Title :
Trapped Field Characteristics of Stacked YBCO Thin Plates for Compact NMR Magnets: Spatial Field Distribution and Temporal Stability
Author :
Hahn, Seungyong ; Kim, Seok Beom ; Ahn, Min Cheol ; Voccio, John ; Bascuñán, Juan ; Iwasa, Yukikazu
Author_Institution :
Francis Bitter Magn. Lab., Massachusetts Inst. of Technol., Cambridge, MA, USA
fDate :
6/1/2010 12:00:00 AM
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.
Keywords :
barium compounds; current distribution; magnetic field measurement; nickel; nuclear magnetic resonance; superconducting magnets; superconducting thin films; yttrium compounds; Ni; YBCO; compact NMR magnets; current distribution; liquid nitrogen; size 0.08 mm; size 25 mm; size 40 mm; spatial field distribution; square YBCO thin film plates; stacked thin plates; temporal stability; trapped field characteristics; unsaturated nickel substrate; Compact NMR; YBCO plate; spatial homogeneity; temporal stability; trapped field;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2043832
