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Performance and on-sky optical characterization of the SPTpol instrument

机译:SPTpol仪器的性能和空中光学表征

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摘要

In January 2012, the 10m South Pole Telescope (SPT) was equipped with a polarization-sensitive camera, SPTpol, in order to measure the polarization anisotropy of the cosmic microwave background (CMB). Measurements of the polarization of the CMB at small angular scales (~several arcminutes) can detect the gravitational lensing of the CMB by large scale structure and constrain the sum of the neutrino masses. At large angular scales (~few degrees) CMB measurements can constrain the energy scale of Inflation. SPTpol is a two-color mm-wave camera that consists of 180 polarimeters at 90 GHz and 588 polarimeters at 150 GHz, with each polarimeter consisting of a dual transition edge sensor (TES) bolometers. The full complement of 150 GHz detectors consists of 7 arrays of 84 ortho-mode transducers (OMTs) that are stripline coupled to two TES detectors per OMT, developed by the TRUCE collaboration and fabricated at NIST. Each 90 GHz pixel consists of two antenna-coupled absorbers coupled to two TES detectors, developed with Argonne National Labs. The 1536 total detectors are read out with digital frequency-domain multiplexing (DfMUX). The SPTpol deployment represents the first on-sky tests of both of these detector technologies, and is one of the first deployed instruments using DfMUX readout technology. We present the details of the design, commissioning, deployment, on-sky optical characterization and detector performance of the complete SPTpol focal plane.
机译:2012年1月,10 m南极望远镜(SPT)配备了偏振敏感相机SPTpol,以测量宇宙微波背景(CMB)的偏振各向异性。在小角度范围内(约几弧分)测量CMB的极化可以通过大型结构检测CMB的引力透镜,并限制中微子质量的总和。在大角度范围内(约几度),CMB测量值可能会限制通货膨胀的能量范围。 SPTpol是一种两色毫米波相机,由90 GHz的180偏振仪和150 GHz的588偏振仪组成,每个偏振仪均由双过渡边缘传感器(TES)辐射热计组成。 150 GHz探测器的完整补充包括由84个正交模式传感器(OMT)组成的7个阵列,带状线与每个OMT的两个TES检测器耦合,由TRUCE合作开发并由NIST制造。每个90 GHz像素由两个天线耦合的吸收器组成,该吸收器与两个由Argonne National Labs开发的TES检测器相连。通过数字频域多路复用(DfMUX)读出总共1536个检测器。 SPTpol部署代表了这两种检测器技术的首次空中测试,并且是使用DfMUX读数技术部署的首批仪器之一。我们介绍了完整SPTpol焦平面的设计,调试,部署,空中光学表征和探测器性能的详细信息。

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