Precise Measurement of Cosmic Microwave Background Polarization with a Large Superconducting Detector Array
| Project/Area Number |
24684017
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
HASEGAWA MASAYA 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (60435617)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| 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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| Keywords | 宇宙背景放射 / インフレーション / 原始重力波 / 偏光 / 重力レンズ / ニュートリノ質量 / 検出器開発 / 超伝導検出器 |
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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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Report
(4 results)
Research Products
(36 results)
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[Journal Article] Adaptation of frequency-domain readout for Transition Edge Sensor bolometers for the POLARBEAR- 2 Cosmic Microwave Background experiment2013
Author(s)
K.Hattori, K.Arnold, D.Barron, M.Dobbs, T.de Haan, N.Harrington, M.Hasegawa, M.Hazumi, W.L.Holzapfel, B.Keating, A.T.lee, H.Morri, M.J.Myers, G.Smecher, A.Suzuki, T.Tomaru
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Journal Title
Nucl. Instru. and Meth
Volume: A, 732
Pages: 299-302
DOI
Related Report
Peer Reviewed
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