- #1
_maxim_
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Hi there,
we have a NMR spectrometer equipped with a standard bore 54mm cryomagnet working at 14.1 T (600 MHz Larmor Frequency) produced by Oxford.
I would implement a special probe capable of generating a RF pulse and reading a NMR answer from a sample that is not standard for such experiments (typically a cylinder 40-60mm high x 5 or 10mm diameter in a standard glass tube) , but a "disc" of 1-2mm high only with a diameter of 5 or 10mm, contained into a glass tube of coarse.
Because of its lower height than the one of a probe coil, the disc introduces an enormous inhomogeneity and the linewidth is far from being a lorenzian line. There is no way to correct such a "bad magnetic field" by the well know "shimming" procedure.
I was wondering if there is a way to desing a perfect coil for this application, since the sample will be a disc of liquid substance. Of course, the coil circuitery must be complete with all the capacitors needed to implement a resonance circuit (Tuning and Matching) at a given frequency (i.e. 600 MHz):
Obviously the RF coild must generate and read an electromagnetic field othogonal with respect the main field generated by the superconducting magnet.
Does anyone have experience on RF coil design?
Very quick intro in NMR
we have a NMR spectrometer equipped with a standard bore 54mm cryomagnet working at 14.1 T (600 MHz Larmor Frequency) produced by Oxford.
I would implement a special probe capable of generating a RF pulse and reading a NMR answer from a sample that is not standard for such experiments (typically a cylinder 40-60mm high x 5 or 10mm diameter in a standard glass tube) , but a "disc" of 1-2mm high only with a diameter of 5 or 10mm, contained into a glass tube of coarse.
Because of its lower height than the one of a probe coil, the disc introduces an enormous inhomogeneity and the linewidth is far from being a lorenzian line. There is no way to correct such a "bad magnetic field" by the well know "shimming" procedure.
I was wondering if there is a way to desing a perfect coil for this application, since the sample will be a disc of liquid substance. Of course, the coil circuitery must be complete with all the capacitors needed to implement a resonance circuit (Tuning and Matching) at a given frequency (i.e. 600 MHz):
Obviously the RF coild must generate and read an electromagnetic field othogonal with respect the main field generated by the superconducting magnet.
Does anyone have experience on RF coil design?
Very quick intro in NMR