Trapped Field Characteristics of Stacked YBCO Thin Plates for Compact NMR Magnets: Spatial Field Distribution and Temporal Stability.
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.
Hahn
Seungyong
S
Francis Bitter Magnet Laboratory at Massachusetts Institute of Technology, Cambridge, MA 02139 USA ( syhahn@mit.edu , phone: 617-253-4161; fax: 617-253-5405).
Kim
Seok Beom
SB
Ahn
Min Cheol
MC
Voccio
John
J
Bascuñán
Juan
J
Iwasa
Yukikazu
Y