Magnetic shielding

Induced nuclear reactions: processes – systems – and elements – Nuclear fusion – Magnetic confinement of plasma

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174 35MS, 174 35R, G21B 100

Patent

active

046981977

ABSTRACT:
A magnetically-conductive filler material bridges the gap between a multi-part magnetic shield structure which substantially encloses a predetermined volume so as to minimize the ingress or egress of magnetic fields with respect to that volume. The filler material includes a heavy concentration of single-magnetic-domain-sized particles of a magnetically conductive material (e.g. soft iron, carbon steel or the like) dispersed throughout a carrier material which is generally a non-magnetic material that is at least sometimes in a plastic or liquid state. The maximum cross-sectional particle dimension is substantially less than the nominal dimension of the gap to be filled. An epoxy base material (i.e. without any hardening additive) low volatility vacuum greases or the like may be used for the carrier material. The structure is preferably exposed to the expected ambient magnetic field while the carrier is in a plastic or liquid state so as to facilitate alignment of the single-magnetic-domain-sized particles with the expected magnetic field lines.

REFERENCES:
patent: 2877286 (1959-03-01), Vance et al.
patent: 3231663 (1966-01-01), Schwartz
patent: 3347978 (1967-10-01), Simon et al.
patent: 3903328 (1975-09-01), Burdette, Jr. et al.
patent: 4163821 (1979-08-01), Nienart et al.
patent: 4413527 (1983-11-01), Sugiura et al.
patent: 4434541 (1984-03-01), Powers, Jr.

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