Design and characterization of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)-猫眼课题宝

DOI：

10.1117/12.2630081

发表时间：

2022-08

期刊：

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其他

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作者：

C. Núñez;J. Appel;S. M. Bruno;R. Datta;Aamir Ali;C. Bennett;S. Dahal;Jullianna Denes Couto;K. Denis;J. Eimer;Francisco Espinoza;T. Essinger-Hileman;K. Helson;J. Iuliano;T. Marriage;Carolina Morales Peréz;Deniz Augusto Nunes Valle;M. Petroff;K. Rostem;Rui Shi;D. Watts;Edward J. Wollack;Zhilei Xu

宇宙学大角度比例尺测量器(CLASS)是位于智利阿塔卡马沙漠海拔5200米的偏振敏感望远镜阵列。CLASS被设计用来在大角度尺度上测量宇宙微波背景(CMB)中的“E模”(偶宇称)和“B模”(奇宇称)偏振模式，目的是提高我们对膨胀、再电离和暗物质的理解。CLASS目前正在使用覆盖四个频段的三个望远镜进行观测：一个在40 GHz(Q)；一个在90 GHz(W1)；以及一个二色性系统在150/220 GHz(G)。在这些会议记录中，我们讨论了新的90 GHz探测器的最新设计和实验室表征。新探测器包括对过渡边缘传感器(TES)测辐射热计架构的设计更改，旨在提高稳定性和光学效率。我们组装并测试了四个新的探测器晶片，以取代W1焦平面的四个模块。这些探测器被安装在W1望远镜上，将在2022年南半球冬季实现第一次亮光。我们给出了实验室黑暗和光学测试的电热参数和带通测量结果。从实验室暗测试中，我们还测量了所有四个晶片上关于类信号频带的中位数NEP为12.3Aw√S，这低于现场32Aw√S的预期光子NEP。因此，我们预计新的探测器将受到光子噪声的限制。

The Cosmology Large Angular Scale Surveyor (CLASS) is a polarization-sensitive telescope array located at an altitude of 5,200 m in the Chilean Atacama Desert. CLASS is designed to measure “E-mode” (even parity) and “B-mode” (odd parity) polarization patterns in the Cosmic Microwave Background (CMB) over large angular scales with the aim of improving our understanding of inflation, reionization, and dark matter. CLASS is currently observing with three telescopes covering four frequency bands: one at 40 GHz (Q); one at 90 GHz (W1); and one dichroic system at 150/220 GHz (G). In these proceedings, we discuss the updated design and in-lab characterization of new 90 GHz detectors. The new detectors include design changes to the transition-edge sensor (TES) bolometer architecture, which aim to improve stability and optical efficiency. We assembled and tested four new detector wafers, to replace four modules of the W1 focal plane. These detectors were installed into the W1 telescope, and will achieve first light in the austral winter of 2022. We present electrothermal parameters and bandpass measurements from in-lab dark and optical testing. From in-lab dark tests, we also measure a median NEP of 12.3 aW√ s across all four wafers about the CLASS signal band, which is below the expected photon NEP of 32 aW√ s from the field. We therefore expect the new detectors to be photon noise limited.

Design and characterization of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)

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