较详细地介绍了合肥光源逐圈束流位置测量(turn-by-turn)系统设计思想和理论分析.该系统是为了判定二期工程升级后的注入系统的注入效率和Damping率,研究Beta振荡和轨迹瞬时变化以及其他束流动力学问题如工作点变化等的研究而研制.选择了新近受到广泛重视的对数比电路服务束流瞬时位置信号的处理.利用工作在204MHz的对数比电路完成被激励束的turn-by-turn位置测量和相空间检测.给出了该系统各部分性能和理论分析结果,介绍了快速多通道ADC在该系统的数据获取中的应用.

During the phase II project of NSRL, in order to monitor the injecting effectiveness, damping rate and β 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 pass frequency, so reduce the complexity of signal processin 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 Difference/Sum and AM/PM method.The log-ratio processors at 204MHz are applied to detect the various position variations after the beam is excited for two diagnostics: Turn-by-turn and phase space measurement. In this paper the authors describe also the design performance and basic theoretic expectation of the HLS RL-BPM.The electronics system is also presented in details.