欢迎访问中国科学院大学学报,今天是

中国科学院大学学报

• • 上一篇    下一篇

基于超导体磁穿透深度的测温实验装置设计*

朱昌阳1, 边星1,2, 王金阵1,3, 刘捷1†   

  1. 1 中国科学院大学工程科学学院,北京100049;
    2 中国科学院力学研究所,北京100190;
    3 中国科学院理化技术研究所,北京 100190
  • 收稿日期:2022-12-12 修回日期:2023-03-13 发布日期:2023-03-21
  • 通讯作者: E-mail: nauty@ucas.ac.cn
  • 基金资助:
    *中央高校基本科研业务费专项资金资助

Design of low temperature measurement experimental device based on superconductor magnetic penetration depth

ZHU Changyang1, BIAN Xing1,2, WANG Jinzhen1,3, LIU Jie1   

  1. 1 College of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    2 Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
    3 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2022-12-12 Revised:2023-03-13 Published:2023-03-21

摘要: 外界磁场进入超导体的磁穿透深度随超导体的温度变化而变化,特别是在超导转变温度附近,穿透深度变化尤为剧烈。探测穿透深度变化可实现对温度变化的高分辨率测量,是重要的深低温温度测量原理。基于该基本原理,本文研究了一种利用超导体穿透深度变化、闭合超导回路磁通量子化和超导量子干涉器件(SQUID)的温度测量方案,进行了理论分析和仿真,有望在液氦温区实现nK/Hz量级的温度分辨率,并给出了具体的实验装置设计。该方法分辨率高且不引入额外热流,不需要外部持续的电流激励,可通过在被测物体表面镀超导膜等方法消除传统温度测量方法中温度计的自热效应、接触热阻等对测量的不利影响,对10K以下温区的温度测量实验与应用有重要的参考意义。

关键词: 磁穿透深度, 超导量子干涉器件, 低温温度测量

Abstract: The magnetic penetration depth of the external magnetic field into the superconductor varies with the temperature of the superconductor, especially near the superconducting transition temperature, the penetration depth changes dramatically. Detecting the change of the penetration depth can achieve high-resolution measurement of temperature changes, which is an important principle of deep and low temperature measurement. Based on this basic principle, this work studies a temperature measurement scheme using the change of superconductor penetration depth, the quantization of closed superconducting loop magnetic flux and the superconducting quantum interference device (SQUID), carries out theoretical analysis and simulation, which is expected to achieve a temperature resolution of nK/Hz in the liquid helium temperature region, and gives the specific experimental device design. This method has high resolution, does not introduce additional heat flow, and does not require continuous current excitation. It can greatly reduce the adverse effects of the traditional temperature measurement caused by thermometer self-heating effect and contact thermal resistance, etc. by plating superconducting film on the surface of the object, which is beneficial to the temperature measurement experiments and applications below 10K.

Key words: Magnetic penetration depth, Superconducting quantum interference device, Low temperature measurement

中图分类号: