<p>The dynamic vacuum effect is the primary constraint on beam intensity in high-intensity heavy-ion synchrotrons. The dynamic vacuum effect induced by the charge exchange beam loss significantly limits the ion intensity and beam lifetime in the booster ring (BRing) of the HIAF. The collimator is a critical and indispensable component for mitigating the dynamic vacuum effect in high-intensity heavy-ion circular accelerators. A dedicated collimation system was designed for BRing to decrease ion-induced gas desorption and suppress the dynamic vacuum effect. Nevertheless, this intercepting structure may introduce longitudinal and transverse beam-coupling impedances in BRing. In this study, comprehensive investigations were conducted to characterize the beam-coupling impedance of a movable collimator. Furthermore, we systematically describe the results of the single- and two-wire bench transmission measurements and numerical simulations. Satisfactory agreement was obtained between the numerical simulations and wire transmission bench measurements. The heat deposition power on each part of the collimator due to the longitudinal impedance was evaluated. The 24 movable collimators were processed and entered the online installation stage of the Booster Ring.</p>