Upgrade of the LNS Superconducting Cyclotron

A. Calanna, L. Calabretta, D. Rifuggiato, G. Cuttone, G. D’Agostino, M. Maggiore, A. Radovinsky

The INFN-LNS Superconducting Cyclotron (CS) has been working for about 20 years delivering ion beams from protons to gold in the wide energy range from 10 A MeV to 80 A MeV. The beam extraction is presently accomplished by means of two electrostatic deflectors and a set of magnetic channels. Recently, the experiment NUMEN [1, 2] has been highly recommended by the scientific community. The requirements on target are light ion beams (A<30 amu), within an energy range of 15-60 A MeV and a beam power of 5-10 kW, which means to increase the extracted power by a factor 10-100. To achieve this goal we have studied extraction by stripping using the existing extraction channel with an increased transversal section. In addition, a new extraction channel has been designed to broaden as much as possible the range of the extracted ions and energies. To allow the realization of these new channels, a new superconducting magnet is needed including a new cryostat. The major changes and the expected performances for the upgraded cyclotron, as well as the state-of-art of the design, are presented.

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