Optical designing of LiteBIRD
Optical designing of LiteBIRD
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LiteBIRD的光学设计
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
T. Fujii
中科院分区：
文献类型：
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作者：
H. Sugai;S. Kashima;K. Kimura;T. Matsumura;M. Inoue;Makoto Ito;T. Nishibori;Y. Sekimoto;H. Ishino;Y. Sakurai;H. Imada;T. Fujii
LiteBIRD的目标是探测宇宙微波背景(CMB)上原始引力波的足迹，这种形式的偏振模式称为B模式。为了将CMB从银河系发射中分离出来，我们的测量范围是35 GHz到450 GHz。LiteBIRD光学系统由两个望远镜组成：一个是用于较低频率的交叉Drago型望远镜，它提供了紧凑的配置和宽广的视场；另一个是用于较高频率的折射镜型望远镜。整个光学系统被冷却到5K左右，以最大限度地减少热发射。我们采用了两种方法进行设计计算和实验验证，特别是对低频望远镜。
LiteBIRD aims to detect the footprint of the primordial gravitational wave on the Cosmic Microwave Background (CMB) in a form of polarization pattern called B mode. In order to separate CMB from the Galactic emission, our measurements cover 35 GHz to 450 GHz. The LiteBIRD optics consists of two telescopes: a crossed Dragone type for lower frequencies, which provides a compact configuration with a wide field of view, and a refractor type for higher frequencies. The whole optical system is cooled down to around 5 K to minimize the thermal emission. We use two kinds of approaches of designing calculations as well as the experimental confirmation particularly for the lower frequency telescope.