The Bevatron

On this site in 1955, a year after completion of the Bevatron, Chamberlain, Segrè, Wiegand, and Ypsilantis reported the discovery of the anti-proton. In the 1960s bubble chambers here revealed many new particles, evidence for SU(3) symmetry, now known to be the sign of the three lightest quarks. Later, Ghiorso conceived and Grunder built the Bevalac by merging the Bevatron and the SuperHILAC into the world’s first relativistic heavy-ion accelerator. It accelerated ions from protons to uranium, launching high-energy heavy-ion physics and clinical radiotherapy with heavy-ion beams.