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                                 Abstract:An ion induced coupled-bunch instability observed in the Beijing Electron-Positron Collider (BEPC) is analyzed in the paper, with the given side-band of the instability. A linear two-beam theory of ion trapping is applied to calculate the threshold current and growth time of the instability. A simulation program based on the strong weak model is developed to track the interaction process between the beam and the ion cloud. The simulation results successfully reproduce the side-band and give a reasonable growth time of the instability.
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                        References
	
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