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Abstract #2707

The Effect of Magnet Flanges on Eddy Current Predictions

Dominic Michael Graziani1, Jean-Baptiste Mathieu1, Seung-Kyun Lee1

1GE Global Research, Niskayuna, NY, United States

Eddy currents from an actively shielded transverse gradient coil were evaluated for the case where the eddy current surfaces are approximated by a coaxial cylinder, as well as a cylinder with flanges. The percent error in the predicted eddy current response in the imaging volume due to neglecting the magnet flanges was determined to be non-negligible, with an observed rms error of 6.9% and 15.8% with and without pre-emphasis respectively. These results have implications when designing gradient coils with an optimal eddy current response.

Keywords

accommodate accurate accurately active actively allows analytic arbitrary assuming axially azimuthal becoming bores boundary bull coaxial coil coils compact compensation completely complex compute condition conducting conductive considered containing content continuous contribution cores corrected corresponds cylinder cylinders cylindrical design designs desirable determination determined dimensions distorting distribution eddy effective element emphasis error evaluate excluding exploited field fields finite flanged flanges flux free generating geometry global gradient ground ignoring imposed impulse include increasing induced inside jean known larger length longitudinal magnet materials math memory mesh model modeled models move neglecting negligible objects often optimization outer overall part patient play potential predicted predicting prediction predictions presence problem problems procedure produced quality rapid reduce reflect reported represent representing resolution response role scalar scenarios semi shielded shielding simple simplification simulated simulation simulations solved space stream strengths stronger structures subtracting surfaces symmetric symmetry systems taken thick towards traces transient transverse trends true truly truth view volume workstation zero