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A 1.5-T/75-mm Magic-Angle-Spinning NMR Magnet
John Voccio1, Seungyong Hahn1, Youngjae Kim1
1Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139 USA.
IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|July 20, 2019
Summary
Researchers are developing a 1.5-T/75-mm room temperature bore magic-angle-spinning (MAS) Nuclear Magnetic Resonance (NMR) magnet. The goal is to achieve sub-ppm uniformity for advanced materials analysis.
Area of Science:
- Physics
- Materials Science
- Chemistry
Background:
- Development of high-field magnets is crucial for advancing Nuclear Magnetic Resonance (NMR) spectroscopy.
- Achieving high magnetic field uniformity is essential for high-resolution NMR experiments.
Purpose of the Study:
- To design and construct a 1.5-T/75-mm room temperature bore magic-angle-spinning (MAS) NMR magnet.
- To achieve magnetic field uniformity better than 0.1 ppm.
Main Methods:
- A 1.5-T field is generated by combining a 0.866-T solenoid and a 1.225-T dipole coil at the magic angle.
- Coil winding and preliminary field mapping are completed.
- Integration into a cryogenic structure and testing at 5.5 K with ferro- and cryoshims for uniformity enhancement.
Main Results:
- Both solenoid and dipole coils have been wound.
- Preliminary field mapping indicates a baseline uniformity.
- Expected bare magnet uniformity of 100 ppm over a 10-mm diameter, 20-mm-long volume.
Conclusions:
- The program is on track for completion in the final year.
- The developed magnet is expected to achieve sub-ppm uniformity after shimming.
- The system will undergo final testing in a cryogenic environment.
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