Patent ID: 8324841

Claim:
A cyclotron for generating a particle beam, said cyclotron comprising: a first internal ion source which produces particle ions; a Dee electrode assembly and a counter-Dee electrode assembly separated from each other by gaps for accelerating said particle ions; a generator configured to apply an alternating high voltage to said Dee electrode assembly, for producing an electric field in said gaps; a device configured to produce a magnetic field passing vertically through the Dee and counter-Dee electrode assemblies for causing the particle ions to spiral and encounter the accelerating voltage of said Dee electrode assembly, and a second internal ion source which produces the same type of particle ions as said first internal ion source, whereby said cyclotron is configured to generate an energetic particle beam produced by either said first internal ion source or by said second internal ion source, or energetic particle beams produced by both ion sources simultaneously, the cyclotron having a central axis through its center which central axis is parallel with the magnetic field, the first and second internal ion sources having bodies which include a notch at the periphery of the body oriented away from the central axis of the cyclotron, the notch being arranged to avoid collision of the particle beam produced by one internal ion source with the body of the other internal ion source.