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.
New Limits on the Polarized Anisotropy of the Cosmic Microwave Background at Subdegree Angular Scales
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abstract
We update the limit from the 90 GHz PIQUE ground-based polarimeter on the magnitude of any polarized anisotropy of the cosmic microwave radiation. With a second year of data, we have now limited both Q and U on a ring of 1 degree radius. The window functions are broad: for E-mode polarization, the effective l is <l> = 191 +143 -132. We find that the E-mode signal can be no greater than 8.4 microK (95% CL), assuming no B-mode polarization. Limits on a possible B-mode signal are also presented.
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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.