INJECTION AND CENTRAL REGION DESIGN FOR THE IBA C70 CYCLOTRON

The C70 cyclotron accelerates ions with q/m = 1 (H−) as well as q/m = 1/2 (D−, He2+, H+2). The beam is in-jected axially and bent onto the median plane with a spiral inflector. An electrostatic deflector placed at the exit of the spiral inflector, is used for centering both types of particles. An ECR ion source produces the He2+ and H+2 particles; a multicusp ion source produces the other two particles. A 90 ◦ dipole combination magnet bends both beams into the common vertical part of the injection line. The injection line further contains a quadrupole triplet that restores rota-tional beam symmetry and two solenoids that are used to match the beam to the cyclotron acceptance. A buncher is installed to increase the injection efficiency. The design ap-proach for the central region is discussed. The design and optical properties of the injection line is discussed