约束可溯源的液氮杜瓦设计用于低噪声高温超导量子干涉磁强计

中文摘要 AI 辅助

紧凑型高温超导量子干涉器件（HTS-SQUID）磁强计需要一种液氮杜瓦，该杜瓦需在运行持续时间与仪器包络和质量约束之间取得平衡。在此，我们引入了一种约束可溯源的设计工作流程，其中在固定的外部包络体积和基于几何形状的质量限制下，扫描了主体半径和颈部长度分数。最长持续时间的可行网格点位于3.85千克和550毫米约束交点的相邻处，预测从仅主体初始填充到残余液深10毫米的保持时间为224小时。对参考杜瓦进行了137.3小时的实验监测，消耗了其初始库存中的1.22升液氮。在前40小时校准的热模型重现了剩余的97.3小时。在液氮温度下的器件测量显示超导转变和类夫琅禾费结响应，最大电压调制深度为36.2微伏，在100至1000赫兹范围内的中值噪声水平为41.5飞特斯拉每平方根赫兹。这些结果为在耦合约束下选择杜瓦几何形状建立了一种可重复的方法，并证明了与长续航和低噪声HTS-SQUID磁强计系统的兼容性。

英文摘要

Compact high-temperature superconducting quantum interference device (HTS-SQUID) magnetometers require a liquid-nitrogen Dewar that balances operating duration against instrument-envelope and mass constraints. Here we introduced a constraint-traceable design workflow in which body radius and neck-length fraction were scanned under fixed outer-envelope volume and geometry-based mass limits. The longest-duration feasible grid point lay adjacent to the 3.85 kg and 550 mm constraint intersection, predicting 224 h hold time from a body-only initial fill to a residual liquid depth of 10 mm. A reference Dewar was experimentally monitored for 137.3 h, consuming 1.22 L liquid-nitrogen of its initial inventory. A thermal model calibrated over the first 40 h reproduced the remaining 97.3 h. Device measurements at liquid-nitrogen temperature showed a superconducting transition and Fraunhofer-like junction response, a maximum voltage-modulation depth of 36.2 $μ$V, and a median noise level of 41.5 fT Hz$^{-1/2}$ from 100 to 1000 Hz. These results establish a reproducible method for selecting Dewar geometry under coupled constraints and demonstrate compatibility with long-endurance and low-noise HTS-SQUID magnetometer systems.

发表机构

• State Key Laboratory of Spintronics, Hangzhou International Innovation Institute, Beihang University（自旋电子学国家重点实验室，杭州国际创新学院，北京航空航天大学）
• Fert Beijing Institute, School of Integrated Circuit Science and Engineering, Beihang University（费特北京研究院，集成电路科学与工程学院，北京航空航天大学）
• National Institute of Metrology（中国计量科学研究院）

机构由 AI 辅助整理，请以论文原文为准。

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14 pages, 4 figures