Modulation of cosmic microwave background polarization with a warm rapidly rotating half-wave plate on the Atacama B-Mode Search instrument.
Modulation of cosmic microwave background polarization with a warm rapidly rotating half-wave plate on the Atacama B-Mode Search instrument.
复制标题
在阿塔卡马 B 模式搜索仪器上用温暖的快速旋转半波片调制宇宙微波背景偏振。
DOI：
10.1063/1.4862058
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
K. Visnjic
中科院分区：
文献类型：
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作者：
A. Kusaka;T. Essinger;J. Appel;P. Gallardo;K. Irwin;N. Jarosik;M. Nolta;L. Page;L. Parker;S. Raghunathan;J. Sievers;S. Simon;S. Staggs;K. Visnjic
我们使用一个快速旋转的半波片(HWP)评估了在阿塔卡马B模式搜索中宇宙微波背景极化的调制。在对时序数据(TOD)进行解调后，我们发现大气起伏明显减小。解调后的TOD对S来说，在500-1000的时间尺度上是稳定的，对应的频率是1-2 MHz。这有助于在大角度尺度上恢复宇宙学信息，这些信息通常只能从气球载或卫星实验中获得。这项技术还实现了对天体偏振的灵敏测量，而不会影响对两个正交线偏振敏感的成对探测器的TOD。这是第一次展示了使用快速旋转的HWP从地面平台上消除这些水平的大气污染的能力。
We evaluate the modulation of cosmic microwave background polarization using a rapidly rotating, half-wave plate (HWP) on the Atacama B-Mode Search. After demodulating the time-ordered-data (TOD), we find a significant reduction of atmospheric fluctuations. The demodulated TOD is stable on time scales of 500-1000 s, corresponding to frequencies of 1-2 mHz. This facilitates recovery of cosmological information at large angular scales, which are typically available only from balloon-borne or satellite experiments. This technique also achieves a sensitive measurement of celestial polarization without differencing the TOD of paired detectors sensitive to two orthogonal linear polarizations. This is the first demonstration of the ability to remove atmospheric contamination at these levels from a ground-based platform using a rapidly rotating HWP.