DEVELOPMENT OF THE RCNP CYCLOTRON CASCADE

The RCNP AVF cyclotron has recently been upgraded to satisfy a variety of requests by users. A flat-top system was introduced to improve the beam quality and an 18 GHz ECR ion source was built to produce highly charged heavy ions beams. A new beam line was installed to diagnose the characteristics of the beam to be injected into the ring cyclotron as well as to bypass the ring cyclotron and .directly transport low energy beams from AVF to experimental halls. Power supplies of 13 trim coils and magnetic channels were renewed, since it became difficult to get electronic parts to repair them. The control system was replaces by a PC-based distributed system using network. Results of development along the upgrade project are described.