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The Wake Field Monitor (WFM) system installed on the CLIC prototypeaccelerating structure in CERN Linear Accelerator for Research (CLEAR) has twochannels for each horizontal/vertical plane, operating at differentfrequencies. When moving the beam relative to the aperture of the structure, adisagreement is observed between the center position of the structure asmeasured with the two channels in each plane. This is a challenge for theplanned use of WFMs in the Compact Linear Collider (CLIC), where they will beused to measure the center offset between the accelerating structures and thebeam. Through a mixture of simulations and measurements, we have discovered apotential mechanism for this, which is discussed along with implications forimproving position resolution near the structure center, and the possibilitydetermination of the sign of the beam offset.

CLIC Wake Field Monitor as a detuned Cavity Beam Position Monitor: Explanation of center offset between TE and TM channels in the TD26 structure