An Instrument for Investigating the Large Angular Scale Polarization of the Cosmic Microwave Background

An Instrument for Investigating the Large Angular Scale Polarization of the Cosmic Microwave Background
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研究宇宙微波背景大角尺度偏振的仪器

DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
P. Timbie
P. Timbie
中科院分区：
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文献类型：
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作者：
B. Keating;C. O’Dell;J. Gundersen;L. Piccirillo;N. Stebor;P. Timbie

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我们描述了微波偏振计的设计和性能，该偏振计用于在跨越 26-36 GHz 的三个微波频带内精确测量偏振天体物理辐射。该仪器在相关旋光计配置中使用冷却 HEMT 放大器，以实现高灵敏度和长期稳定性。该仪器表现出长期稳定性，并针对 2.7 K 宇宙微波背景辐射的大角尺度偏振产生了迄今为止最具限制性的上限。
We describe the design and performance of a microwave polarimeter used to make precision measurements of polarized astrophysical radiation in three microwave frequency bands spanning 26-36 GHz. The instrument uses cooled HEMT amplifiers in a correlation polarimeter configuration to achieve high sensitivity and long-term stability. The instrument demonstrates long-term stability and has produced the most restrictive upper limits to date on the large angular scale polarization of the 2.7 K cosmic microwave background radiation.