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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Numerical and Experimental Study to Fabricate the New Type Compact NMR Device Using Stacked HTS Bulks.

S B Kim1, T Kimoto1, Y Yano1

  • 1Department of Electrical and Electronic Engineering, Okayama University, Okayama 700-8530, Japan.

IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|September 21, 2020
PubMed
Summary

Optimizing the axial gap length between stacked High Temperature Superconducting (HTS) bulks improves magnetic field homogeneity and stability in compact NMR magnets. This research presents analytical and experimental findings for better HTS magnet performance.

Keywords:
Compact NMRFEM analysisHTS bulk annulifield homogeneitygap lengthstacking method

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Area of Science:

  • Materials Science
  • Applied Physics
  • Magnetics Engineering

Background:

  • Fabricating compact Nuclear Magnetic Resonance (NMR) magnets using stacked High Temperature Superconducting (HTS) bulk annuli faces challenges in magnetic field spatial homogeneity, temporal stability, and trapped field strength.
  • These key issues significantly impact the performance and applicability of HTS magnets in compact NMR systems.

Purpose of the Study:

  • To investigate the influence of axial gap length between stacked HTS bulks on the spatial homogeneity, temporal stability, and strength of trapped magnetic fields in a compact HTS bulk magnet.
  • To optimize the axial gap length for enhanced performance in HTS NMR applications through analytical and experimental analysis.

Main Methods:

  • Fabrication of an HTS bulk magnet with specific inner and outer diameters (20 and 60 mm) and varying heights (50 and 80 mm) based on axial gap lengths.
  • Systematic variation of the axial gap length between HTS bulks from 0 mm to 10 mm.
  • Analytical and experimental optimization of the overall magnetic field homogeneity by adjusting the axial gap length parameter.
  • Evaluation of magnetic field homogeneity and temporal stability under different magnetization field conditions.

Main Results:

  • The study identified an optimized axial gap length for the stacked HTS bulk magnet through analytical modeling.
  • Experimental results demonstrated that lower magnetization fields lead to improved magnetic field homogeneity and temporal stability of the trapped magnetic field.
  • The optimized axial gap length contributed to enhanced spatial homogeneity and strength of the generated magnetic field.

Conclusions:

  • The axial gap length between stacked HTS bulks is a critical parameter for optimizing the performance of compact HTS NMR magnets.
  • Achieving superior magnetic field homogeneity and temporal stability is possible by carefully controlling the axial gap and magnetization field.
  • This research provides valuable insights for the design and fabrication of advanced compact NMR magnets utilizing HTS technology.