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为进一步提升光源性能,需要对加速器非线性束流动力学问题、宽带束流阻抗问题、恒流模式下注入脉冲引入的束流位置扰动问题进行研究,从而优化新增设备阻抗、优化束团填充模式、优化注入模式,提高不稳定性流强阈值。而逐束团诊断技术的研究,是达成上述目标的技术基础。上海光源研制了一套逐束团数据采集系统,该系统主要由RF前端、数据采集卡和EPICS软件三部分组成。RF前端将束团信号展宽到2 ns,利用四路采样率为125 MHz的ADC组成等效的500 MHz逐束团采样,利用EPICS实现后续信号处理。在线测试结果表明,系统可准确检测逐束团位置信息,并可获得逐束团工作点,为机器研究提供了有力手段。
In order to further improve the performance of the light source, we need to study the problems of accelerator nonlinear beam dynamics, broadband beam impedance problem, perturbation of the beam position induced by injection pulse under constant current mode, so as to optimize the new device impedance and optimize the bunchfill mode , Optimize the injection mode, improve the instability flow intensity threshold. The study of diagnostic technology by bunch, which is the technical basis for achieving the above goals. Shanghai Light Source developed a bunch of data acquisition system by bunch, the system mainly by the RF front-end, data acquisition card and EPICS software consists of three parts. The RF front-end broadens the bunched signal to 2 ns, computes an equivalent 500-MHz, bunch-by-bunch sample using an ADC with a quad sample rate of 125 MHz and uses EPICS for subsequent signal processing. The online test results show that the system can accurately detect the position information of each bunch and obtain the bunch-by-bunch working point, which provides a powerful tool for machine research.