Invited Paper-Extraction Studies in an AVF Cyclotron

For the extraction of the beam in an AVF cyclotron a regenerative system or an electrostatic channel can be used. Some factors of importance for the beam will be discussed. Extraction with an electrostatic channel can give very high external beam quality and extraction efficiency. For such a system it is of importance whether the beam is extracted before or after the νR=₁ resonance. The beam can even pass the νR=2νZ resonance without blowing up vertically if attention is being paid to the radial oscillation amplitude and some machine parameters. The general orbit theory can be used for an analytical study of a regenerative system in an A.V.F. cyclotron.