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LCLS-II, the next-generation X-ray free-electron laser at SLAC National Accelerator Laboratory, will employ a continuous-wave 4 GeV superconducting linear accelerator with a nominal bunch spacing of 1 μs to deliver both soft and hard X-ray FEL radiation to experimental users. To meet the stringent beam diagnostics requirements of this facility, the SLAC Technical Innovation Directorate has developed a unified hardware and firmware platform for beam instrumentation based on the Advanced Telecommunications Computing Architecture (ATCA) crate standard. Leveraging this platform, we have designed a beam position monitor (BPM) system incorporating both stripline and cavity BPM pickups, capable of measuring beam position at the full repetition rate of the machine. The system is designed to operate over a wide dynamic range, accommodating bunch charges from 1 pC to 300 pC. This paper presents the design of the BPM electronics, describes the overall system architecture, and reports on performance results obtained during testing on the existing LCLS-II accelerator.
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