Log-ratio-circuit-based turn-by-turn system of HLS

During the phase II project of NSRL, in order to monitor the injecting effectiveness, damping rate and b oscillation after update of injection and RF system, a turn-by-turn system of HLS has been proposed for storage ring diagnostics. The system employs a log-ratio electronics circuit to characterize machine properties of the updated HLS storage ring. Since the system is based on synchronous process with HLS RF (204MHz) and logarithmically demodulation, that is the electronics working at bunch pas s frequency, so reduce the complexity of signal procession chain and make it easy to implement. On the other hand, the highlighted features of the log-ratio technique such as low noise, high bandwidth and wide dynamic range, as well as response linearity are superior compared with the familiar Di