POLARBEAR-2
Predecessor Experiment:
POLARBEAR Collaboration
POLARBEAR-2 (PB-2) is a ground-based experiment to measure the polarization of the cosmic microwave background (CMB) located at the Atacama desert (5200 m in altitude) in Chile. The science goals of the POLARBEAR-2 are i) to detect or set an upper limit of the inflationary gravitational wave B-mode with the sensitivity of r = 0.01 with 95% C.L. and ii) to measure the weak gravitational lensing B-mode signal and extract the information, such as the sum of neutrino masses with the limit of 90 meV by PB-2 alone and 65 meV by combining PB-2 and Planck at 68% CL. PB-2 observes at the 95 and 150 GHz bands simultaneously using the dichroic dual-polarization antenna-coupled transition edge sensor bolometers together with SQUIDs and the frequency domain multiplexing readout system. The total number of the detectors with the two bands are 7855 that are 6 times more than that of POLARBEAR-1, and the expected focal plane combined statistical sensitivity is 5.7 µK√s with the beam size of 5.2 and3.5 arcmin for the 95 and 150 GHz bands, respectively. The polarization signal is modulated by the sky rotation and the continuously rotating half-wave plate. PB-2 is scheduled to deploy in 2014. The PB-2 receiver will be mounted on the new telescope, which has the same design as the Huan Tran telescope (HTT). We present the overview of PB-2 and discuss the project status.
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