The Large Hadron Collider — the giant particle accelerator in Switzerland that confirmed the Higgs boson — is back online after two years and ready to ramp up to twice its previous proton-smashing energy.

CERN, the European Organization for Nuclear Research, live blogged the restart here. The LHC was shut down to consolidate some 10,000 electrical interconnections between magnets, add protection systems, improve cryogenics, vacuums and electronics and boost the (proton) beam energy from 6.5 TeV (tera electron Volts) per beam to 13 TeV.

"After two years of effort, the LHC is in great shape," CERN Director for Accelerators and Technology, Frédérick Bordry, says. "But the most important step is still to come when we increase the energy of the beams to new record levels."

The increase to 13 TeV could start in early June, the lab says.

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