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J. Bock, J. M. Nagy, J. P. Filippini, J. R. Bond, K. D. Irwin, K. Freese, K. Ganga, K. Megerian, L. M. Fissel, L. Moncelsi, M. Amiri, M. C. Runyan, M. Farhang, M. Galloway, M. Halpern, M. Hasselfield, M. Nolta, N. N. Gandilo, O. Dore, P. A. R. Ade, P. V. Mason, R. Bihary, R. S. Tucker, S. A. Bryan, S. J. Benton, S. Li, T. A. Morford, T. M. Ruud, V. V. Hristov, W. C. Jones, W. Holmes, X. Song, Z. D. Kermish, Z. Huang","submitted_at":"2017-04-01T19:12:21Z","abstract_excerpt":"We present a new upper limit on CMB circular polarization from the 2015 flight of SPIDER, a balloon-borne telescope designed to search for $B$-mode linear polarization from cosmic inflation. Although the level of circular polarization in the CMB is predicted to be very small, experimental limits provide a valuable test of the underlying models. 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