SPTpol: an instrument for CMB polarization measurements with the South Pole Telescope
SPTpol: an instrument for CMB polarization measurements with the South Pole Telescope
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DOI：
10.1117/12.927286
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
J. Austermann;K. Aird;J. Beall;D. Becker;A. Bender;B. Benson;L. Bleem;J. Britton;J. Carlstrom;J. Carlstrom;C. Chang;C. Chang;H. Chiang;H. Cho;T. Crawford;A. Crites;A. Datesman;T. Haan;M. Dobbs;E. George;N. Halverson;N. Harrington;J. Henning;G. Hilton;G. Holder;W. Holzapfel;S. Hoover;Norden E. Huang;J. Hubmayr;K. Irwin;R. Keisler;J. Kennedy;L. Knox;Adrian T. Lee;E. Leitch;Dale Li;M. Lueker;D. Marrone;J. McMahon;J. Mehl;S. Meyer;T. Montroy;T. Natoli;J. Nibarger;M. Niemack;V. Novosad;S. Padin;C. Pryke;C. Reichardt;J. Ruhl;B. Saliwanchik;J. Sayre;K. Schaffer;E. Shirokoff;A. Stark;K. Story;K. Vanderlinde;J. Vieira;Gensheng Wang;R. Williamson;V. Yefremenko;K. W. Yoon;O. Zahn
中科院分区：
文献类型：
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作者：
J. Austermann;K. Aird;J. Beall;D. Becker;A. Bender;B. Benson;L. Bleem;J. Britton;J. Carlstrom;J. Carlstrom;C. Chang;C. Chang;H. Chiang;H. Cho;T. Crawford;A. Crites;A. Datesman;T. Haan;M. Dobbs;E. George;N. Halverson;N. Harrington;J. Henning;G. Hilton;G. Holder;W. Holzapfel;S. Hoover;Norden E. Huang;J. Hubmayr;K. Irwin;R. Keisler;J. Kennedy;L. Knox;Adrian T. Lee;E. Leitch;Dale Li;M. Lueker;D. Marrone;J. McMahon;J. Mehl;S. Meyer;T. Montroy;T. Natoli;J. Nibarger;M. Niemack;V. Novosad;S. Padin;C. Pryke;C. Reichardt;J. Ruhl;B. Saliwanchik;J. Sayre;K. Schaffer;E. Shirokoff;A. Stark;K. Story;K. Vanderlinde;J. Vieira;Gensheng Wang;R. Williamson;V. Yefremenko;K. W. Yoon;O. Zahn
SPTpol是一种双频偏振敏感相机，于2012年1月部署在10米长的南极望远镜上。SPTpol将在一角分到几度的角度尺度上测量宇宙微波背景(CMB)的偏振各向异性。SPTpol的偏振灵敏度将使人们能够通过大尺度结构探测到CMB的引力透镜，从而探测到CMB的“B模”偏振，并能够探测到或改进了由于初始重力波而产生的原始信号的上限。这两个测量可以用来限制中微子质量的总和和粒子的能量尺度。这些科学目标可以通过SPTpol相机的偏振敏感度和对系统的仔细控制来实现。SPTpol相机由768个像素组成，每个像素包含两个耦合到正交偏振的过渡边缘传感器(TES)测辐射热计，以及总共1536个测辐射热计。像素对以90 GHz和150 GHz为中心的两个频段之一的光敏感，90 GHz时为180像素，150 GHz时为588像素。SPTpol设计具有几个旨在控制极化系统的功能，包括：低交叉极化的单模馈电喇叭、与不同大气信号匹配良好的测辐射热计对、基于SPT远旁瓣测量的改进接地屏蔽设计，以及减少温度对偏振泄漏的小波束。我们对SPTpol仪器的设计、项目现状和科学预测进行了概述。
SPTpol is a dual-frequency polarization-sensitive camera that was deployed on the 10-meter South Pole Telescope in January 2012. SPTpol will measure the polarization anisotropy of the cosmic microwave background (CMB) on angular scales spanning an arcminute to several degrees. The polarization sensitivity of SPTpol will enable a detection of the CMB “B-mode” polarization from the detection of the gravitational lensing of the CMB by large scale structure, and a detection or improved upper limit on a primordial signal due to inationary gravity waves. The two measurements can be used to constrain the sum of the neutrino masses and the energy scale of ination. These science goals can be achieved through the polarization sensitivity of the SPTpol camera and careful control of systematics. The SPTpol camera consists of 768 pixels, each containing two transition-edge sensor (TES) bolometers coupled to orthogonal polarizations, and a total of 1536 bolometers. The pixels are sensitive to light in one of two frequency bands centered at 90 and 150 GHz, with 180 pixels at 90 GHz and 588 pixels at 150 GHz. The SPTpol design has several features designed to control polarization systematics, including: singlemoded feedhorns with low cross-polarization, bolometer pairs well-matched to dfference atmospheric signals, an improved ground shield design based on far-sidelobe measurements of the SPT, and a small beam to reduce temperature to polarization leakage. We present an overview of the SPTpol instrument design, project status, and science projections.