Development of HTS Bulk NMR Relaxometry with Ring-Shaped Iron

Seokbeom Kim, Susumu Fukada, Ryota Nomura, Hiroshi Ueda

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The compact NMR magnets consisted of the stacked higherature superconducting (HTS) GdBCO bulk annuli trapped by field cooling (FC) method have been developed. The target values of strength and homogeneity of magnetic field for proposed NMR relaxometry are 1.5 T and 150 ppm/cm3, respectively, at liquid nitrogen temperature. Since last year, we have been developing a hardware and software to detect the NMR signals by ourselves. Therefore, we needed to determine the final structure of HTS bulk magnet to be used in the NMR relaxometry. We can obtain the trapped magnetic field over 1.5 T at 77.4 K experimentally. However, it is still difficult to obtain the magnetic field homogeneity under 150 ppm/cm3 experimentally, due to their different superconducting properties. Therefore, in this study, four types of HTS bulk magnets to determine the final structure of compact NMR relaxometry were designed and their field properties including the degraded HTS bulk were investigated using three-dimensional finite-element method analysis. The field properties of 10-stacked HTS bulk magnets with the ring-shaped irons for field compensation and the degraded HTS bulk were investigated experimentally.

Original languageEnglish
Article number8226798
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - Apr 2018


  • HTS bulk magnets
  • NMR relaxometry
  • degraded HTS bulks
  • field homogeneity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Development of HTS Bulk NMR Relaxometry with Ring-Shaped Iron'. Together they form a unique fingerprint.

Cite this