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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Passive Shimming for Magic-Angle-Spinning NMR.

So Noguchi1, Seungyong Hahn2, Yukikazu Iwasa2

  • 1Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814, Japan.

IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|September 1, 2020
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Summary

High-temperature superconducting (HTS) dipole magnets for magic-angle-spinning Nuclear Magnetic Resonance (NMR) spectroscopy achieve full magnetic field compensation. This study details the compensation of all field components (x, y, and z) for tilted superconducting magnets.

Keywords:
Nuclear magnetic resonancenumerical simulationshimmingsuperconducting dipole magnet

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Area of Science:

  • Physics
  • Materials Science
  • Spectroscopy

Background:

  • Development of superconducting dipole magnets using high-temperature superconducting (HTS) wires for advanced NMR applications.
  • The need for highly homogeneous magnetic fields in magic-angle-spinning NMR necessitates advanced compensation techniques.

Purpose of the Study:

  • To report the compensation of all magnetic field components (x, y, and z) for a tilted superconducting dipole magnet.
  • To address the limitations of conventional solenoid magnets that typically homogenize only the z-component of the magnetic field.

Main Methods:

  • Development of superconducting dipole magnets wound with HTS wires.
  • Application of passive and/or active shimming techniques for magnetic field compensation.
  • Detailed analysis and compensation of all x, y, and z magnetic field components.

Main Results:

  • Successful compensation of all x, y, and z magnetic field components was achieved for the tilted superconducting dipole magnet.
  • The compensation overcomes the limitations of axial symmetry found in traditional solenoid magnets.
  • This advancement enables higher magnetic field homogeneity for specialized NMR experiments.

Conclusions:

  • The developed HTS superconducting dipole magnet with full field component compensation is suitable for magic-angle-spinning NMR.
  • This technique significantly enhances magnetic field homogeneity beyond conventional methods.
  • The findings pave the way for more precise and sensitive NMR spectroscopy applications.