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Polarization modulation is a powerful technique to increase the stability ofmeasurements by enabling the distinction of a polarized signal from dominantslow system drifts and unpolarized foregrounds. Furthermore, when placed asclose to the sky as possible, modulation can reduce systematic errors frominstrument polarization. In this work, we introduce the design and preliminarydrive system laboratory performance of a new 60 cm diameter reflectivehalf-wave plate (RHWP) polarization modulator. The wave plate consists of awire array situated in front of a flat mirror. Using \mbox{50 $\mu$m} diameterwires with \mbox{175 $\mu$m} spacing, the wave plate will be suitable foroperation in the millimeter wavelength range with flatness of the wires andparallelism to the mirror held to a small fraction of a wavelength. Thepresented design targets the 77--108 GHz range. Modulation is performed by arotation of the wave plate with a custom rotary drive utilizing an activelycontrolled servo motor.

Construction of a Large Diameter Reflective Half-Wave Plate Modulator for Millimeter Wave Applications