先进光源升级工程蓄电池环数字化低电平RF控制系统
Digital Low-Level RF control system for Accumulator Ring at Advanced Light Source Upgrade Project
摘要：
目前ALS正在升级到ALSU，以产生100倍亮度的软X射线光。蓄电池环（AR）的LLRF系统由两个相同的LLRF站组成，用于驱动RF放大器。在片上系统架构下，使用非IQ数字下变频和模拟上/下变频，闭环RF幅度和相稳定性分别测量为$< 0.1\%$和$< 0.1^\circ$。实时互锁系统通过$< 2 μ$的延迟实现，用于防止电弧闪光和意外射频功率的机器保护。控制接口的开发使PLC-FPGA-EPICS通信，以支持操作，定时，腔调谐和联锁系统。LLRF系统处理桶的对准，以通过两个腔之间的同步相位环路斜坡在AR和存储环之间交换光束。该系统还包括一个优化程序，用于表征回路动态特性，并使用内置网络分析仪功能确定最佳操作点。一个31 kHz带宽的腔仿真器集成的LLRF系统，以验证整个系统的性能正在开发。
英文摘要：
Currently ALS is undergoing an upgrade to ALSU to produce 100 times brighter soft X-ray light. The LLRF system for Accumulator Ring (AR) is composed of two identical LLRF stations, for driving RF amplifiers. The closed loop RF amplitude and phase stability is measured as $< 0.1\%$ and $< 0.1^\circ$ respectively, using the non-IQ digital down conversion together with analog up/down conversion, under a system-on-chip architecture. Realtime interlock system is implemented with $< 2 μ$s latency, for machine protection against arc flash and unexpected RF power. Control interfaces are developed to enable PLC-FPGA-EPICS communication to support operation, timing, cavity tuning, and interlock systems. The LLRF system handles alignment of buckets to swap beams between AR and Storage Ring by synchronous phase loop ramping between the two cavities. The system also includes an optimization routine to characterize the loop dynamics and determine optimal operating point using a built-in network analyzer feature. A cavity emulator of 31 kHz bandwidth is integrated with the LLRF system to validate the performance of the overall system being developed.
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