Metglas 2705M is a low-cost commercially available, high-permeability cobalt-based magnetic alloy, provided as a 5.08-cm wide and 20.3-μm 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 Earths magnetic field were 267 and 1500, for material thicknesses of only 122 μm (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.
|Review of Scientific Instruments
|Published - Jul 2011
Bibliographical noteFunding Information:
This work was supported in part by the (U.S.) Department of Energy Office of Nuclear Physics under Award No. DE-FG02-08ER41557, and by the University of Kentucky. We thank R. Golub and A. Pérez Galván for valuable discussions. B.P. thanks the Kellogg Radiation Laboratory at the California Institute of Technology for the hospitality during a visit during which time this article was written.
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