The resonant frequency of the ferrite-loaded cavities used in the future China Spallation Neutron Source (CSNS)sweeps from 1.02MHz to 2.42MHz.The ferrite property is very important to the accelerator structure in the CSNS ring.A primary experiment was set up to measure theμrQf value and the power density of different ferrite materials.According to the comparison results,4M2 ferrite rings were chosen to meet the requirement of CSNS.
