A Polarization Modulator Unit for the Mid- and High-Frequency Telescopes of the LiteBIRD mission

被引:5
|
作者
Columbro, Fabio [1 ,2 ]
de Bernardis, Paolo [1 ,2 ]
Lamagna, Luca [1 ,2 ]
Masi, Silvia [1 ,2 ]
Paiella, Alessandro [1 ,2 ]
Piacentini, Francesco [1 ,2 ]
Pisano, Giampaolo [1 ,3 ]
机构
[1] Sapienza Univ Roma, Dipartimento Fis, Ple A Moro 5, I-00185 Rome, Italy
[2] Ist Nazl Fis Nucl, Sez Roma1, Ple A Moro 5, I-00185 Rome, Italy
[3] Cardiff Univ, Sch Phys & Astron, Queens Bldg, Cardiff CF24 3AA, Wales
基金
瑞典研究理事会;
关键词
Cosmology; polarimeter; cryogenic; HWP; HALF-WAVE PLATE; MAGNETS;
D O I
10.1117/12.2577818
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The LiteBIRD mission is a JAXA strategic L-class mission for all sky CMB surveys which will be launched in the 2020s. The main target of the mission is the detection of primordial gravitational waves with a sensitivity of the tensor-to-scalar ratio delta r < 0.001. The polarization modulator unit (PMU) represents a critical and powerful component to suppress 1/f noise contribution and mitigate systematic uncertainties induced by detector gain drift, both for the high-frequency telescope (HFT) and for the mid-frequency telescope (MFT). Each PMU is based on a continuously-rotating transmissive half-wave plate (HWP) held by a superconducting magnetic bearing in a 5K environment. In this proceeding we will present the design and expected performance of the LiteBIRD PMUs and testing performed on every PMU subsystem with a room-temperature rotating disk used as a stand-in for the cryogenic HWP rotor.
引用
收藏
页数:16
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