Injection of ions into a cyclotron from an external source

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Abstract

A technique is described which permits ions (deuterons) to be injected into a cyclotron from a outside the magnet yoke. Use is made of a hole bored through the magnet along the axis of one of the poles. A focusing system consisting of a series of einzel lens units is inserted in the hole to reduce divergence of the beam due to space charge. On arrival at the median plane, the beam is deflected electrostatically through 90° into a system of grid wires situated in the dees, and accelerated to 12 MeV in the conventional manner. The energy of the deuteron beam during injection is 11 keV, and 600 μA entering the system, 21 μA are obtained at full energy giving a net efficiency of 3.5%. The phase width of the circulating beam at full energy is found to be 70°.

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This work formed part of a thesis submitted by one of the authors (B.L.R.) to the University of Birmingham for the degree of Doctor of Philosphy.

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