 Examples of such facilities are LHC, LEP, PEP-II, KEKB, RHIC, Tevatron and HERA.A storage ring is a type of synchrotron.While a conventional synchrotron serves to accelerate particles from a low to a high energy state with the aid of radio-frequency accelerating cavities, a storage ring keeps particles stored at a constant energy and radio-frequency cavities are only used to replace energy lost through synchrotron radiation and other processes.