Design and performance of wide-band corrugated walls for the BICEP Array detector modules at 30/40 GHz
Design and performance of wide-band corrugated walls for the BICEP Array detector modules at 30/40 GHz
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30/40 GHz BICEP 阵列探测器模块宽带波纹壁的设计和性能
DOI：
10.1117/12.2312942
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Halpern, Mark
中科院分区：
文献类型：
--
作者：
Soliman, Ahmed;Benton, Steve J.;Bischoff, Colin A.;Bock, James J.;Bullock, Eric;Dvorkin, Cora;Filippini, Jeff P.;Fliescher, Stefan;Grayson, James A.;Halpern, Mark
BICEP阵列是一个度尺度的宇宙微波背景（CMB）实验，将搜索原始B模式偏振，同时限制银河系前景。BICEP阵列将由四个接收器组成，覆盖30/40、95、150和220/270 GHz的宽频率范围。第一个低频接收器将绘制30和40 GHz的同步辐射图，并将于2019年底部署到南极。在本文中，我们给出了BICEP阵列科学和仪器的概述，重点是探测器模块。我们在模块的金属框架中设计了波纹，以抑制与天线耦合检测器的不必要的相互作用，否则会使边缘像素的光束变形。这种设计减少了由于偏振光束对之间的光束转向和形状失配而引起的残余光束系统和温度-偏振泄漏。我们报告的单和宽带波纹设计，以尽量减少这些影响的模拟性能。我们的优化设计将由金属框架引起的波束微分椭圆率在57%带宽（25至45 GHz）上减小到约7%，这接近于由于裸天线本身没有金属框架的水平。初步实验室测量也提出。
BICEP Array is a degree-scale Cosmic Microwave Background (CMB) experiment that will search for primordial B-mode polarization while constraining Galactic foregrounds. BICEP Array will be comprised of four receivers to cover a broad frequency range with channels at 30/40, 95, 150 and 220/270 GHz. The first low-frequency receiver will map synchrotron emission at 30 and 40 GHz and will deploy to the South Pole at the end of 2019. In this paper, we give an overview of the BICEP Array science and instrument, with a focus on the detector module. We designed corrugations in the metal frame of the module to suppress unwanted interactions with the antenna-coupled detectors that would otherwise deform the beams of edge pixels. This design reduces the residual beam systematics and temperature-to-polarization leakage due to beam steering and shape mismatch between polarized beam pairs. We report on the simulated performance of single- and wide-band corrugations designed to minimize these effects. Our optimized design alleviates beam differential ellipticity caused by the metal frame to about 7% over 57% bandwidth (25 to 45 GHz), which is close to the level due the bare antenna itself without a metal frame. Initial laboratory measurements are also presented.
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DOI：
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发表时间：
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期刊：
SPIE
影响因子：
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作者：
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发表时间：
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期刊：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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影响因子：
8.6
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DOI：
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发表时间：
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