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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...

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Design and validation of a large-format transition edge sensor array magnetic shielding system for space application.

A Bergen1, H J van Weers2, C Bruineman3

  • 1University of Twente, Enschede, The Netherlands.

The Review of Scientific Instruments
|November 3, 2016
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Summary

This study developed a cryogenic magnetic shielding system using mu-metal and niobium for space detectors. The system achieved a shielding factor greater than 10^6, exceeding mission requirements.

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Area of Science:

  • Astrophysics and Space Science
  • Materials Science and Engineering
  • Applied Physics

Background:

  • Transition edge sensor (TES) arrays require effective magnetic shielding for sensitive space-based observations.
  • Existing magnetic shielding solutions face challenges in meeting the stringent requirements of future space missions like X-IFU and SAFARI.

Purpose of the Study:

  • To develop and experimentally validate a cryogenic magnetic shielding system for TES-based space detector arrays.
  • To assess the performance of a combined mu-metal and superconducting niobium shield configuration.
  • To provide a realistic shielding design for future space flight applications.

Main Methods:

  • Analytical comparison of thin-walled mu-metal and superconducting shields.
  • Numerical design and verification using static and dynamic finite element method (FEM) models.
  • Experimental validation involving cooling through the superconducting transition temperature and measuring DC trapped flux and AC field attenuation.

Main Results:

  • The developed cryogenic magnetic shielding system achieved an on-axis shielding factor exceeding 10^6.
  • Residual internal DC fields were below 1 μT after field-cooling in an 85 μT axial field.
  • FEM model predictions showed good agreement with measured trapped field patterns.

Conclusions:

  • The cryogenic magnetic shielding system meets and exceeds the requirements for sensitive space detector arrays.
  • The combination of mu-metal and superconducting niobium shields offers a viable solution for advanced space missions.
  • The validated FEM models are reliable tools for designing and verifying magnetic shielding systems.