Calibration Measurements of the BICEP3 and BICEP Array CMB Polarimeters from 2017 to 2024

Christos Giannakopoulos,Clara Vergès， Cheng Zhang, Silvia Zhang

arXiv · Cosmology and Nongalactic Astrophysics（2024）

Cited 0|Views17

Abstract

The BICEP3 and BICEP Array polarimeters are small-aperture refracting telescopes located at the South Pole designed to measure primordial gravitational wave signatures in the Cosmic Microwave Background (CMB) polarization, predicted by inflation. Constraining the inflationary signal requires not only excellent sensitivity, but also careful control of instrumental systematics. Both instruments use antenna-coupled orthogonally polarized detector pairs, and the polarized sky signal is reconstructed by taking the difference in each detector pair. As a result, the differential response between detectors within a pair becomes an important systematic effect we must control. Additionally, mapping the intensity and polarization response in regions away from the main beam can inform how sidelobe levels affect CMB measurements. Extensive calibration measurements are taken in situ every austral summer for control of instrumental systematics and instrument characterisation. In this work, we detail the set of beam calibration measurements that we conduct on the BICEP receivers, from deep measurements of main beam response to polarized beam response and sidelobe mapping. We discuss the impact of these measurements for instrumental systematics studies and design choices for future CMB receivers.

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【要点】：论文详细介绍了BICEP3和BICEP Array两个宇宙微波背景（CMB）偏振测量仪器的校准测量方法，旨在约束原初引力波信号，并探讨了这些测量对系统误差控制和未来设计的影响。

【方法】：通过使用天线耦合的正交偏振检测器对，并采取每个检测器对的信号差来重建偏振天空信号，从而控制仪器系统误差。

【实验】：每年南半球夏季，作者对BICEP接收器进行一系列校准测量，包括主波束响应的深度测量、偏振波束响应和旁瓣映射，以控制仪器系统误差并进行仪器特性分析。具体数据集名称未在摘要中提及。

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