Title :
Magic-Angle-Spinning NMR Magnet Development: Field Analysis and Prototypes
Author :
Voccio, John ; Seungyong Hahn ; Dong Keun Park ; Jiayin Ling ; Youngjae Kim ; Bascunan, Juan ; Iwasa, Yukikazu
Author_Institution :
Francis Bitter Magn. Lab., Massachusetts Inst. of Technol., Cambridge, MA, USA
Abstract :
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 a z -axis 0.866-T solenoid and an x-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.
Keywords :
magic angle spinning; multifilamentary superconductors; niobium alloys; persistent currents; superconducting coils; superconducting magnets; titanium alloys; windings; NbTi; bore magic-angle-spinning nuclear magnetic resonance magnet; coil design; field analysis; magic-angle-spinning NMR magnet development; magnetic analysis; multifilamentary NbTi wire; persistent NbTi-NbTi joints; persistent mode; prototype dipole coils; rotation axis; size 75 mm; temperature 293 K to 298 K; temperature 4.2 K; winding machine; x-axis dipole; z -axis solenoid; Coils; Magnetic field measurement; Magnetic resonance imaging; Perpendicular magnetic anisotropy; Superconducting magnets; Windings; Magic angle; magnet; nuclear magnetic resonance (NMR); spinning; superconductor;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2013.2245934
