室温连续旋转半波片的系统效应
Systematic effects from an ambient-temperature, continuously-rotating half-wave plate
摘要：
我们提出了一个连续旋转的，环境温度的半波片（HWP）的基础上的两个赛季的数据，从位于智利阿塔卡马沙漠的阿塔卡马B模式搜索（ABS）实验的系统效应的评估。ABS实验是一个灵敏度为145 GHz的微波望远镜。在这里，我们提出了我们在现场评估的天体（CMB加上银河系前景）温度偏振泄漏。我们将泄漏分解为标量、偶极和四极泄漏项。我们报告的标量泄漏约为0.01%，与模型预期一致，并且比其他CMB实验报告的数量级小。没有检测到显著的偶极或四极项;我们将每个项限制为<0.07%（95%置信度），受限于我们测量中的统计不确定性。在由于扫描交联或双极旋转的任何缓解之前，该水平的偶极和四极泄漏导致r<0.01的系统误差。在任何数据校正（例如所谓的解投影）之前，对于ABS勘测和焦平面布局，所测量的标量泄漏以及偶极子和四极泄漏的理论水平产生r<0.001的系统误差。这表明，ABS实现了显着的光束系统误差减轻其HWP和连续旋转HWP为未来的实验显示的承诺。
英文摘要：
We present an evaluation of systematic effects associated with a continuously-rotating, ambient-temperature half-wave plate (HWP) based on two seasons of data from the Atacama B-Mode Search (ABS) experiment located in the Atacama Desert of Chile. The ABS experiment is a microwave telescope sensitive at 145 GHz. Here we present our in-field evaluation of celestial (CMB plus galactic foreground) temperature-to-polarization leakage. We decompose the leakage into scalar, dipole, and quadrupole leakage terms. We report a scalar leakage of ~0.01%, consistent with model expectations and an order of magnitude smaller than other CMB experiments have reported. No significant dipole or quadrupole terms are detected; we constrain each to be <0.07% (95% confidence), limited by statistical uncertainty in our measurement. Dipole and quadrupole leakage at this level lead to systematic error on r<0.01 before any mitigation due to scan cross-linking or boresight rotation. The measured scalar leakage and the theoretical level of dipole and quadrupole leakage produce systematic error of r<0.001 for the ABS survey and focal-plane layout before any data correction such as so-called deprojection. This demonstrates that ABS achieves significant beam systematic error mitigation from its HWP and shows the promise of continuously-rotating HWPs for future experiments.
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