Cosmology Large Angular Scale Surveyor (CLASS): pointing stability and beam measurements at 90, 150, and 220 GHz

Cosmology Large Angular Scale Surveyor (CLASS): pointing stability and beam measurements at 90, 150, and 220 GHz
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宇宙学大角尺度测量仪 (CLASS):90、150 和 220 GHz 的指向稳定性和波束测量

DOI:
10.1117/12.2630649
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发表时间:
2022
期刊:
and Far-Infrared Detectors and Instrumentation for Astronomy XI
影响因子:
--
通讯作者:
Cleary, Joseph
Cleary, Joseph
中科院分区:
--
文献类型:
--
作者:
Datta, Rahul;Brewer, Michael K.;Denes Couto, Jullianna D.;Eimer, Joseph R.;Li, Yunyang;Xu, Zhilei;Appel, John W.;Bustos, Ricardo;Chuss, David;Cleary, Joseph

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宇宙学大角尺度勘测者 (CLASS) 望远镜阵列以 40、90、150 和 220 GHz 附近的频段为中心,对智利阿塔卡马沙漠 75% 的天空进行勘测。 CLASS 测量最大角尺度 (θ ≳ 1 ° ) CMB 偏振,目的是限制张量与标量比 r、测量再电离光学深度 τ 至接近宇宙方差极限等。 CLASS Q波段(40 GHz)、W波段(90 GHz)和二向色高频(150/220 GHz)望远镜分别自2016年6月、2018年5月和2019年9月开始进行观测。 40 GHz 仪器的空中光学特性已发布。在这里,我们展示了 90、150 和 220 GHz 光束的初步空中测量,以及 90 和 150/220 GHz 望远镜的指向稳定性。从木星专门观测中测得的平均 90、150 和 220 GHz 波束的半高全宽 (FWHM) 分别为 0.615±0.019°、0.378±0.005° 和 0.266±0.008°。望远镜指向变化在光束半高宽的百分之几以内。
The Cosmology Large Angular Scale Surveyor (CLASS) telescope array surveys 75% of the sky from the Atacama desert in Chile at frequency bands centered near 40, 90, 150, and 220 GHz. CLASS measures the largest-angular scale (θ ≳ 1 ◦ ) CMB polarization with the aim of constraining the tensor-to-scalar ratio, r, measuring the optical depth to reionization, τ , to near the cosmic variance limit, and more. The CLASS Q-band (40 GHz), W-band (90 GHz), and dichroic high frequency (150/220 GHz) telescopes have been observing since June 2016, May 2018, and September 2019, respectively. On-sky optical characterization of the 40 GHz instrument has been published. Here, we present preliminary on-sky measurements of the beams at 90, 150, and 220 GHz, and pointing stability of the 90 and 150/220 GHz telescopes. The average 90, 150, and 220 GHz beams measured from dedicated observations of Jupiter have full width at half maximum (FWHM) of 0.615±0.019◦ , 0.378±0.005◦ , and 0.266 ± 0.008◦ , respectively. Telescope pointing variations are within a few % of the beam FWHM.
用于 CLASS 望远镜的可变延迟偏振调制器
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发表时间: 2018
期刊: and Far-Infrared Detectors and Instrumentation for Astronomy IX
影响因子: --
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发表时间: 2012
期刊: Applied optics
影响因子: 1.9
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期刊: SPIE Proceedings
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