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In beam-driven plasma wakefield acceleration (PWFA) facilities, highly precise measurement of beam arrival time is crucial, as it is a key physical parameter determining acceleration efficiency and beam quality. Two beam arrival time monitors (BAMs) are installed in the PWFA beamline 2 at the Institute of High Energy Physics (IHEP), each monitor employs a dual cavity design operating in the TM010 mode. The radio frequency signals from individual cavities are down-converted to obtain intermediate frequency signals, whose phases encode the beam arrival time at the respective cavity location. By mixing the output signals from the two cavities with different resonant frequencies, the beam transit time between the cavity positions is determined. This paper presents the design and offline test results of the BAMs, along with an overall evaluation of the system resolution based on laboratory measurements.
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