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S-band transverse deflecting cavity (TDC) system is being developed at Pohang Accelerator Laboratory (PAL) using its in-house brazing facility. This TDC will be employed for the longitudinal phase-space characterization of electron beams in the eLABs at PAL. Low-power RF tuning is required before high-power conditioning because the input-coupler response and deflecting-mode field distribution must be evaluated together. This work reports the RF design and low-power characterization of the brazed TDC using complex S11 measurements and electromagnetic simulations. During mechanical tuning, phase changes at three characteristic mode frequencies were mapped to a simulation-equivalent coupler-cell radius. The measured and simulated phase changes agreed with an RMS residual of 1.3 degrees. At the 2pi/3-mode frequency, iris-centered perturbation yielded a phase advance of 239.7 degrees, compared with 158.7 degrees for cell-centered perturbation over equal axial intervals. Fixed-frequency three-dimensional field integration also showed larger normalized local Slater terms at iris positions, and low-power RF tuning is ongoing.
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