Improved polarization calibration of the BICEP3 CMB polarimeter at the South Pole

Improved polarization calibration of the BICEP3 CMB polarimeter at the South Pole
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改进了 BICEP3 CMB 偏振计在南极的偏振校准

DOI:
10.1117/12.2620212
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发表时间:
2022
期刊:
Proceedings of the SPIE
影响因子:
--
通讯作者:
Bock, James J.
Bock, James J.
中科院分区:
--
文献类型:
--
作者:
Cornelison, James;Verges, Clara;Ade, P A.;Ahmed, Zeeshan;Amiri, Mandana;Barkats, Denis;Basu Thakur, Ritoban;Beck, Dominic;Bischoff, Colin A.;Bock, James J.

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BICEP 3偏振计是一种小口径折射望远镜,致力于观测95 GHz的宇宙微波背景(CMB)。它的设计目标是度角尺度偏振模式,特别是非常受欢迎的原始B模式信号,这是宇宙膨胀的独特特征。来自天空的偏振信号通过差分共定位的正交偏振超导过渡边缘传感器(TES)测辐射热计重建。在这项工作中,我们提出了绝对测量的探测器的偏振响应超过约800个功能探测器对的BICEP 3实验,出了总数约1000。我们使用专门设计的旋转偏振源(RPS)来测量多个源和望远镜望远镜旋转角度下的偏振响应,以完全映射360度的响应。我们在这里介绍了从2022年1月采集的现场校准数据中提取的偏振特性。在2018年进行了类似的校准活动,但我们发现我们的约束主要是由系统学控制的,大约为0.5°。在对校准装置进行了一系列改进后,我们现在能够报告显著降低的系统污染水平。在未来,这种精确的测量将被用来限制标准宇宙学模型之外的物理学,即宇宙双折射。
The BICEP3 Polarimeter is a small aperture, refracting telescope, dedicated to the observation of the Cosmic Microwave Background (CMB) at 95GHz. It is designed to target degree angular scale polarization patterns, in particular the very-much-sought-after primordial B-mode signal, which is a unique signature of cosmic inflation. The polarized signal from the sky is reconstructed by differencing co-localized, orthogonally polarized superconducting Transition Edge Sensor (TES) bolometers. In this work, we present absolute measurements of the polarization response of the detectors for more than approximately 800 functioning detector pairs of the BICEP3 experiment, out of a total of approximately 1000. We use a specifically designed Rotating Polarized Source (RPS) to measure the polarization response at multiple source and telescope boresight rotation angles, to fully map the response over 360 degrees. We present here polarization properties extracted from on-site calibration data taken in January 2022. A similar calibration campaign was performed in 2018, but we found that our constraint was dominated by systematics on the level of approximately 0.5° . After a number of improvements to the calibration set-up, we are now able to report a significantly lower level of systematic contamination. In the future, such precise measurements will be used to constrain physics beyond the standard cosmological model, namely cosmic birefringence.
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影响因子: --
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发表时间: 2011-02-01
影响因子: 8.7
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