title: Trapped Field Characteristics of Stacked YBCO Thin Plates for Compact NMR Magnets: Spatial Field Distribution and Temporal Stability.
abstract: This paper presents experimental and analytical results of trapped field characteristics of a stack of square YBCO thin film plates for compact NMR magnets. Each YBCO plate, 40 mm × 40 mm × 0.08 mm, has a 25-mm diameter hole at its center. A total of 500 stacked plates were used to build a 40-mm long magnet. Its trapped field, in a bath of liquid nitrogen, was measured for spatial field distribution and temporal stability. Comparison of measured and analytical results is presented: the effects on trapped field characteristics of the unsaturated nickel substrate and the non-uniform current distribution in the YBCO plate are discussed.
authors.affiliation: Francis Bitter Magnet Laboratory at Massachusetts Institute of Technology, Cambridge, MA 02139 USA ( syhahn@mit.edu , phone: 617-253-4161; fax: 617-253-5405).
authors.forename: Seungyong
authors.initials: S
authors.lastname: Hahn
authors.forename: Seok Beom
authors.initials: SB
authors.lastname: Kim
authors.forename: Min Cheol
authors.initials: MC
authors.lastname: Ahn
authors.forename: John
authors.initials: J
authors.lastname: Voccio
authors.forename: Juan
authors.initials: J
authors.lastname: Bascuñán
authors.forename: Yukikazu
authors.initials: Y
authors.lastname: Iwasa