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Variable-delay polarization modulators for cryogenic millimeter-wave applications.

D T Chuss1, J R Eimer2, D J Fixsen1

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Summary
This summary is machine-generated.

We developed a variable-delay polarization modulator (VPM) for cosmic microwave background research. This device precisely controls polarization states for enhanced astronomical observations.

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Area of Science:

  • Cosmology and Astrophysics
  • Instrumental Science

Background:

  • Cosmic Microwave Background (CMB) observations require precise polarization measurements.
  • Existing polarimeters face limitations in modulating polarization states efficiently.

Purpose of the Study:

  • To design and validate a novel Variable-Delay Polarization Modulator (VPM) for the PIPER CMB polarimeter.
  • To enable modulation between linear and circular polarization states for enhanced CMB data.

Main Methods:

  • Detailed description of the VPM's mechanical design, including a kinematic double-blade flexure and drive mechanism.
  • Construction of high-precision wire grid polarizers optimized for cryogenic operation.
  • Validation of the VPM's performance in a 1.5 K cryogenic environment.

Main Results:

  • Successful design and construction of a 39 cm diameter VPM.
  • Demonstration of VPM's capability to introduce variable phase delay between orthogonal linear polarizations.
  • Initial validation confirming performance in cryogenic conditions.

Conclusions:

  • The VPM is a viable instrument for modulating polarization in CMB experiments.
  • The developed VPM enhances the capabilities of the PIPER polarimeter for future CMB studies.
  • The precision engineering of the VPM and its components is suitable for sensitive astrophysical measurements.