MEASUREMENT OF BEAM PHASE USING PHASE PROBE AT THE NIRS-930 CYCLOTRON

The NIRS-930 cyclotron of the National Institute of Radiological Sciences (NIRS) has been used for production of short-lived radio-pharmaceuticals for PET, research of physics, developments of particle detectors in space, and so on[1]. The NIRS-930 has twelve trim coils for generation of the isochronous fields. Until recently, currents of the twelve trim coils had been adjusted only by monitoring the output beam intensity. In order to exactly produce the isochronous fields, a phase probe has been installed in the NIRS-930. The beam phase excursion could be reduced within 10 degree