GroundBIRD：使用MKID阵列的CMB极化实验
GroundBIRD : A CMB polarization experiment with MKID arrays
摘要：
GroundBird是一个精确观测宇宙微波背景偏振的地面实验。为了在大角度范围内实现高灵敏度，我们在实验中采用了三个特点：快速旋转扫描，微波动力学电感探测器（MKID）和冷光学。旋转扫描策略具有抑制$1/f$噪声的优点。它还提供了40%的大天空覆盖范围，这与$l \sim 6$的大角度尺度相对应。这使得我们能够通过使用低$l$ B模式谱来约束张量标量比。焦平面由7个MKID阵列组成，用于两个目标频率，145 GHz和220 GHz频段。总共有161个像素，其中138个用于144 GHz，23个用于220 GHz。该阵列目前正在开发中，原型将很快在望远镜中进行评估。GroundBird望远镜将在泰德天文台观测CMB。这架望远镜从日本搬到了特内里费岛，目前正在接受测试。我们介绍了GroundBird实验的现状和计划。
英文摘要：
GroundBIRD is a ground-based experiment for the precise observation of the polarization of the cosmic microwave background (CMB). To achieve high sensitivity at large angular scale, we adopt three features in this experiment: fast rotation scanning, microwave kinetic inductance detector (MKID) and cold optics. The rotation scanning strategy has the advantage to suppress $1/f$ noise. It also provides a large sky coverage of 40\%, which corresponds to the large angular scales of $l \sim 6$. This allows us to constrain the tensor-to-scalar ratio by using low $l$ B-mode spectrum. The focal plane consists of 7 MKID arrays for two target frequencies, 145 GHz and 220 GHz band. There are 161 pixels in total, of which 138 are for 144 GHz and 23 are for 220 GHz. This array is currently under development and the prototype will soon be evaluated in telescope. The GroundBIRD telescope will observe the CMB at the Teide observatory. The telescope was moved from Japan to Tenerife and is now under test. We present the status and plan of the GroundBIRD experiment.
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