Historical development and current status of transverse beam feedback system

For the storage rings, there are always large numbers bunches and beam current in them, due to the resistive wall impedance and high order modes, strong beam instability will occur and cause beam current limit and beam loss. There are many methods to relieve this phenomenon. But the beam feedback system is almost the most effective way to suppress beam instability and large oscillations caused by beam injection among these methods. Therefore, it is an important guarantee for improving beam quality. This article will introduce the historical development and current status of the transverse beam feedback systems all over the world, the details of every part of transverse feedback system, such as signal detection unit, front-end electronics unit, signal processing electronics unit, and so on, and its recent new technologies and advances.