论文标题
宇宙学大尺度测量师（类）：指向稳定性和光束测量在90、150和220 GHz
Cosmology Large Angular Scale Surveyor (CLASS): Pointing Stability and Beam Measurements at 90, 150, and 220 GHz
论文作者
论文摘要
宇宙学大尺度测量师（类）望远镜阵列从智利的Atacama沙漠中调查75％的天空，频率带相比40、90、150和220 GHz。班级测量最大的角度CMB极化，目的是限制张量与量表的比率，测量光学深度到将电离的电源恢复到接近宇宙方差极限等等。自2016年6月，2018年5月和2019年9月以来，已经观察到Q频段（40 GHz），W频段（90 GHz）和二分性高频（150/220 GHz）望远镜。 40 GHz仪器的天空光学表征已发布。在这里，我们介绍了90、150和220 GHz的光束的初步测量，并指向90和150/220 GHz望远镜的稳定性。根据木星的专用观测值测得的平均90、150和220 GHz光束的最大宽度（FWHM）为0.615 +/- 0.019度，0.378 +/- 0.378 +/- 0.005度和0.266 +/- 0.008度。望远镜指向变化在光束FWHM的几％之内。
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 CMB polarization with the aim of constraining the tensor-to-scalar ratio, measuring the optical depth to reionization 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 deg, 0.378+/-0.005 deg, and 0.266+/-0.008 deg, respectively. Telescope pointing variations are within a few percent of the beam FWHM.
