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Joined 2026-09-21 Message
Incoming links: Ernest Orlando Lawrence
Lawrence-Livingston cyclotron experiment 2026-10-18
Ernest Orlando Lawrence and Milton Stanley Livingston reported repeated ion acceleration in 1932. Their evacuated brass chamber used one driven hollow cyclotron dee; the grounded box and slotted divider supplied the other electrode. Filament Electrons ionized hydrogen near the gap. A perpendicular magnetic field bent the ions; a high-frequency oscillator drove the gap. Deflecting plates and slits selected particles for a Faraday cup, read by an electrometer.[ref]
The Production of High Speed Light Ions Without the Use of High Voltages by Ernest Orlando Lawrence and Milton Stanley Livingston. Lawrence and Livingston, 1932, pp. 25–28, Figs. 2–4: actual accelerating electrode, source, collector and oscillator
Scanning the magnetic field produced narrow resonance peaks. The optimum deflecting voltage tracked the kinetic energy predicted from field and orbit radius, supporting the reported protons. Source width and slit geometry limited this check; it was not a direct energy measurement of every particle.[ref]
The Production of High Speed Light Ions Without the Use of High Voltages by Ernest Orlando Lawrence and Milton Stanley Livingston. pp. 31–33, Figs. 7–9: resonance scans, field and wavelength measurements, deflection-voltage energy check and geometric uncertainty; p. 19: maximum reported proton energy
This combination distinguishes producing a circulating electric current from establishing its kinetic energy. The electrometer measures collected electric charge per unit time; it cannot by itself tell whether the collected particles are fast. The separate deflection selection supplies a speed-dependent test. Agreement of two consequences of the model, the cyclotron resonance condition and the cyclotron energy and orbit radius relation, makes the inference stronger than either a current signal or a predicted orbit alone.
Milton Stanley Livingston built the early cyclotrons with Ernest Orlando Lawrence; the 1939 Nobel Prize in Physics went to Ernest Orlando Lawrence. His lecture, The evolution of the cyclotron, was delivered on 11 December 1951.[ref]
More Timelines by Lawrence Livermore National Laboratory. Ernest Lawrence entry: 1939 prize and delayed lecture on 11 December 1951
[ref]M. Stanley Livingston by Fermilab. M. Stanley Livingston: co-inventor of the cyclotron and early Berkeley work
Nobel Prize in Physics in 1939 2026-10-18
Awarded to Ernest Orlando Lawrence for the cyclotron and results obtained with it, connecting repeated acceleration to nuclear experiments.[ref]
The Nobel Prize in Physics 1939 by Nobel Prize Outreach. Official award record: laureate, year and stated scientific subject