Artículos de revistas
Air core notch-coil magnet with variable geometry for fast-field-cycling NMR
Fecha
2015-10Registro en:
Kruber, Stephan; Farrher, German David; Anoardo, Esteban; Air core notch-coil magnet with variable geometry for fast-field-cycling NMR; Academic Press Inc Elsevier Science; Journal Of Magnetic Resonance; 259; 10-2015; 216-224
1090-7807
CONICET Digital
CONICET
Autor
Kruber, Stephan
Farrher, German David
Anoardo, Esteban
Resumen
In this manuscript we present details on the optimization, construction and performance of a wide-bore (71 mm) α-helical-cut notch-coil magnet with variable geometry for fast-field-cycling NMR. In addition to the usual requirements for this kind of magnets (high field-to-power ratio, good magnetic field homogeneity, low inductance and resistance values) a tunable homogeneity and a more uniform heat dissipation along the magnet body are considered. The presented magnet consists of only one machined metallic cylinder combined with two external movable pieces. The optimal configuration is calculated through an evaluation of the magnetic flux density within the entire volume of interest. The magnet has a field-to-current constant of 0.728 mT/A, allowing to switch from zero to 0.125 T in less than 3 ms without energy storage assistance. For a cylindrical sample volume of 35 cm3 the effective magnet homogeneity is lower than 130 ppm.