article_snippet.sent: The Large Hadron Collider was restarted today after being turned off for two years during a major renovation project that cost £100million.
article_snippet.sent: Back to work: The Large Hadron Collider is operating again after two years being upgraded .
article_snippet.sent: the LHC was shut down two years ago - after confirming the discovery of the Higgs boson - so that the LHC energy levels could be almost doubled, allowing scientists to carry out more extreme experiments.
article_snippet.sent: The re-opening was delayed by another couple of weeks thanks to a short circuit in the system, but this morning the LHC started operating again at last.
article_snippet.sent: The LHC, which cost nearly £4billion, is currently running at a low 'injection' energy of 450 giga-electron volts (GeV), but in June a low 'injection' energy of 450 giga-electron volts (GeV) will increase to a record-breaking 13 tera-electron volts (TeV) - up from 7 TeV at the time the machine managed to detect the Higgs boson in 2013.
article_snippet.sent: Cern spokesman Arnaud Marsollier said: 'The LHC will be running day and night.
article_snippet.sent: The LHC's operating again for the first time in two years and that's a really important milestone in physics. '
article_snippet.sent: Professor Andy Parker, head of physics at Cambridge University, said: 'This is a very exciting time for scientists as the Large Hadron Collider restarts after a major upgrade. '
highlights_snippet.sent: The Large Hadron Collider has spent the past two years being upgraded .
  
highlights_snippet.sent: The Large Hadron Collider started operation again today and will soon have nearly twice as much energy as The Large Hadron Collider used to .
  