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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

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Magic-Angle-Spinning NMR Magnet Development: Field Analysis and Prototypes.

John Voccio¹, Seungyong Hahn, Dong Keun Park

¹the Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.

IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee

|September 24, 2013

Summary

Researchers are developing a 1.5 T/75 mm bore magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) magnet. Key components and persistent joints for the superconducting coils have been successfully designed and prototyped.

Keywords:

Magic angle magnet nuclear magnetic resonance (NMR)spinning superconductor

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Area of Science:

Physics
Materials Science
Engineering

Background:

Development of high-field magnets is crucial for advancing nuclear magnetic resonance (NMR) spectroscopy.
Magic-angle-spinning (MAS) techniques require precisely controlled magnetic fields for optimal performance.
Superconducting magnets, particularly those using Niobium-Titanium (NbTi) wire, are essential for achieving high field strengths.

Purpose of the Study:

To complete the design and initial prototyping of a 1.5 T/75 mm bore MAS NMR magnet.
To develop and test critical components, including superconducting coils and persistent joints.
To validate the feasibility of constructing a magnet with a combined axial and transverse field configuration.

Main Methods:

Magnetic analysis and coil design for a 0.866-T solenoid and a 1.225-T dipole.
Winding of prototype dipole coils using NbTi wire on a custom-built winding machine.
Fabrication and testing of persistent NbTi-NbTi joints for superconducting connections.

Main Results:

Successful completion of magnetic analysis and design for both solenoid and dipole coils.
Fabrication of several prototype dipole coils using NbTi wire.
Repeated successful creation of persistent NbTi-NbTi joints, demonstrating reliable superconducting connections.

Conclusions:

The first year of the program has successfully achieved critical design and prototyping milestones for the 1.5 T MAS NMR magnet.
The developed methods for coil winding and joint fabrication are viable for constructing the superconducting magnet.
The project is on track to deliver a functional MAS NMR magnet within the planned 3-year timeframe.