The study to improve the field homogeneity of the NMR relaxometry magnets using the packaged HTS bulks with various iron rings

S. B. Kim, H. Kitamura, D. Ishizuka, D. Miyazawa

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The compact magnet for NMR device that consists of a stacked high temperature superconducting (HTS) Gd-Ba-Cu-O bulk annuli was trapped by a field cooling method. However, it was difficult to trap the uniform magnetic field above 4.7 T (200 MHz-class NMR magnet) and field homogeneity under 0.01 ppm/cm3 at liquid nitrogen temperature (77.4 K) because of the low Jc-B characteristics of present HTS bulks. On the other hand, the strength and homogeneity of the magnetic field required for NMR relaxometry device are 1.5 T and 150 ppm/cm3 respectively. It is easily to generate the trapped magnetic field over 1.5 T at 77.4 K using the stacked HTS bulks, but it is still hard to obtain 150 ppm/cm3 field homogeneity with the conventional superconducting magnet (SCM) as the magnetizing magnets. Therefore, we have studied the compensation methods to improve the field homogeneity. In this paper, we proposed the packaged HTS bulk magnet consisted of HTS bulks annuli and various iron rings as the field compensation, and investigated it in analysis and experiment.

Original languageEnglish
Article number6965581
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - Jun 1 2015

Keywords

  • NMR relaxometry
  • field homogeneity
  • packaged HTS bulk magnet
  • passive shimming
  • time stability of magnetic field

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'The study to improve the field homogeneity of the NMR relaxometry magnets using the packaged HTS bulks with various iron rings'. Together they form a unique fingerprint.

Cite this