Research of BEPCⅡ 0-mode beam feedback system

The BEPCⅡ is a double-ring collider with high current(0.91 A) and lots of,which had bunches(93 bunches). In order to inhibit the longitudinal oscillation (0-mode), a 0-mode beam feedback system was used never been used at the storage ring of the BEPCⅡ. It is made up of beam signal collection, filter, down conversion, phase detectior, phase shifter, etc. When the system runs, the longitudinal sideband will be suppressed by more than 10 dB. It shows that the system can inhibits the longitudinal oscillation effectively.