A Straightforward Concept for the Design of Incomplex Notch-Coil Magnet Systems for Fast-Field-Cycling NMR

STEPHAN KRUBER; GERMÁN D. FARRHER; ESTEBAN ANOARDO

Torino

Conferencia; 8th Conference on Fast Field Cycling NMR Relaxometry; 2013

STELAR s.r.lS

Notch-coil magnet systems where considered between the first options for fast-fieldcycling (FFC) NMRapparatus [1,2]. Newer and more sophisticated designs which perform  better on the balance of the FFC NMR requirements were developed in the subsequent years  [3,4]. Beside their eminent performances, it has to be mentioned that their technical feasibilities are fairly complex(fabrication processes, machining tools, etc.).   Here we discuss a new magnet design with an incomplex technical feasibility, which in addition provides the possibility to passively or actively readjust the homogeneity of the magnetic field. The design consists of cylindrical thick-wall conductors with an uniform helical cut inside. Thereby, these conductors are arranged, so that they form a notch-coil magnet system. Together with a straightforward optimization method to determine the best geometry of the magnet system, while approximating the conductor geometry as realistic as possible, the design of a notch-coil magnet system which performs efficiently on the FFC-NMR requirements is feasible. The resulting designs are compared with other existing FFC-NMR magnet designs [4,5] to show that the concept can yield competitive results.   [1]   C. Grossl, F. Winter and R. Kimmich: Optimisation of magnetic coils for NMR field-cycling   experiment. Journal of Physics E: Scientific Instruments 18 (4) (1985) 358.[2]   F. Noack: NMR  field-cycling spectroscopy: principles and applications. Progress inNMR Spectroscopy 18 (1986) 171.[3]   K. Schweikert, R. Krieg and F. Noack: A high-field air-cored magnet coil design for fastfield-cycling NMR. Journal of Magnetic Resonance  78 (1) (1988) 77.[4]  O. Lips, A. Privalov, S. Dvinskikh, F. Fujara: Magnet Design with High B  Homogeneity         for Fast-Field-Cycling NMR Applications. Journal of Magnetic Resonance 149 (1) (2001)         22.[5]  G. Ferrante, S. Sykora: Technical Aspects of Fast Field Cycling. Advances in  Inorganic Chemistry, Vol. 57, Academic Press, 2005, pp. 405 - 470. This work is being supported by FONCYT (PICT 2008 1810), CONICET (PIP 11220090100663) and Secyt-UNC from Argentina.