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Description
A new technology research of a high-current H2+ small cyclotron is in progress at China Institute of Atomic Energy. The cyclotron is designed based on a RFQ injection line, which is expected to break through the current limit of the small cyclotron and bring the current of the small cyclotron to above 3mA. This project is designed to achieve a particle energy of 10MeV, and the theoretical design of each system has been completed, preparing to enter the manufacturing stage. This paper mainly introduces the design and research work of the radio-frequency cavity. In order to increase the energy gain per circle to reduce the beam loss, we choose the fourth harmonic, four cavities scheme. Each cavity is a half-wave coaxial resonator, and the four cavities are in the same phase. In order to reduce the complexity of the system, we use a single transmitter to drive the four cavities, and the four cavities are connected together through the head of the Dee plate . This paper expounds the simulation process of the electromagnetic field of the cavity, the optimization process, and the multi-physics
coupling analysis of the cavity. Finally the resonant frequency of the cavity is designed as 36.5MHz, and the quality factor is 5000. The acceleration voltage of the cavity gap is 40kV on average， and the total power loss of the four cavities is 18kW. The design results of the cavity meet the technical requirements， laying the foundation for the construction of project.
