๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

A cylindrically symmetric magnetic shield for a large-bore 3.0 Tesla magnet

โœ Scribed by Dr. James R. Ewing; Rory Warner; Joseph A. Helpern

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
413 KB
Volume
29
Category
Article
ISSN
0740-3194

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โœฆ Synopsis

Abstract

A 3.0 Tesla, 0.80โ€m bore magnet replaced our previous 1.9 Tesla, 0.76โ€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 preโ€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.

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