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Hysteresis prediction inside magnetic shields and application.

Igor Morić1, Charles-Marie De Graeve2, Olivier Grosjean3

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Summary

A new model predicts and compensates for magnetic hysteresis in Mumetal shields, significantly improving magnetic field attenuation for sensitive applications like the PHARAO space clock.

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Area of Science:

  • Physics
  • Materials Science
  • Aerospace Engineering

Background:

  • Mumetal magnetic shields are crucial for shielding sensitive instruments from external magnetic fields.
  • Hysteresis in magnetic materials can degrade shielding performance, especially under ultra-low frequency perturbations.
  • Accurate modeling of magnetic hysteresis is essential for advanced applications.

Purpose of the Study:

  • To develop a predictive model for hysteresis in Mumetal magnetic shields.
  • To implement this model in an active compensation system to enhance magnetic field attenuation.
  • To integrate the system into the PHARAO cold atom space clock for the ACES space mission.

Main Methods:

  • Developed a simple model to describe and predict hysteresis behavior in Mumetal shields.
  • Subjected shields to ultra-low frequency (<0.01 Hz) magnetic perturbations (<60 μT).
  • Implemented the predictive model in a software for an active compensation system.

Main Results:

  • The model accurately describes and predicts hysteresis in Mumetal magnetic shields.
  • The active compensation system increased longitudinal magnetic field attenuation by two orders of magnitude.
  • The system was successfully integrated into the PHARAO cold atom space clock.

Conclusions:

  • The developed model and active compensation system significantly enhance magnetic shielding performance.
  • This technology is vital for the precision required by space-based atomic clocks.
  • The system's successful integration paves the way for improved performance in the ACES space mission.