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Variable-delay Polarization Modulators for Cryogenic Millimeter-wave Applications

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arxiv 1403.1652 v2 pith:3D3LIFQ6 submitted 2014-03-07 astro-ph.IM

David T. Chuss , Joseph R. Eimer , Dale J. Fixsen , James Hinderks , Alan J. Kogut , Justin Lazear , Paul Mirel , Eric Switzer
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George M. Voellmer Edward J. Wollack
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keywords polarizationconstructioncryogenicdescribedesignlinearvariable-delayalong
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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.

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