Overview of the medium and high frequency telescopes of the LiteBIRD space mission
Overview of the medium and high frequency telescopes of the LiteBIRD space mission
复制标题
LiteBIRD太空任务中高频望远镜概述
DOI：
10.1117/12.2562243
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Montier Ludovic;et al.
LiteBIRD是由日本宇宙航空研究开发机构领导的一项战略大型任务，旨在通过测量宇宙微波背景(CMB)的偏振印记来搜索宇宙膨胀阶段产生的原始引力波的存在。这些测量需要前所未有的灵敏度，将在全天空、大角度尺度和从34 GHz到448 GHz的15个频段上进行。LiteBIRD仪器由三个望远镜组成，即低、中、高频望远镜(分别为LFT、MFT和HFT)。本文介绍了欧洲负责的中频望远镜(89{224 GHz)和高频望远镜(166{448 GHz)的设计概况，它们是两个冷却到5K的低温折射望远镜，其中包括一个连续旋转的半波片作为第一个光学元件，两个高密度聚乙烯(HDPE)透镜和3000多个冷却到100MK的跃迁边缘传感器(TES)探测器。我们概述了LiteBIRD的概念设计和为了实现LiteBIRD的科学目标而必须面对的剩余具体挑战。
LiteBIRD is a JAXA-led Strategic Large-Class mission designed to search for the existence of the primordial gravitational waves produced during the inflationary phase of the Universe, through the measurements of their imprint onto the polarization of the cosmic microwave background (CMB). These measurements, requiring unprecedented sensitivity, will be performed over the full sky, at large angular scales, and over 15 frequency bands from 34 GHz to 448 GHz. The LiteBIRD instruments consist of three telescopes, namely the Low-, Medium-and High-Frequency Telescope (respectively LFT, MFT and HFT). We present in this paper an overview of the design of the Medium-Frequency Telescope (89{224 GHz) and the High-Frequency Telescope (166{448 GHz), the so-called MHFT, under European responsibility, which are two cryogenic refractive telescopes cooled down to 5 K. They include a continuous rotating half-wave plate as the first optical element, two high-density polyethylene (HDPE) lenses and more than three thousand transition-edge sensor (TES) detectors cooled to 100 mK. We provide an overview of the concept design and the remaining specific challenges that we have to face in order to achieve the scientific goals of LiteBIRD.