The Cosmology Large Angular Scale Surveyor
The Cosmology Large Angular Scale Surveyor
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DOI：
10.1117/12.2233125
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发表时间：
2016-07
期刊：
影响因子：
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通讯作者：
K. Harrington;T. Marriage;Aamir Ali;J. Appel;C. Bennett;F. Boone;M. Brewer;M. Chan;D. Chuss;F. Colazo;S. Dahal;K. Denis;R. Dünner;J. Eimer;T. Essinger-Hileman;P. Fluxà;M. Halpern;G. Hilton;G. Hinshaw;J. Hubmayr;J. Iuliano;J. Karakla;J. McMahon;N. Miller;S. Moseley;G. Palma;L. Parker;M. Petroff;Basti'an Pradenas;K. Rostem;Marco Sagliocca;Deniz A. N. Valle;D. Watts;Edward J. Wollack;Zhilei Xu;L. Zeng
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文献类型：
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作者：
K. Harrington;T. Marriage;Aamir Ali;J. Appel;C. Bennett;F. Boone;M. Brewer;M. Chan;D. Chuss;F. Colazo;S. Dahal;K. Denis;R. Dünner;J. Eimer;T. Essinger-Hileman;P. Fluxà;M. Halpern;G. Hilton;G. Hinshaw;J. Hubmayr;J. Iuliano;J. Karakla;J. McMahon;N. Miller;S. Moseley;G. Palma;L. Parker;M. Petroff;Basti'an Pradenas;K. Rostem;Marco Sagliocca;Deniz A. N. Valle;D. Watts;Edward J. Wollack;Zhilei Xu;L. Zeng
宇宙学大角尺度探测器（CLASS）是一个四望远镜阵列，旨在通过测量最大角尺度上的偏振宇宙微波背景（CMB）来表征从电离到再电离的遗迹原始引力波和光学深度。四个CLASS望远镜的频率，一个在38 GHz，两个在93 GHz，一个在145/217 GHz的分色系统，被选择为避免高大气发射的光谱区域，并跨越最小的极化银河前景：同步辐射在较低的频率和尘埃辐射在较高的频率。低噪声过渡边缘传感器探测器和快速前端偏振调制器提供了高灵敏度、稳定性和系统控制的独特组合。CLASS站点位于智利阿塔卡马沙漠5200米处，允许每天绘制高达70%的天空，并能够在最大角度尺度上表征CMB偏振。利用这种宽频率范围、大天空覆盖范围、系统控制和高灵敏度的组合，CLASS将观察CMB E和B模式功率谱的再电离和复合峰。CLASS将对再电离的光学深度进行宇宙方差限制测量，并将测量张量与标量比r或将其上限降低到0.01（95% C.L.）。
The Cosmology Large Angular Scale Surveyor (CLASS) is a four telescope array designed to characterize relic primordial gravitational waves from in ation and the optical depth to reionization through a measurement of the polarized cosmic microwave background (CMB) on the largest angular scales. The frequencies of the four CLASS telescopes, one at 38 GHz, two at 93 GHz, and one dichroic system at 145/217 GHz, are chosen to avoid spectral regions of high atmospheric emission and span the minimum of the polarized Galactic foregrounds: synchrotron emission at lower frequencies and dust emission at higher frequencies. Low-noise transition edge sensor detectors and a rapid front-end polarization modulator provide a unique combination of high sensitivity, stability, and control of systematics. The CLASS site, at 5200 m in the Chilean Atacama desert, allows for daily mapping of up to 70% of the sky and enables the characterization of CMB polarization at the largest angular scales. Using this combination of a broad frequency range, large sky coverage, control over systematics, and high sensitivity, CLASS will observe the reionization and recombination peaks of the CMB E- and B-mode power spectra. CLASS will make a cosmic variance limited measurement of the optical depth to reionization and will measure or place upper limits on the tensor-to-scalar ratio, r, down to a level of 0.01 (95% C.L.).