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The White Mountain Polarimeter (WMPol) is a dedicated ground-based microwavetelescope and receiver system for observing polarization of the CosmicMicrowave Background. WMPol is located at an altitude of 3880 meters on aplateau in the White Mountains of Eastern California, USA, at the BarcroftFacility of the University of California White Mountain Research Station.Presented here is a description of the instrument and the data collected duringApril through October 2004. We set an upper limit on $E$-mode polarization of14 $\mu\mathrm{K}$ (95% confidence limit) in the multipole range$170<\ell<240$. This result was obtained with 422 hours of observations of a 3$\mathrm{deg}^2$ sky area about the North Celestial Pole, using a 42 GHzpolarimeter. This upper limit is consistent with $EE$ polarization predictedfrom a standard $\Lambda$-CDM concordance model.

The White Mountain Polarimeter Telescope and an Upper Limit on CMB Polarization