Magic-Angle-Spinning NMR Magnet Development: Field Analysis and Prototypes.
We are currently working on a program to complete a 1.5 T/75 mm RT bore magic-angle-spinning nuclear magnetic resonance magnet. The magic-angle-spinning magnet comprises az-axis 0.866-T solenoid and anx-axis 1.225-T dipole, each to be wound with NbTi wire and operated at 4.2 K in persistent mode. A combination of the fields creates a 1.5-T field pointed at 54.74 degrees (magic angle) from the rotation (z) axis. In the first year of this 3-year program, we have completed magnetic analysis and design of both coils. Also, using a winding machine of our own design and fabrication, we have wound several prototype dipole coils with NbTi wire. As part of this development, we have repeatedly made successful persistent NbTi-NbTi joints with this multifilamentary NbTi wire.
the Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
John
J
Voccio
Seungyong
S
Hahn
Dong Keun
DK
Park
Jiayin
J
Ling
Youngjae
Y
Kim
Juan
J
Bascuñán
Yukikazu
Y
Iwasa
Magic angle; magnet; nuclear magnetic resonance (NMR); spinning; superconductor