at Cern is optimistic.
“We’re looking forward to getting going,” he said. “There’s consensus that the choices that have been taken to run the machine safely at 3.5TeV per beam are good choices. They allow the machine operators to learn how to drive the machine, if you like, under what should be very easy conditions for them, and they don’t compromise the physics.”
Gillies is confident that there won’t be another serious mishap this time around.