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Hrubes, J. D. Vieira, J. E. Austermann, J. E. Carlstrom, J. E. Ruhl, J. Gallicchio, J. Gao, J. Hubmayr, J. J. McMahon, J. Mehl, J. P. Nibarger, J.T. Sayre, J. W. Henning, K. A. Aird, K. D. Irwin, K. K. Schaffer, K. T. Story, K. Vanderlinde, L. E. Bleem, L. Knox, L. Mocanu, M. A. Dobbs, N. Harrington, N. Huang, N. W. Halverson, N. Whitehorn, O. Zahn, P. A. R. Ade, R. Citron, R. Keisler, S. Hoover, S. Padin, S. S. Meyer, T. de Haan, T. M. Crawford, T. Natoli, V. Novosad, V. Yefremenko, W. Everett, W. L. Holzapfel, Z. Hou","submitted_at":"2015-03-08T19:55:38Z","abstract_excerpt":"We present a measurement of the $B$-mode polarization power spectrum (the $BB$ spectrum) from 100 $\\mathrm{deg}^2$ of sky observed with SPTpol, a polarization-sensitive receiver currently installed on the South Pole Telescope. The observations used in this work were taken during 2012 and early 2013 and include data in spectral bands centered at 95 and 150 GHz. 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A. Stark, A. Gilbert, A. N. Bender, A. T. Crites, A. T. Lee, B. A. Benson, B. R. Saliwanchik, C. L. Chang, C. L. Reichardt, C. Pryke, C. Tucker, D. Hanson, D. Li, D. Luong-Van, D. P. Marrone, E. M. George, E. M. Leitch, E. Shirokoff, G. C. Hilton, G. P. Holder, G. Smecher, G. Wang, H. C. Chiang, H-M. Cho, J. A. Beall, J. D. Hrubes, J. D. Vieira, J. E. Austermann, J. E. Carlstrom, J. E. Ruhl, J. Gallicchio, J. Gao, J. Hubmayr, J. J. McMahon, J. Mehl, J. P. Nibarger, J.T. Sayre, J. W. Henning, K. A. Aird, K. D. Irwin, K. K. Schaffer, K. T. Story, K. Vanderlinde, L. E. Bleem, L. Knox, L. Mocanu, M. A. Dobbs, N. Harrington, N. Huang, N. W. Halverson, N. Whitehorn, O. Zahn, P. A. R. Ade, R. Citron, R. Keisler, S. Hoover, S. Padin, S. S. Meyer, T. de Haan, T. M. Crawford, T. Natoli, V. Novosad, V. Yefremenko, W. Everett, W. L. Holzapfel, Z. 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