In 1946, he became a full professor at Berkeley, and in 1954 he was appointed associate director of the Lawrence Radiation Laboratory, being promoted to director in 1958, where he stayed until his retirement in 1973.
McMillan also understood clearly the focusing effect of the radial fall-off of the magnetic field and the magnitude of the deviation from the synchronicity condition in the cyclotron produced by that radial fall-off, added to the relativistic mass increase.
McMillan recognized that when particles are accelerated in a radiofrequency field not at the crest of the radiofrequency amplitude but on the side of the waveform, the particles would be locked stably at a certain phase.
McMillan himself participated in the mapping of the neutron beam produced by high-energy deuterons on internal targets and was an advisory participant in innumerable experiments.
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