Research on Thermal Expansion Characteristics Measurement of Launch Lock Mechanism for SIS Mixer’s Space Application

Q4 Physics and Astronomy

Chinese Astronomy and Astrophysics Pub Date : 2023-10-01 DOI:10.1016/j.chinastron.2023.11.010

ZHANG Bi-cheng , LIN Zhen-hui , YAO Qi-jun

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引用次数: 0

Abstract

The High Sensitivity Terahertz Detection Module (HSTDM) is one of the scientific payloads of the Chinese Space Survey Telescope. The core of the HSTDM is the NbN superconducting SIS (Superconductor Insulator Superconductor) mixer, operating around 10 K. The installation structure of the SIS mixer needs to be specially designed to cope with the mechanical vibration during the launch phase and the thermal insulation requirements during the operation phase. Material thermal expansion characteristics investigation based on low-temperature LVDT (Linear Variable Differential Transformer) measurement and scratch marking measurement were carried out to confirm the validity of the thermal expansion lock mechanism design. The two methods are cross verified. The LVDT experimental measurement results show that the shrinkage rate of Teflon changes with temperature and meets the theoretical model. At the same time, we verified the LVDT results with scratch marking method. Consistently, the shrinkage rate of the material is 1.86 $%$ at 80 K, so the Teflon front-end lock mechanism of the SIS mixer can achieve effective separation after cooling down.

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用于 SIS 混合器空间应用的发射锁定机构热膨胀特性测量研究

高灵敏度太赫兹探测模块（HSTDM）是中国空间巡天望远镜的科学有效载荷之一。HSTDM 的核心是工作温度在 10 K 左右的铌镍超导 SIS（超导体绝缘体超导体）混频器。SIS 混频器的安装结构需要专门设计，以应对发射阶段的机械振动和运行阶段的隔热要求。为了确认热膨胀锁定机构设计的有效性，我们基于低温 LVDT（线性可变差分变压器）测量和划痕测量对材料热膨胀特性进行了研究。两种方法进行了交叉验证。LVDT 实验测量结果表明，聚四氟乙烯的收缩率随温度变化，符合理论模型。同时，我们用划痕标记法验证了 LVDT 的结果。一致的是，材料在 80 K 时的收缩率为 1.86%，因此 SIS 混合器的聚四氟乙烯前端锁定机构在冷却后可以实现有效分离。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chinese Astronomy and Astrophysics Physics and Astronomy-Astronomy and Astrophysics

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： The vigorous growth of astronomical and astrophysical science in China led to an increase in papers on astrophysics which Acta Astronomica Sinica could no longer absorb. Translations of papers from two new journals the Chinese Journal of Space Science and Acta Astrophysica Sinica are added to the translation of Acta Astronomica Sinica to form the new journal Chinese Astronomy and Astrophysics. Chinese Astronomy and Astrophysics brings English translations of notable articles to astronomers and astrophysicists outside China.