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The Cosmology Large Angular Scale Surveyor (CLASS): In search of the energy scale of inflation.

机译：宇宙学大角度测量器（CLASS）：寻找通货膨胀的能量尺度。

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摘要

The hypothesis that the early universe underwent a period of accelerating expansion, called inflation, has become an essential mechanism for explaining the flatness and homogeneity of the universe and explaining the fluctuations found in the cosmic microwave background (CMB). Inflation predicts the existence of primordial gravitational waves that would have produced a unique polarization pattern on the CMB. Measurement of the amplitude of these gravitational waves can be used to infer the energy scale of the potential driving the expansion. Detection of this signal would be a dramatic confirmation of the inflation paradigm and significantly tighten constraints on inflationary models.;The Cosmology Large Angular Scale Surveyor (CLASS) is a new ground-based instrument designed to search for the inflationary B-mode signal from the Atacama Desert in northern Chile (elevation ~ 5200 m). The CLASS instrument will observe over 60% of the sky to target the large scale polarization signal (> 10 deg), and consist of four separate telescopes: one observing at 40 GHz, two observing at 90 GHz and one observing at 150 GHz. The detectors for each band will be background limited antenna-coupled transition edge sensor bolometers.;A variable-delay polarization modulator (VPM) will be placed as the first optical element in each of the telescopes. The front-end polarization modulator will mitigate many systematic effects and provide a powerful means of distinguishing the instrument response from the input signal.;This dissertation contains an overview of the CLASS instrument. Specific emphasis is placed on the connection between the science goals and the instrument architecture. A description of the optical design of the 40 GHz telescope is given, and the application of the VPM technology to the CLASS instrument is described. We end with an overview of the detectors.
机译：早期宇宙经历了一个加速膨胀期（称为膨胀）的假说，已经成为解释宇宙的平坦性和同质性并解释在宇宙微波背景（CMB）中发现的波动的基本机制。通货膨胀预示了原始引力波的存在，该原始引力波会在CMB上产生独特的极化模式。这些引力波的振幅的测量可用于推断驱动膨胀的电势的能级。检测到该信号将极大地确认通货膨胀范式，并显着加强对通货膨胀模型的约束。宇宙学大角尺测量仪（CLASS）是一种新型的地面仪器，旨在从航模中搜索通货膨胀B模式信号。智利北部的阿塔卡马沙漠（海拔〜5200 m）。 CLASS仪器将观测超过60％的天空以对准大型偏振信号（> 10度），并由四台独立的望远镜组成：一台在40 GHz时观测，两台在90 GHz时观测和一台在150 GHz时观测。每个频段的探测器将是背景受限的天线耦合过渡边缘传感器辐射热计。可变延迟偏振调制器（VPM）将作为每个望远镜中的第一个光学元件放置。前端偏振调制器将减轻许多系统影响，并提供一种区分仪器响应与输入信号的有力手段。;本论文概述了CLASS仪器。特别强调科学目标与仪器架构之间的联系。给出了40 GHz望远镜的光学设计的描述，并介绍了VPM技术在CLASS仪器上的应用。最后，我们对检测器进行了概述。

著录项

  • 作者

    Eimer, Joseph R.;

  • 作者单位

    The Johns Hopkins University.;

  • 授予单位 The Johns Hopkins University.;
  • 学科 Physics Astronomy and Astrophysics.;Physics Astrophysics.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 184 p.
  • 总页数 184
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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