Aior core electromagnets for fast-switching of the magnetic field: the alpha-helical-cut notch-coil with variable geometry

STEPHAN KRUBER; GERMAN D. FARRHER; ESTEBAN ANOARDO

Conferencia; 9th Conference on Fast Field-Cycling NMR Relaxometry; 2015

Air core electromagnets were usuallyconsidered for the fast switching of the magnetic field in field-cycling NMRtechnology1-7. Typical technical requirements for the coils are highfield-to-power  ratio, adequate electricperformance for fast-switching of the field and NMR-compatible field homogeneitywithin the sample volume. We will describe the problem in general and showexperimental details on a recent prototype of an alpha-helical-cut notch?coilgeometry with movable pieces having tunable homogeneity and uniformlydistributed power dissipation8.  [1]- K-H. Schweikert; R. Krieg ; F. Noack.  J. Magn. Reson. 1988, 78, 77-96.[2]- S. V. Dvinskikh; Y. V. Molchanov; S. R. Filippov.Prib. Tek. Eksperim.1988, 5, 165-167.[3]- E. Anoardo; G. Galli; G. Ferrante.  Appl. Magn.Reson. 2001, 20, 365- 404.[4]- O. Lips; A. Privalov ; S. Dvinskikh; F. Fujara. J. Magn. Reson. 2001,149, 22-28.[5]- R. Kimmich; E. Anoardo. Progr. NMR Spectrosc. 2004,44, 257?320.[6]- G. Ferrante; S. Sykora. Adv. Inorg. Chem. 2005,57, 405-470. [7]- F. Fujara; D. Kruk; A. F. Privalov. Prog. NMR Spectrosc. 2014, 82, 39-69.[8]- S. Kruber; G. D. Farrher; E. Anoardo.Can. J. Phys. 2014, 92, 1430 - 1440.