Beam injection and extraction system of RIKEN Ring Cyclotron

From September to December 1985, we carried out comprehensive magnetic field measurements, installing the beam injection and extraction elements at each due position. The magnetic field maps inside the elements as well as those in the sector magnets were measured. The magetic field distributions inside the elements were obtained nearly as expected. On the basis of these data, small modifications were made for some of the elements to improve the distributions. The magnetic field perturbations in the sector magnets could be corrected by the trim coils. At present, October 1986, the whole systems of the RIKEN Ring Cyclotron have been completely assempled and are on standby for commissioning. Layout of the beam injection and extraction system and functions of its each element are described together with some of the measured data. (author)