DESIGN STUDY OF THE AXIAL INJECTION SYSTEM OF C400 CYCLOTRON

The axial injection system is the part of cyclotron C400 for Hadron therapy developing IBA (Louvain-la-Neuve, Belgium) [1] in collaboration with JINR (Dubna, Russia). It is designed for transportation of three species of ions: carbon 12 C 6+ , helium 4 He 2+ and hydrogen 2 H 1+ into the median plane of cyclotron. Results of simulations of the ion beam injection and parameters of this beam transportation line are presented. STRUCTURE OF INJECTION CHANNEL General type of the axial injection system is shown in Fig. 1. The ion source injects directly into the switching magnet, which is also used as a charge state analyzing magnet. The ion source exit electrode is located at 40 cm from the entrance of the magnet (effective field boundary). Between the source insulator and the magnet entrance we provide a cube to connect a vacuum pump and install a removable beam stop to measure the total current extracted from the ion source. The input face angle of the 90° magnet is selected to focus the beam into the analyzing slits which are located in a cube located just after the second magnet. The first magnet, to be used for the Carbon ECR source (and perhaps for an optional ion source for Lithium) has a bending radius of 40 cm. The second magnet, to be used for the alpha and for the 2 H 1+