Advancing Technologies for Measuring the Largest Angular Scale CMB

先进的最大角尺度 CMB 测量技术

• 批准号: 2109311
• 负责人: Charles Bennett
• 金额: $ 109.65万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2109311&HistoricalAwards=false
• 关键词: Advancing; Technologies; Measuring; Largest; Angular

Cosmology is the big-picture study of the universe. One of the most important means for research in this field is to make careful measurements of the very faint radiation known as the “cosmic microwave background.” This radiation is very faint. Also, there are other radiation signals from non-cosmological sources that must be distinguished. The technology and instrumentation to allow such experiments to make the needed measurements is a major challenge. Over the years progress has been made studying ever fainter aspects of this background radiation that are then used to test competing theoretical models. To enable such scientific progress, the underlying technologies must be improved further as will be undertaken in this project. The team will provide instrumentation training for the next generation of scientists and will leverage this project to enhance their public education efforts.This project seeks to develop technology for an enhanced polarimeter to study reionization and inflation cosmology on the Cosmology Large Angular Scale Surveyor (CLASS). CLASS is built to measure the Cosmic Microwave Background (CMB) polarization on angular scales greater than 10 degrees (corresponding to spherical harmonic multipole moments near 20). The survey looks to produce a high fidelity polarization map over 70% of the sky at frequencies near the Galactic foreground minimum. This project will develop enhanced larger format detector arrays and silicon optics that will improve CLASS sensitivity to ultimately allow better understanding of the early universe and fundamental physics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

宇宙学是对宇宙的宏观研究。这一领域最重要的研究手段之一是仔细测量被称为“宇宙微波背景”的非常微弱的辐射。这种辐射非常微弱。此外，还有来自非宇宙源的其他辐射信号必须加以区分。使这些实验能够进行所需测量的技术和仪器是一项重大挑战。多年来，对背景辐射的研究取得了进展，这些研究可以用来测试相互竞争的理论模型。为了实现这样的科学进步，必须进一步改进基础技术，这将在本项目中进行。该团队将为下一代科学家提供仪器培训，并将利用该项目加强他们的公共教育工作。该项目旨在开发一种增强型偏振计技术，用于研究宇宙大角尺度勘测器（CLASS）上的再电离和暴胀宇宙学。CLASS用于测量角尺度大于10度的宇宙微波背景（CMB）极化（对应于20附近的球谐多极矩）。这项调查希望在银河系前景最小值附近的频率上，绘制出覆盖70%天空的高保真偏振图。该项目将开发增强的大格式探测器阵列和硅光学器件，以提高CLASS的灵敏度，最终使人们更好地了解早期宇宙和基础物理。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Microwave Observations of Venus with CLASS

用 CLASS 进行金星微波观测

• DOI: 10.3847/psj/acee76
• 发表时间: 2023
• 期刊: The Planetary Science Journal
• 作者: Dahal, Sumit;Brewer, Michael K.;Akins, Alex B.;Appel, John W.;Bennett, Charles L.;Bustos, Ricardo;Cleary, Joseph;Couto, Jullianna D.;Datta, Rahul;Eimer, Joseph
• 通讯作者: Eimer, Joseph

Construction of a large diameter reflective half-wave plate modulator for millimeter wave applications

用于毫米波应用的大直径反射式半波片调制器的构造

• DOI: 10.1117/12.2630637
• 发表时间: 2022
• 期刊: and Far-Infrared Detectors and Instrumentation for Astronomy XI
• 作者: Eimer, Joseph R.;Brewer, Michael K.;Chuss, David T.;Karakla, John;Shi, Rui;Appel, John W.;Bennett, Charles L.;Cleary, Joseph;Dahal, Sumit;Datta, Rahul
• 通讯作者: Datta, Rahul

Cosmology Large Angular Scale Surveyor (CLASS): pointing stability and beam measurements at 90, 150, and 220 GHz

宇宙学大角尺度测量仪 (CLASS)：90、150 和 220 GHz 的指向稳定性和波束测量

• DOI: 10.1117/12.2630649
• 发表时间: 2022
• 期刊: and Far-Infrared Detectors and Instrumentation for Astronomy XI
• 作者: Datta, Rahul;Brewer, Michael K.;Denes Couto, Jullianna D.;Eimer, Joseph R.;Li, Yunyang;Xu, Zhilei;Appel, John W.;Bustos, Ricardo;Chuss, David;Cleary, Joseph
• 通讯作者: Cleary, Joseph

Long-timescale stability in CMB observations at multiple frequencies using front-end polarization modulation

使用前端偏振调制在多个频率下实现 CMB 观测的长时标稳定性

• DOI: 10.1117/12.2629723
• 发表时间: 2022
• 期刊: and Far-Infrared Detectors and Instrumentation for Astronomy XI
• 作者: Cleary, Joseph;Datta, Rahul;Appel, John;Bennet, Charles;Chuss, David;Denes Couto, Julliana;Dahal, Sumit;Espinoza, Francisco;Essinger-Hileman, Thomas;Harrington, Kathleen
• 通讯作者: Harrington, Kathleen

Calibration of Transition-edge Sensor (TES) Bolometer Arrays with Application to CLASS

过渡边缘传感器 (TES) 测辐射热计阵列的校准及其在 CLASS 中的应用

• DOI: 10.3847/1538-4365/ac8cf2
• 发表时间: 2022
• 期刊: The Astrophysical Journal Supplement Series
• 作者: Appel, John W.;Bennett, Charles L.;Brewer, Michael K.;Bustos, Ricardo;Chan, Manwei;Chuss, David T.;Cleary, Joseph;Couto, Jullianna D.;Dahal, Sumit;Datta, Rahul
• 通讯作者: Datta, Rahul