The Large Hadron Collider LHC

The Large Hadron Collider (LHC) is a circular particle accelerator. It is installed in the 27 km long tunnel which previously housed the LEP collider. In LHC protons are accelerated in both directions and collide inside the detectors.
Protons rotate in opposite directions inside the accelerator and
          collide in the middle of the experiments.
Currently, the protons in the LHC are accelerated to an energy of 3.5 TeV (until the end of 2012). This energy level is scheduled to be ramped up to 7 TeV per beam in 2014, for a total power output of 14 TeV. The accelerator inside the screen in front of you gives electrons an energy of a few keV so it corresponds to an energy of more than 1000000000 computer screen accelerators placed one after the other. An accelerator tour tour will teach you more about the LHC.