Field Mapping, NMR Lineshape, and Screening Currents Induced Field Analyses for Homogeneity Improvement in LTS/HTS NMR Magnets

Author

Hahn, Seung-Yong ; Bascuñán, Juan ; Kim, Woo-Seok ; Bobrov, Emanuel S. ; Lee, Haigun ; Iwasa, Yukikazu

Author_Institution

Francis Bitter Magn. Lab., Massachusetts Inst. of Technol., Cambridge, MA

Volume

18

Issue

2

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

856

Lastpage

859

Abstract

This paper describes two general methods: field map processing and NMR lineshape analysis, that we are currently using for the on-going research of field improvement techniques specifically applied to our 700 MHz LTS/HTS NMR magnet. The validity of the methods is verified with comparison between calculations and experiments. Also, a simple but effective analysis has been used to identify the principal source of a remanent magnetic field measured in the bore of the 700 MHz LTS/HTS NMR magnet: the screening current induced field (SCF) from the 100-MHz HTS insert, comprised of 48 double pancake coils, each wound with Bi2223 tape.

Keywords

magnetic fields; magnets; nuclear magnetic resonance; Bi2223 tape; LTS-HTS NMR magnets; NMR lineshape; double pancake coils; field mapping; frequency 700 MHz; homogeneity improvement; screening current induced field; screening currents; Field mapping; LTS/HTS NMR magnet; NMR lineshape; screening currents induced field (SCF);

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2008.921225

Filename

4497933