Spiral inflector and central region study for three cyclotrons at CIAE

The beam dynamics behaviour in the compact cyclotron central region is investigated. The design study for central region, including the spiral inflector, Dee tip, shield and posts, for three cyclotrons at CIAE will be described in this paper. The code development by CIAE and the UNIX based codes developed by TRIUMF were implemented on WINDOWS/PC by CIAE for the spiral inflector and central region design will be given too.