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

• Published in: IEEE transactions on applied superconductivity Vol. 18; no. 2; pp. 856 - 859
• Main Authors: Hahn, Seung-yong, Bascunan, Juan, Kim, Woo-Seok, Bobrov, Emanuel S., Lee, Haigun, Iwasa, Yukikazu
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Boring; Coils; Current measurement; Electrical engineering. Electrical power engineering; Electromagnets; Electronics; Exact sciences and technology; Field mapping; Harmonic analysis; High temperature superconductors; Homogeneity; Laboratories; LTS/HTS NMR magnet; Magnetic analysis; MAGNETIC FIELD; Magnetic field measurement; Magnetic fields; MAGNETS; Materials; MATHEMATICAL ANALYSIS; NMR; NMR lineshape; Nuclear magnetic resonance; Pancake coils; REMANENCE; SCREENING; screening currents induced field (SCF); Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Superconducting devices; SUPERCONDUCTIVITY; SUPERCONDUCTORS; Various equipment and components; screening currents induced field (SCF); LTS/HTS NMR magnet; Mapping; Experimental study; NMR lineshape; Screening; Superconducting magnet; Remanent magnetization; Superconducting tapes; Nuclear magnetic resonance; Field mapping; Magnetic field; Comparative study; High temperature superconductor
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2008.921225

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.