The Simons Observatory: Magnetic Sensitivity Measurements of Microwave SQUID Multiplexers

The Simons Observatory: Magnetic Sensitivity Measurements of Microwave SQUID Multiplexers
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西蒙斯天文台:微波 SQUID 多路复用器的磁灵敏度测量

DOI:
10.1109/tasc.2021.3069294
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发表时间:
2021
影响因子:
1.8
通讯作者:
Dicker, Simon
Dicker, Simon
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Vavagiakis, Eve M.;Ahmed, Zeeshan;Ali, Aamir;Arnold, Kam;Austermann, Jason;Bruno, Sarah Marie;Choi, Steve K.;Connors, Jake;Cothard, Nicholas;Dicker, Simon

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西蒙斯天文台(SO)将是一个宇宙微波背景(CMB)观测实验,由三个小口径望远镜和一个大口径望远镜组成,将在智利的阿塔卡马沙漠进行观测。总体而言,为了获得测量或约束大量宇宙量所需的灵敏度,将在27至280 GHz之间的六个光谱频段内部署约70,000个跃迁边缘传感器(TES)测辐射热计。每个通用焦平面模块(UFM)都包含一个直径150 mm的TES探测器阵列、喇叭或小透镜光学耦合、冷读出组件和磁屏蔽。因此将使用微波鱿鱼多路复用器(μMUX)读出,初始多路复用率为~1000;冷(100MK)读出组件封装在μ多路复用器读出模块中,该模块是UFM的一部分,也可以独立表征。100MK级TES测辐射热计阵列和微波SQUID对磁场非常敏感,它们的测量响应将随着它们被磁屏蔽的程度而变化。我们给出了测试微波SQUID多路复用器的磁拾取的测量结果,作为对西蒙斯天文台不同屏蔽配置的研究。我们讨论了这些测量如何激励UFM磁屏蔽的材料选择和设计。
The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope, which will observe from the Atacama Desert in Chile. In total, SO will field ~70,000 transition-edge sensor (TES) bolometers in six spectral bands centered between 27 and 280 GHz in order to achieve the sensitivity necessary to measure or constrain numerous cosmological quantities. The SO Universal Focal Plane Modules (UFMs) each contain a 150 mm diameter TES detector array, horn or lenslet optical coupling, cold readout components, and magnetic shielding. SO will use a microwave SQUID multiplexing (μMUX) readout at an initial multiplexing factor of ~1000; the cold (100 mK) readout components are packaged in a μMUX readout module, which is part of the UFM, and can also be characterized independently. The 100 mK stage TES bolometer arrays and microwave SQUIDs are sensitive to magnetic fields, and their measured response will vary with the degree to which they are magnetically shielded. We present measurements of the magnetic pickup of test microwave SQUID multiplexers as a study of various shielding configurations for the Simons Observatory. We discuss how these measurements motivated the material choice and design of the UFM magnetic shielding.
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发表时间: 2017-10
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