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  • Chuss, David T; Eimer, Joseph R; Fixsen, Dale J; Hinderks, James; Kogut, Alan J; Lazear, Justin; Mirel, Paul; Switzer, Eric; Voellmer, George M; Wollack, Edward J

    arXiv.org, 05/2014
    Paper, Journal Article

    We describe the design, construction, and initial validation of the variable-delay polarization modulator (VPM) designed for the PIPER cosmic microwave background polarimeter. The VPM modulates between linear and circular polarization by introducing a variable phase delay between orthogonal linear polarizations. Each VPM has a diameter of 39 cm and is engineered to operate in a cryogenic environment (1.5 K). We describe the mechanical design and performance of the kinematic double-blade flexure and drive mechanism along with the construction of the high precision wire grid polarizers.