Improvement of injection system of the AVF cyclotron at RCNP

At the Research Center for Nuclear Physics (RCNP) at Osaka University, the AVF cyclotron is being improved to meet the demand for high-intensity and high-quality beams. One of the improvements is to increase the acceleration voltage of incident ions from 15 kV to a maximum of 50 kV to enable low emittance and high intensity beams. In this presentation, we will report on an injection system consisting of an inflector, central region of Dee electrode, phase slit, etc., which are important for increasing the intensity and quality of a beam. In addition, in order to accelerate the various beams required by RCNP, it is necessary to change accelerating harmonics to 1, 2, 3, and 6 easily. Space charge effects need to be taken into account when considering the incidence of high intensity beams. Therefore, we calculated the beam trajectory using SNOP developed at JINR and OPAL developed at PSI. (author)