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arXiv · 1107.2625

Technique for high axial shielding factor performance of large-scale, thin, open-ended, cylindrical Metglas magnetic shields

S. Malkowski·R. Adhikari·B. Hona·C. Mattie·D. Woods·H. Yan·B. Plaster
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Abstract

Metglas 2705M is a low-cost commercially-available, high-permeability Cobalt-based magnetic alloy, provided as a 5.08-cm wide and 20.3-$μ$m thick ribbon foil. We present an optimized construction technique for single-shell, large-scale (human-size), thin, open-ended cylindrical Metglas magnetic shields. The measured DC axial and transverse magnetic shielding factors of our 0.61-m diameter and 1.83-m long shields in the Earth's magnetic field were 267 and 1500, for material thicknesses of only 122 $μ$m (i.e., 6 foil layers). The axial shielding performance of our single-shell Metglas magnetic shields, obtained without the use of magnetic shaking techniques, is comparable to the performance of significantly thicker, multiple-shell, open-ended Metglas magnetic shields in comparable-magnitude, low-frequency applied external fields reported previously in the literature.

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S. Malkowski, R. Adhikari, B. Hona, C. Mattie, D. Woods, H. Yan, B. Plaster. 2011-07-13. Technique for high axial shielding factor performance of large-scale, thin, open-ended, cylindrical Metglas magnetic shields. https://doi.org/10.1063/1.3605665

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