COMPASS is an on-axis 2.6 meter telescope coupled to a correlation polarimeter operating at a wavelength of 1 cm. The entire instrument was built specifically for CMB polarization studies. We report here on observations of February 2001 - April 2001 using this system. We set an upper limit on E-mode polarized anisotropies of 33.5 uK (95% confidence limit) in the l-range 200-600.
@article{arxiv.astro-ph/0308309,
title = {COMPASS: An Upper Limit on CMB Polarization at an Angular Scale of 20 arc minutes},
author = {Philip C. Farese and Giorgio Dall'Oglio and Joshua O. Gundersen and Brian G. Keating and Slade Klawikowski and Lloyd Knox and Alan Levy and Philip M. Lubin and Chris W. O'Dell and Alan Peel and Lucio Piccirillo and John Ruhl and Peter T. Timbie},
journal= {arXiv preprint arXiv:astro-ph/0308309},
year = {2009}
}