使用逐圈测量系统作为观测手段, 通过对逐圈测量系统采集所得数据进行分析, 判断了数字反馈系统调试过程中的反馈效果。在改变六极铁电流以逐步改变储存环的色品值的过程中, 通过逐圈测量系统观察了束流不稳定性, 计算得到振荡增长时间和阻尼时间分别为0.258 ms和1.172 ms。并测量和计算了工作点、相空间等束流特性参数, 分析了束流靠近和穿越5/9共振线的完整过程。

The digital transverse feedback system is used to suppress the transverse beam instabilities at Hefei Light Source (HLS). During the commissioning of the feedback system, a turn-by-turn measurement system has been adopted to gather beam position information for the assessment of its feedback efficiency. The growth and damping of beam instability were observed by gradually changing the chromaticity through varying the sextupole magnet current. Corresponding growth time and damping time of instability oscillation were calculated to be 0.258 ms and 1.172 ms, respectively. Beam characteristic parameters, such as tune and phase spaces, were measured and calculated. Moreover, the whole process of beam moving near and across the 5/9 resonant line was analyzed.