Selection of a Lamination Shape for a Fast-Cycling Alternating-Gradient Magnet Core

The selection of each dimension of a C-shaped, 18-cps alternating-gradient magnet core lamination is based upon reliability, design, and cost considerations. Cost differentials of magnet-gap height, pole-tip width, return-path widths, etc., are given. Stranded-conductor coils were found significantly more economical to operate than solid conductor coils because of the reduction in eddy-current power. Three cost minimums are discussed: the width of the flux return path, the coil conductor cross section, and the coil aspect ratio. The width of the flux-return path is emphasized and is selected slightly above the minimum cost where the magnetomotive force changes slowly.