The First Multichroic Polarimeter Array on the Atacama Cosmology Telescope: Characterization and Performance
The First Multichroic Polarimeter Array on the Atacama Cosmology Telescope: Characterization and Performance
复制标题
阿塔卡马宇宙学望远镜上的第一个多色旋光仪阵列：特征和性能
DOI：
10.1007/s10909-016-1573-1
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发表时间：
2016
影响因子：
2
通讯作者：
E. Vavagiakis
中科院分区：
文献类型：
--
作者：
S. Ho;C. Pappas;J. Austermann;J. Beall;D. Becker;Steve K. Choi;R. Datta;S. Duff;P. Gallardo;E. Grace;M. Hasselfield;S. Henderson;G. Hilton;J. Hubmayr;B. Koopman;J. Lanen;Dale Li;J. McMahon;F. Nati;M. Niemack;P. Niraula;M. Salatino;A. Schillaci;B. Schmitt;S. Simon;S. Staggs;J. Stevens;J. Ward;Edward J. Wollack;E. Vavagiakis
阿塔卡马宇宙学望远镜偏振计（ACTPol）是6米阿塔卡马宇宙学望远镜（ACT）的偏振敏感接收器，用于测量宇宙微波背景（CMB）中的小角尺度偏振各向异性。整个焦平面由三个探测器阵列组成，总共包含超过3000个过渡边缘传感器（TES探测器）。在146 GHz观测的前两个探测器阵列分别于2013年和2014年部署。第三个也是最后一个阵列由对90和146 GHz敏感的多色像素组成，并于2015年2月首次亮相。在NIST制造，这个二向色阵列由255个像素组成，共有1020个偏振敏感测辐射热计，并与宽带硅喇叭单片阵列耦合到望远镜。使用时分SQUID多路复用读出检测器，并通过稀释冰箱在110 mK下冷却。我们提出了一个概述的组装和表征的多色阵列在实验室中，在智利的初始检测器的性能。该探测器阵列具有TES探测器的电产额为85%，总阵列灵敏度小于10 $$\sqrt{\text {s}}$$s，探测器的时间常数和饱和功率适合ACT CMB观测。
The Atacama Cosmology Telescope Polarimeter (ACTPol) is a polarization sensitive receiver for the 6-m Atacama Cosmology Telescope (ACT) and measures the small angular scale polarization anisotropies in the cosmic microwave background (CMB). The full focal plane is composed of three detector arrays, containing over 3000 transition edge sensors (TES detectors) in total. The first two detector arrays, observing at 146 GHz, were deployed in 2013 and 2014, respectively. The third and final array is composed of multichroic pixels sensitive to both 90 and 146 GHz and saw first light in February 2015. Fabricated at NIST, this dichroic array consists of 255 pixels, with a total of 1020 polarization sensitive bolometers and is coupled to the telescope with a monolithic array of broad-band silicon feedhorns. The detectors are read out using time-division SQUID multiplexing and cooled by a dilution refrigerator at 110 mK. We present an overview of the assembly and characterization of this multichroic array in the lab, and the initial detector performance in Chile. The detector array has a TES detector electrical yield of 85 %, a total array sensitivity of less than 10 $$\upmu $$μK$$\sqrt{\text {s}}$$s, and detector time constants and saturation powers suitable for ACT CMB observations.