Z-intercept Method for Improved SUSHI Gradient Solutions
Brown R, Shvartsman S, Taracila V, Eagan T
Case Western Reserve University
Good solutions to the SUSHI shielding equation, motivated by the desire for ultra-short gradients, often have current reversals and have been investigated previously using continuous current density solutions. In this work we show that a discrete coil design method can be applied to solve the SUSHI problem, with a priori use of current reversals on the primary coil. A key is that all characteristics of a transverse gradient are expressed through the set of z-intercepts where the current patterns intersect the cardinal axis =0. We illustrate the method with an X-gradient design having reduced turns density and improved magnetic performance.