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The Hefei Advanced Light Source (HALF) is a fourth-generation diffraction-limited storage ring under construction in China, imposing stringent requirements on its beam position monitor (BPM) system for sub-micron resolution, low-latency fast orbit feedback, and robust long-term stability. This paper presents the comprehensive performance testing of all DBPM developed for the HALF storage ring. The test campaign evaluated each processor in three parallel acquisition modes: turn-by-turn (TBT) at 624.75 kHz, fast acquisition (FA) at 20 kHz and slow acquisition (SA) at 10 Hz. Resolution was characterized under two distinct filling patterns — 20 bunch trains of 36 bunches and 5 bunch trains of 144 bunches — to emulate the planned operational filling schemes of HALF. A simulated beam signal testbed based on an RF signal source was constructed, enabling reproducible and automated batch testing. DBPM also underwent temperature drift characterization within the natural temperature variation range of the test environment, as well as beam current dependence evaluation covering 1–400 mA. The test results show that all DBPMs meet the technical specifications, and the statistical distributions demonstrate high consistency, satisfying the requirements of the HALF project.
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