Extraction System for the Chalk River Superconducting Heavy-Ion Cyclotron

The extraction system proposed for the Chalk River heavy-ion superconducting cyclotron is described. The main components are a conventional electrostatic deflector, a pair of passive magnetic lenses and a superconducting magnetic channel. Trim rods are used to generate suitable first harmonic fields to exploit the vr = 1 resonance. The lenses are made from saturated iron and are located at the leading and trailing edge of the hill immediately following the dee containing the deflector. The channel has two sections. The first uses saturated iron to give a fixed radial gradient of ~30 T/m and superconducting windings to generate a variable bias magnetic field (0.4 T maximum). The second uses superconductors to generate a variable focusing gradient and an independently variable bias f ield.