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TY - UNPB AU - Teytelman, D. ED - Zhao, Ning ED - Poole, John ED - Schaa, Volker RW TI - An Overview of Active Coupled-bunch Instability Control J2 - Proc. of eeFACT2016, Daresbury, UK, October 24-27, 2016 C1 - Daresbury, UK T2 - ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e^+e^- Colliders T3 - 58 LA - english AB - Feedback control of coupled bunch instabilities has become an ubiquitous feature of modern electron and positron storage rings. Instabilities due to impedances (resistive wall, RF cavity fundamental and higher order modes, resonant modes elsewhere in the ring) as well as effects from ions and electron cloud have all been successfully suppressed by such systems. But feedback is not a panacea, like any physical system it has internal dynamics and noise which limit its effectiveness. With the new aggressive machine designs, it is especially important to understand these limitations. In this work I will describe the topology of the modern instability control system, emphasizing the limiting factors. Whenever possible, simplified scaling relations will be introduced in order to help in the machine design process. Presentation of the current methods will be followed by a discussion of promising future research directions that should help extend the reach of such feedback control. PB - JACoW CP - Geneva, Switzerland ER -