Importance

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Abstract

The external ion injection apparatus for a cyclotron is improved so as to be applicable to a small-sized cyclotron and yet capable of accelerating a large-intensity ion beam. The improvements reside in the provision of an ion source disposed externally of a cyclotron, a first D.C. high voltage generator coupled to the ion source for generating a first D.C. high voltage to inject ions produced by the ion source as an incident ion beam with a predetermined acceleration into the cyclotron along a magnetic midplane thereof, a second D.C. high voltage generator for generating a second D.C. high voltage of the same polarity as the first D.C. high voltage, and a beam guiding electrode group arranged within the cyclotron and applied with the second D.C. high voltage for leading the incident ion beam towards the central portion of the magnetic poles of the cyclotron along a repeated semicircle orbit.

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First Claim