Abstract
THE cyclotron constructed in the workshop of the Physics Department of Purdue University, Indiana, is described in the November issue of the Journal of the Franklin Institute by the five members of the staff who designed it. So far as possible standard materials available in industry have been used in its construction. The magnet is of low carbon steel 3 m. long and 2 m. high, and the pole pieces of special shape 1 m. diameter. The magnetizing coils are of thin copper tube through which cold water circulates. Each coil is square in section with side 30 cm. The oscillator is of the tuned grid tuned plate type, of frequency 10·9 Mc., with neutralizing condensers. It takes 3 amperes at 8,500 volts. The chamber is of the Berkeley type with floor and top of steel plate 3 cm. thick with special arrangements for controlling the bending due to external pressure, which has been found to increase the beam intensity. The ions are supplied by an arc near the centre of the cyclotron. The instrument yields 16·5 million volts for He++ ions.
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A New Cyclotron. Nature 144, 1087 (1939). https://doi.org/10.1038/1441087a0
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DOI: https://doi.org/10.1038/1441087a0