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SPTpol is a dual-frequency polarization-sensitive camera that was deployed onthe 10-meter South Pole Telescope in January 2012. SPTpol will measure thepolarization anisotropy of the cosmic microwave background (CMB) on angularscales spanning an arcminute to several degrees. The polarization sensitivityof SPTpol will enable a detection of the CMB "B-mode" polarization from thedetection of the gravitational lensing of the CMB by large scale structure, anda detection or improved upper limit on a primordial signal due to inflationarygravity waves. The two measurements can be used to constrain the sum of theneutrino masses and the energy scale of inflation. These science goals can beachieved through the polarization sensitivity of the SPTpol camera and carefulcontrol of systematics. The SPTpol camera consists of 768 pixels, eachcontaining two transition-edge sensor (TES) bolometers coupled to orthogonalpolarizations, and a total of 1536 bolometers. The pixels are sensitive tolight in one of two frequency bands centered at 90 and 150 GHz, with 180 pixelsat 90 GHz and 588 pixels at 150 GHz. The SPTpol design has several featuresdesigned to control polarization systematics, including: single-moded feedhornswith low cross-polarization, bolometer pairs well-matched to differenceatmospheric signals, an improved ground shield design based on far-sidelobemeasurements of the SPT, and a small beam to reduce temperature to polarizationleakage. We present an overview of the SPTpol instrument design, projectstatus, and science projections.

SPTpol: an instrument for CMB polarization measurements with the South Pole Telescope