  The untuned magnetic alloy (MA) loaded cavity will be adopted in the recent
proposed projects based on compact proton and heavy-ion synchrotron in China.
The MA loaded cavity has been operated successfully in many accelerators, but
there is no construction and operation experience in China. The small-size MA
cores with outer diameter >100 mm have been supplied by Chinese firms, and the
properties of cores are tested and show good consistency with Hitachi material.
Based on the MA cores testing results, the schematic design of a cavity is
conducted, which could obtain 1 kV gap voltage with less than 1.5 kW power
dissipation in the frequency range of 0.5~7 MHz. The analytic and simulation
results were compared on the resonant frequency, shunt impedance and Q value.
