Lawrence's 60-inch cyclotron, with magnet poles 60 inches (5 feet, 1.5 meters) in diameter, at the University of California Lawrence Radiation Laboratory
, Berkeley, in August, 1939, the most powerful accelerator in the world at the time. Glenn T. Seaborg
and Edwin M. McMillan (right)
used it to discover plutonium
, and many other transuranic elements and isotopes, for which they received the 1951 Nobel Prize
in chemistry. The cyclotron's huge magnet is at left, with the flat accelerating chamber between its poles in the center. The beamline
which analyzed the particles is at right.