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POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarizationexperiment that will be located in the Atacama highland in Chile at an altitudeof 5200 m. Its science goals are to measure the CMB polarization signalsoriginating from both primordial gravitational waves and weak lensing. PB-2 isdesigned to measure the tensor to scalar ratio, r, with precision {\sigma}(r) <0.01, and the sum of neutrino masses, {\Sigma}m{\nu}, with{\sigma}({\Sigma}m{\nu}) < 90 meV. To achieve these goals, PB-2 will employ7588 transition-edge sensor bolometers at 95 GHz and 150 GHz, which will beoperated at the base temperature of 250 mK. Science observations will begin in2017.

POLARBEAR-2: an instrument for CMB polarization measurements