The Advanced ACTPol 27/39 GHz Array
The Advanced ACTPol 27/39 GHz Array
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先进的 ACTPol 27/39 GHz 阵列
DOI：
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发表时间：
2018
期刊：
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通讯作者：
Edward J. Wollack
中科院分区：
文献类型：
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作者：
S. Simon;J. Beall;N. Cothard;S. Duff;P. Gallardo;S. Ho;J. Hubmayr;B. Koopman;J. McMahon;F. Nati;M. Niemack;S. Staggs;E. Vavagiakis;Edward J. Wollack
先进的ACTPol（AdvACT）将以多个频率和高分辨率观测宇宙微波背景（CMB）的温度和偏振，以改善对膨胀，暗物质和暗能量的约束。来自同步加速器和尘埃辐射的前景是一种污染源，必须在很宽的频率范围内进行表征和去除。因此，AdvACT将在27至230 GHz的五个频段进行观测。我们讨论了27/39 GHz的多色阵列的AdvACT，这将针对在这些频率占主导地位的同步辐射的像素和喇叭天线的设计。为了在前景信号最微弱的39 GHz频带中获得35%的映射速度，通过将像素直径减小到最低频率处的1.08 λ来增加像素数量，这表示与我们之前最紧密包装的像素相比，尺寸减小了22%。
Advanced ACTPol (AdvACT) will observe the temperature and polarization of the cosmic microwave background (CMB) at multiple frequencies and high resolution to place improved constraints on inflation, dark matter, and dark energy. Foregrounds from synchrotron and dust radiation are a source of contamination that must be characterized and removed across a wide range of frequencies. AdvACT will thus observe at five frequency bands from 27 to 230 GHz. We discuss the design of the pixels and feedhorns for the 27/39 GHz multichroic array for AdvACT, which will target the synchrotron radiation that dominates at these frequencies. To gain 35% in mapping speed in the 39 GHz band where the foreground signals are faintest, the pixel number was increased through reducing the pixel diameter to $$1.08lambda $$1.08λ at the lowest frequency, which represents a 22% decrease in size compared to our previously most tightly packed pixels.