| Budget Amount *help |
¥23,660,000 (Direct Cost: ¥18,200,000、Indirect Cost: ¥5,460,000)
Fiscal Year 2014: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2012: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
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| Outline of Final Research Achievements |
The main goals of this study are precise measurement of cosmic microwave background (CMB) polarization with POLARBEAR-1 towards the detection of the special polarization pattern originating primordial gravitational wave (B-modes), and development of a new receiver POLARBEAR-2 which has six times higher mapping speed.
We successfully measured the lensing B-mode power spectrum with CMB data alone at 4.7sigma level. Systematic errors are well controlled, and we proved our technology and observing strategy are promising for the primordial B-mode search.
The development of POLARBEAR-2 receiver is almost completed. One of the challenges is to cool down the large focal plane with more than 7600 detectors to 250mK. We constructed a dedicated optical system with novel lenses and filter with alumina, and successfully controlled the thermal load onto the focal plane. After some laboratory testing, we plan to deploy POLARBEAR-2 in Chile early spring next year, and start data-taking in next summer.
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