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A cylindrically symmetric magnetic shield for a large‐bore 3.0 Tesla magnet
Author(s) -
Ewing James R.,
Warner Rory,
Helpern Joseph A.
Publication year - 1993
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910290319
Subject(s) - magnet , electromagnetic shielding , shield , dipole , dipole magnet , fabrication , nuclear magnetic resonance , physics , materials science , superconducting magnet , composite material , geology , petrology , medicine , alternative medicine , pathology , quantum mechanics
A 3.0 Tesla, 0.80‐m bore magnet replaced our previous 1.9 Tesla, 0.76‐m magnet. The 3.0 Tesla replacement magnet had a dipole moment of 1.7 with respect to that of the 1.9 Tesla magnet. The pre‐existing cylindrically symmetric passive steel shielding was modified to confine the fringe fields of the replacement magnet to match those of the previous magnet. A cylindrically symmetric inner shield insert of about 20,000 kg was designed, fabricated, and installed. Upon energization of the magnet, the combined shielding met all design criteria. Alternative designs, optimization of cylindrically symmetric designs, and costs of fabrication, are presented herein.