Four bumpers are required for the injection and extraction of CSR. The parameters of the bumpers are shown in table 1. Because of the steep raising and falling time and therefore the inductance of the magnet should be as small as possible, so the material of the magnet cores must be ferrite. And in order to reduce the cost of the bump magnet, the cross-section of the four ferrite cores was designed as the same, as shown in Fig.1.It is very similar to the lamination of the H-type dipole. And Fig.2 is the...