Ernest Lawrence & cyclotron

Ernest Lawrence & cyclotron

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Caption: Ernest Lawrence (kneeling, white shirt) & members of his team try to coax a beam in their '27-inch' (69 cm) cyclotron in December 1932. The third of Lawrence's cyclotrons, it accelerated protons to 4.8 MeV. Edwin McMillan, who helped Lawrence develop the cyclotron, is third from left. The protons originated from a radioactive source at the centre of the cyclotron & then circled round within a hollow chamber, divided into 2 D-shaped hemispheres; as they crossed the gaps between the Ds, they were accelerated by an electric field. The protons were contained by a magnetic field, but spiralled outwards as they gained energy.

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Keywords: accelerator, cyclotron, ed, ernest, lawrence, lawrence berkeley, lbl, mcmillan, particle physics laboratory, proton acclelerator, research, third

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