Three almost-identical rebunchers have been designed for HIRFL-CSR. The first one B1 is going to be taken the off-line test and will be installed in place soon. The rebunchers B1 and B2 are in the BL1 beam line from the injector cyclotron SFC to the main cyclotron SSC, together for the longitudinal matching between the two cyclotrons. The rebuncher B3 is in the BL2 beam line from SSC to the main ring CSRm, either working at the stand-alone mode for the beam from SSC or at the combined mode

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... her with B1 for the beam from SFC. They work at different harmonic modes depending on the beam energy to get the best matching effect. The rebunchers of 22~54MHz for B1 and B2 and 23.5~56MHz for B3 in frequency range and 20~120kV in amplitude use two tuning mechanisms, where the two movable capacitors are for low frequency end and the movable short-circuit panel is for high frequency end.