Proton beams are back in the LHC!
The CERN operations experts still have several weeks of work left to do before they can actually collide beams at the energy of 13 TeV, twice the energy that led to the observation of the Higgs boson 2 years ago.
During the 2-year technical stop of the LHC, 10,000 electrical interconnections between the magnets were consolidated, magnet protection systems were added, the cryogenic and vacuum systems were improved and strengthened, and the way that the beams are set up was modified so that the time separating every bunch of protons is reduced from 50 to 25 nanoseconds.
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Updates are posted every day or two on their blog:
http://home.web.cern.ch/
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