基于对数比电路的HLS turn-by-turn系统  

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

作　　者：王筠华[1] 李为民[1] 孙葆根[1] 刘祖平[1] 刘建宏[1] 裴元吉[1] 王贵诚[1] 

机构地区：[1]中国科学技术大学国家同步辐射实验室,安徽合肥230029

出　　处：《强激光与粒子束》2002年第4期485-488,共4页High Power Laser and Particle Beams

基　　金：国家重点项目 NSRL二期工程资助课题

摘　　要：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 2 0 4MHz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 (204 MHz) and logarithmically demodulation, that is the electronics working at bunch pass 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 Difference/Sum and AM/PM method. The log-ratio processors at 204 MHz are applied to detecting 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.

关 键 词：对数比电路 HLSturn-by-turn系统 逐圈束流位置测量 束流位置监测器 相空间测量 注入系统 信号处理 储存环 合肥光源 束流动力学 

分 类 号：TL594[核科学技术—核技术及应用] TN911.7[电子电信—通信与信息系统]