The European laboratory CERN announced in May the inauguration of the new LHC accelerator. But they still don't have everything prepared. Small problems in the liquid and electric helium pumping system. For the month of May the main accelerator of the LHC will not be in operation, but two smaller accelerators associated, Proton Synchrotron and Super Proton Synchrotron. The main accelerator will begin operation in July.