Systematic effects from an ambient-temperature, continuously rotating half-wave plate.
Systematic effects from an ambient-temperature, continuously rotating half-wave plate.
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环境温度下连续旋转的半波片的系统效应。
DOI：
10.1063/1.4962023
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
K. Visnjic
中科院分区：
文献类型：
--
作者：
T. Essinger;T. Essinger;Akito Kusaka;Akito Kusaka;J. Appel;J. Appel;Steve K. Choi;K. Crowley;S. Ho;N. Jarosik;L. Page;L. Parker;L. Parker;S. Raghunathan;S. Raghunathan;S. Simon;S. Staggs;K. Visnjic
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阿塔卡马B模式搜索（ABS）实验位于智利阿塔卡马沙漠的系统效应的评估。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（宇宙微波背景（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。我们报告了一个标量泄漏为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。在此水平下的偶极和四极泄漏导致系统误差在r <0.01，在任何缓解之前，由于扫描交联或旋转。在进行任何数据校正（如所谓的解投影）之前，测量的标量泄漏以及偶极子和四极子泄漏的理论水平对ABS测量和焦平面布局产生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从其HWP，并显示连续旋转HWP为未来的实验的承诺。
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 (Cosmic Microwave Background (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 been 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.
Q/U 成像实验仪
DOI：
10.1088/0004-637x/768/1/9
发表时间：
2013
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Bischoff C
通讯作者：
Bischoff C