Magnetic shielding
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.
- Inventors:
-
- Livermore, CA
- Walnut Creek, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 866383
- Patent Number(s):
- 4698197
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G21 - NUCLEAR PHYSICS G21B - FUSION REACTORS
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- magnetic; shielding; magnetically-conductive; filler; material; bridges; gap; multi-part; shield; structure; substantially; encloses; predetermined; volume; minimize; ingress; egress; fields; respect; heavy; concentration; single-magnetic-domain-sized; particles; magnetically; conductive; soft; iron; carbon; steel; dispersed; throughout; carrier; non-magnetic; sometimes; plastic; liquid; maximum; cross-sectional; particle; dimension; nominal; filled; epoxy; base; hardening; additive; volatility; vacuum; greases; preferably; exposed; expected; ambient; field; facilitate; alignment; lines; ambient magnetic; dispersed throughout; filler material; field lines; predetermined volume; sized particles; conductive material; magnetic field; magnetic fields; base material; magnetic material; carbon steel; carrier material; base mat; non-magnetic material; substantially encloses; magnetic shielding; facilitate alignment; conductive filler; magnetic shield; /376/174/976/
Citation Formats
Kerns, John A, Stone, Roger R, and Fabyan, Joseph. Magnetic shielding. United States: N. p., 1987.
Web.
Kerns, John A, Stone, Roger R, & Fabyan, Joseph. Magnetic shielding. United States.
Kerns, John A, Stone, Roger R, and Fabyan, Joseph. Thu .
"Magnetic shielding". United States. https://www.osti.gov/servlets/purl/866383.
@article{osti_866383,
title = {Magnetic shielding},
author = {Kerns, John A and Stone, Roger R and Fabyan, Joseph},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}