Li Hong, Li Si-Yu, Liu Yang, Li Yong-Ping, Cai Yifu, Li Mingzhe, Zhao Gong-Bo, Liu Cong-Zhan, Li Zheng-Wei, Xu He, Wu Di, Zhang Yong-Jie, Fan Zu-Hui, Yao Yong-Qiang, Kuo Chao-Lin, Lu Fang-Jun, Zhang Xinmin
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
Theoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
Natl Sci Rev. 2019 Jan;6(1):145-154. doi: 10.1093/nsr/nwy019. Epub 2018 Feb 5.
In this paper, we will give a general introduction to the Ali CMB Polarization Telescope (AliCPT) project, which is a Sino-US joint project led by the Institute of High Energy Physics and involves many different institutes in China. It is the first ground-based Cosmic Microwave Background (CMB) polarization experiment in China and an integral part of China's Gravitational-wave Program. The main scientific goal of the AliCPT project is to probe the primordial gravitational waves (PGWs) originating from the very early Universe. The AliCPT project includes two stages. The first stage, referred to as AliCPT-1, is to build a telescope in the Ali region of Tibet at an altitude of 5250 meters. Once completed, it will be the highest ground-based CMB observatory in the world and will open a new window for probing PGWs in the northern hemisphere. The AliCPT-1 telescope is designed to have about 7000 transition-edge sensor detectors at 95 GHz and 150 GHz. The second stage is to have a more sensitive telescope (AliCPT-2) with more than 20 000 detectors. Our simulations show that AliCPT will improve the current constraint on the tensor-to-scalar ratio by one order of magnitude with three years' observation. Besides the PGWs, AliCPT will also enable a precise measurement of the CMB rotation angle and provide a precise test of the CPT symmetry. We show that three years' observation will improve the current limit by two orders of magnitude.
在本文中，我们将对阿里宇宙微波背景偏振望远镜（AliCPT）项目作一个总体介绍。该项目是一个由中国高能物理研究所牵头的中美合作项目，涉及中国许多不同的科研机构。它是中国首个地基宇宙微波背景（CMB）偏振实验，也是中国引力波计划的一个组成部分。AliCPT项目的主要科学目标是探测源自极早期宇宙的原初引力波（PGW）。AliCPT项目包括两个阶段。第一阶段，称为AliCPT-1，是在西藏阿里地区海拔5,250米处建造一台望远镜。一旦建成，它将成为世界上最高的地基CMB观测站，并将为在北半球探测PGW打开一扇新窗口。AliCPT-1望远镜设计在95吉赫和150吉赫频段配备约7,000个过渡边传感器探测器。第二阶段是建造一台更灵敏的望远镜（AliCPT-2），配备超过20,000个探测器。我们的模拟结果表明，AliCPT通过三年观测将把当前对张量与标量比的限制提高一个数量级。除了探测原初引力波外，AliCPT还将能够精确测量CMB旋转角，并对CPT对称性进行精确检验。我们表明，三年观测将把当前的限制提高两个数量级。
