Design and characterization of a 90 GHz CMB TES bolometer

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2024-03-02 DOI:10.1007/s10686-024-09927-x

Yu Xu, Zhengwei Li, Yongping Li, Yifei Zhang, Xufang Li, Xuefeng Lu, Guofu Liao, Qingchen Li, Fangjun Lu, Laiyu Zhang, Yudong Gu, Zhouhui Liu, Shibo Shu, Zhi Chang, Guofeng Wang, Yongjie Zhang, He Gao, Aimei Zhang, Daikang Yan, Congzhan Liu

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Abstract

The transition-edge sensor (TES) as a type of low-temperature superconducting detector offers superior sensitivity due to its low thermal noise. In this work, we present a prototype TES bolometer designed for cosmic microwave background (CMB) polarization measurements. This TES is made of aluminum doped with a low concentration of manganese (2000 ppm by atomic percentage), and is deposited on the SiNx membrane which connects to the silicon substrate via narrow legs. In order to calculate its electrothermal parameters we have performed dark characterizations, which include measuring voltage-current (IV) curve at different bath temperatures, square-wave time response at various bias voltages, and noise level. This TES bolometer shows a noise equivalent power (NEP) of about \(5\times 10^{-17}\) W/\(\sqrt{\textrm{Hz}}\), which meets the requirement of CMB observation. However, its saturation power is smaller and time constant is larger than what are expected. We have analyzed the reasons and will make corresponding improvements in our future work.

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90 GHz CMB TES 波束仪的设计与特性分析

过渡边沿传感器（TES）是一种低温超导探测器，因其热噪声低而具有极高的灵敏度。在这项工作中，我们展示了一个为宇宙微波背景（CMB）偏振测量而设计的过渡边传感器原型。这种 TES 由掺有低浓度锰（按原子百分比为 2000 ppm）的铝制成，沉积在 SiNx 膜上，通过狭窄的支脚与硅基底相连。为了计算其电热参数，我们对其进行了暗特性分析，包括测量不同槽温下的电压-电流（IV）曲线、不同偏置电压下的方波时间响应以及噪声水平。该TES波长计的噪声等效功率（NEP）约为（5㎎/次 10^{-17}）W/\(\sqrt\textrm{Hz}}\)，满足CMB观测的要求。但是，它的饱和功率比预期的小，时间常数比预期的大。我们分析了原因，并将在今后的工作中做相应的改进。

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来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.