Prototype bunch killer system at SRRC

The prototype bunch killer has been set up at SRRC recently. The system includes two subsystems, the multibunch filling pattern shaping system and single bunch killer system. The gate RF knockout approach is used to shape the filling pattern of multibunch and to obtain a well-defined gap for machine study. The gate processes synchronize with revolution frequency. Widths of the gate signal determine the empty gap of the filling pattern. Beam knockout systems with nanosecond impulse current are also implemented which used to kill the individual electron bunch with bucket addressing capability. The purity of the single bunch is improve by the nanosecond knockout system, despite the difference of the tune and tune spread of the main and parasitic bunches, that lifts the requirement of the narrow tune spread for standard single bunch purification process. The nanosecond knockout technique also applied to kill undesired bunches in the multibunch operation mode. The preliminary results are presented