Nuclear magnetic resonance radiation damping in inhomogeneous radio frequency fields: The toroid cavity detector

Momot, Konstantin I. & Johnson (Jr), Charles S. (2001) Nuclear magnetic resonance radiation damping in inhomogeneous radio frequency fields: The toroid cavity detector. Journal of Chemical Physics, 115(9), pp. 3992-4002.

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A theory is presented for radiation damping ~RD! in the toroid cavity nuclear magnetic resonance detector, a cylindrically symmetric inhomogeneous-rf field detector in which the magnitude of B1 is inversely proportional to the distance from the cylindrical symmetry axis. The equations of motion of the magnetization components are obtained and discussed. Numerical simulations of conventional- and composite-pulse experiments are presented, along with a discussion of the effects of RD on the evolution of magnetization. Preliminary simulations of RD in the presence of inhomogeneous line broadening are also presented. The signature effect of radiation damping in the TCD is the winding or unwinding of magnetization gratings that has recently been observed by other researchers. The observed magnitude of the effect is linked to the effective filling factor, which currently appears to be limited by the stray inductance of the detection circuit. The results are of interest in connection with recent findings regarding the interaction of RD with the dipolar demagnetizing field.

Impact and interest:

2 citations in Scopus
2 citations in Web of Science®
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280 since deposited on 02 Dec 2005
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ID Code: 2675
Item Type: Journal Article
Refereed: Yes
Keywords: nuclear magnetic resonance hardware, NMR probe, signal detection, rotating frame imaging, TCD, toroid cavity detector, radiation damping
DOI: 10.1063/1.1386655
ISSN: 0021-9606
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2001 American Institute of Physics
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 02 Dec 2005 00:00
Last Modified: 09 Jun 2010 12:28

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