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The POLARBEAR-2 (PB-2) and Simons Array are upgrade projects of POLARBEAR-1 experiment. They are ground-based Cosmic Microwave Background (CMB) polarization experiments at Atacama in Chile. PB-2, the first newly designed receiver on the one of the Simons Array telescopes, will be deployed in 2015. The PB-2 receiver has 1,897 lenslet-coupled pixels on the focal plane, each of which is dual-polarization and dual frequency (95/150 GHz) with total of 7.588 Transition Edge Sensors (TES) bolometric detectors. The expected noise equivalent temperature of the PB-2 receiver is 5.8 μK √ s for 95 GHz and 150 GHz. The PB-2 has advantages of high sensitivity, high angular resolution, dual frequency observation, accessibility to a large sky and cost-efficient scalability to the full Simons Array project. These features allow us to investigate the inflationary and lensing CMB B-mode polarization in detail as a next generation experiment.

POLARBEAR-2 receiver system on the Simons Array telescopes for CMB polarization measurements