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A novel phase compensated NMR system

University of British Columbia

A novel continuous-wave (cw) Nuclear Magnetic Resonance (NMR) Q-meter which utilizes phase compensation to force the resonant frequency of the tuned circuit to track the input rf frequency has been developed. This technique eliminates the distortions in the NMR lineshape which characterize conventional systems. A prototype system based upon this principle was constructed and used to measure the enhanced nuclear alignment of a polarized deuteron target. A general theoretical description of the performance of this type of system was developed. The adequacy of this description was tested and verified in the prototype system. Deviations from the theoretical predictions are discussed and the important factors which need be considered in the design of such a system are presented. Deuteron thermal equilibrium NMR lineshapes were measured with a precision of ± 5% using the prototype system. Results have been shown to be reproducible for periods of at least three weeks without the need for any parameter adjustment in the phase compensation system. In addition the tensor polarization results obtained from the NMR data are shown to be in agreement with expectations based upon nuclear scattering data.

Text

2010-07-10

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http://hdl.handle.net/2429/26293

Engineering Physics

University of British Columbia

Graduate