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Description
A complete analog readout system designed to extract reference and position signals from a single cavity Beam Position Monitor (cBPM) has been developed for a proto type from CEA Saclay. The complete system underwent beam testing at the Accelerator Test Facility (ATF). The monitor operates with a dipole mode centered at 1.725 GHz, requiring translation to lower frequencies for digitization and subsequent signal processing via a digital-down-conversion (DDC) algorithm. Throughout beam campaigns in May, June, and December 2025, various synchronized local oscil lator (LO) configurations and down-conversion architectures were evaluated. The final optimized systems achieved intermediate fre quencies (IF) of 417 MHz, 297 MHz, and 60 MHz. Through iterative enhancements in synchronization, filtering, and hardware integration, a peak vertical resolution of 2.81 µm was demonstrated.
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