First cyclotron, built in 1930

First cyclotron, built in 1930

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Caption: The first successful cyclotron, built by Ernest Lawrence at Berkeley, California, in 1930. Only 13 cm in diameter, it accelerated protons to 80 keV. The protons originated from a radioactive source at the centre of the cyclotron & then circled round within the hollow chamber, divided into 2 D- shaped hemispheres; as they crossed the gaps between the two Ds, they were accelerated by an electric field. The protons were held within the chamber by a magnetic field, but spiralled outwards as they gained acceleration until they finally emerged with an energy of 80 keV.

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Keywords: accelerator, california, cyclotron, ernest, ernest's cyclotron, first, lawrence, lawrence berkeley, lbl, odyssey, particle physics laboratory, proton accelerator, research, us, usa

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