PolarBeaR: Polarization of Background Radiation



  · Project Overview

  · Instrument
    · Optics
    · HWP
    · Detector
    · Multiplexor
    · Readout
    » Cryogenics
    · Telescope

  · Technology

  · Science

  · Collaboration

  · Talks and Papers



The Cryostat is designed to cool the lenses to about 4K and the bolometers down to 280mK. This is accomplished with two cryogenic technologies. A pulse-tube cooler is used to bring the cold plate to about 4K, then a helium sorption cooler brings the detector to 280mK.