GroundBIRD: Observation of CMB Polarization with a Rapid Scanning and MKIDs
GroundBIRD: Observation of CMB Polarization with a Rapid Scanning and MKIDs
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GroundBIRD：通过快速扫描和 MKID 观测 CMB 偏振
DOI：
10.1007/s10909-018-2077-y
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发表时间：
2018
影响因子：
2
通讯作者：
Nagasaki T. et al.
中科院分区：
文献类型：
--
作者：
Kutsuma Hiroki;Hattori Makoto;Kiuchi Kenji;Mima Satoru;Nagasaki Taketo;Oguri Shugo;Suzuki Junya;Tajima Osamu;Nagasaki T. et al.
宇宙微波背景辐射（CMB）是大爆炸的余辉。宇宙微波背景辐射包含了关于宇宙早期的丰富信息。特别是，在大角度尺度上CMB偏振的奇宇称模式（B模式）将提供宇宙暴胀的证据。GroundBird实验的目的是从地面观察大角度尺度上的B模式。用于该实验的望远镜的最新特点之一是其快速旋转扫描技术。此外，望远镜使用冷光学和微波动力学电感探测器。我们已经开发了一个望远镜安装与三轴旋转机构（方位角，仰角，和bobbin），并测量在焦平面阶段在20 RPM的扫描旋转速率的振动。我们还进行了焦平面探测器的测试，这个安装。测试证实了与底座旋转相关的地磁的预期响应。我们还开发了磁屏蔽和3英寸晶圆上的探测器阵列的设计。2018年开始在加那利群岛的泰德天文台进行观测的准备工作正在顺利进行。
Cosmic microwave background (CMB) radiation is an afterglow from the Big Bang. CMB contains rich information about the early stage of the universe. In particular, odd-parity patterns (B-mode) in the CMB polarization on a large angular scale would provide an evidence of the cosmic inflation. The aim of the GroundBIRD experiment is to observe theB-mode on large angular scales from the ground. One of the most novel characteristics of the telescope used for this experiment is its rapid rotational scanning technique. In addition, the telescope uses cold optics and microwave kinetic inductance detectors. We have developed a telescope mount with a three-axis rotation mechanism (azimuth, elevation, and boresight) and measured the vibration at the focal plane stage at 20 RPM scan rotation rate. We also performed focal plane detector tests on this mount. The tests confirmed the expected response from the geomagnetism associated with the mount rotation. We have also developed a design for the magnetic shields and a detector array on a 3-in wafer. The preparations to begin the observations at the Teide Observatory in the Canary Islands in 2018 are proceeding smoothly.