1. Technique for high axial shielding factor performance of large-scale, thin, open-ended, cylindrical Metglas magnetic shields
- Author
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D. Woods, Ramesh Y. Adhikari, Brad Plaster, C. Mattie, S. Malkowski, B. Hona, and Hong-Sen Yan
- Subjects
Physics ,Physics - Instrumentation and Detectors ,Atomic Physics (physics.atom-ph) ,FOS: Physical sciences ,Shields ,Shielding factor ,Instrumentation and Detectors (physics.ins-det) ,Physics - Atomic Physics ,Magnetic field ,Ribbon ,Electromagnetic shielding ,Metglas ,Atomic physics ,Magnetic alloy ,Composite material ,Instrumentation ,FOIL method - 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-$\mu$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 $\mu$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., Comment: 4 pages, 5 figures
- Published
- 2011