The CAPMAP instrument, a four-element 90 GHz correlation polarimeter array, was built, calibrated, and shown to be sensitive enough to measure the CMB E-mode polarization at multipoles 500 to 1500.
An Instrument for Investigating the Large Angular Scale Polarization of the Cosmic Microwave Background
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abstract
We describe the design and performance of a microwave polarimeter used to make precision measurements of polarized astrophysical radiation in three microwave frequency bands spanning 26-36 GHz. The instrument uses cooled HEMT amplifiers in a correlation polarimeter configuration to achieve high sensitivity and long-term stability. The instrument demonstrates long term stability and has produced the most restrictive upper limits to date on the large angular scale polarization of the 2.7 K cosmic microwave background radiation.
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CAPMAP: A New Instrument to Measure the E-mode CMB Polarization on Angular Scales of 4 arcmin to 40 arcmin
The CAPMAP instrument, a four-element 90 GHz correlation polarimeter array, was built, calibrated, and shown to be sensitive enough to measure the CMB E-mode polarization at multipoles 500 to 1500.