Magnet design studies for the European Light Ion Medical Accelerator

The initial results of the magnet design study of the superconducting separated sector cyclotron that is considered as a viable solution for the European Light Ion Medical Accelerator are presented. The parameters of the superconducting coil and the yoke structure were determined so that the sector angular width and spiral angle (which determine the focusing and isochronism of the accelerated ¹⁶O⁸⁺ beam in this fixed energy machine) could be derived. The design of the magnetic field in this machine concept is strongly coupled to the mechanical structure of the yoke and other machine components. As far as beam dynamics is concerned, the sensitivity of the working path on the precise spiral shape of the poles should be noted, implying the importance of tight tolerances that should be met in the engineering design if ease of operation and high beam intensity are to be achieved