ADA (short for Anello Di Accumulazione, also stylized as AdA) was one of the first Italian particle accelerators and the first-ever electron–positron particle collider, measuring approximately 1.3 metres (4 ft 3 in) in diameter and designed to store beams of 250 MeV.
[2] After the machine's construction, it was operated from 1961 to 1964 by the National Institute of Nuclear Physics, in Frascati, Italy.
[1] In 1962, the machine was relocated to the Laboratoire de l’Accelerateur Lineaire in Orsay, France, where it was used for an additional four years alongside the laboratory's powerful particle injector.
[citation needed] Towards the end of 1963, AdA's first electron-positron collisions were recorded and the machine was operated successfully a few more years before dismantling.
[citation needed] The ADA collider is no longer operational but the legacy of the machine lives on today.