DESIGN AND SIMULATION OF CAVITY FOR 18 MeV CYCLOTRONS

RF system is the key part of the cyclotron and cavity is the key part of RF systems. The basic parameters of cavity design are the resonant frequency, Dee voltage, RF phase and RF power. Proper operation of the cavity depends on the suitable voltage distribution in accelerating gap, phase stability in the cavity and as well as optimal scattering parameters. In this simulation using CST MWS, different parts of the cavity such as Stem and Dee are optimized to achieve optimum dimensions for the desired resonant frequency, Dee voltage and RF power. Main properties of the designed cavity are resonant frequency at 64.3 MHz, Dee voltage of 45 kV and RF power of 11 kW. INTRODUCTION IRANCYC-18 is an 18 MeV compact low energy cyclotron for short life medical isotope production. The RF system is designed to accelerate 150 μA of H− ions to 18 MeV. The RF specifications are shown in Table 1. Table 1: Main RF Specifications