2017 upgrade and performance of BICEP3: a 95GHz refracting telescope for degree-scale CMB polarization

2017 upgrade and performance of BICEP3: a 95GHz refracting telescope for degree-scale CMB polarization
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2017年BICEP3的升级和性能:用于度级CMB偏振的95GHz折射望远镜

DOI:
10.1117/12.2313854
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发表时间:
2018
期刊:
SPIE
影响因子:
--
通讯作者:
Bowens-Rubin, Rachel
Bowens-Rubin, Rachel
中科院分区:
--
文献类型:
--
作者:
Ade, Peter A.;Ahmed, Zeeshan;Aikin, Randol;Alexander, Kate D.;Barkats, Denis;Benton, Steve J.;Bischoff, Colin A.;Bock, James J.;Boenish, Hans;Bowens-Rubin, Rachel

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BICEP3是一个520毫米口径的轴向折射望远镜,用于观测宇宙微波背景(CMB)在95GHz波段的偏振,以寻找来自膨胀引力波的b模信号。BICEP3的焦平面由模块化的天线耦合过渡边缘传感器(TES)辐射计组成。BICEP3于2014- 2015年夏季部署到南极,此后一直投入使用。在2016- 2017年南方夏季,我们对光学元件进行了更改,从而提高了噪声性能。我们讨论了这次升级,并展示了BICEP3在2017年和2018年观测季节的全测绘速度下的性能。与Keck 95GHz接收器相比,BICEP3在映射速度上实现了数量级的提高。验证了BICEP3接收机的噪声性能为6.6μK√s。
BICEP3 is a 520mm aperture on-axis refracting telescope observing the polarization of the cosmic microwave background (CMB) at 95GHz in search of the B-mode signal originating from in ationary gravitational waves. BICEP3's focal plane is populated with modularized tiles of antenna-coupled transition edge sensor (TES) bolometers. BICEP3 was deployed to the South Pole during 2014-15 austral summer and has been operational since. During the 2016-17 austral summer, we implemented changes to optical elements that lead to better noise performance. We discuss this upgrade and show the performance of BICEP3 at its full mapping speed from the 2017 and 2018 observing seasons. BICEP3 achieves an order-of-magnitude improvement in mapping speed compared to a Keck 95GHz receiver. We demonstrate 6.6μK√s noise performance of the BICEP3 receiver.
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