I. Introduction
MAGNETS for a combined function synchrotron [1], [2] or FFAG [3] need to generate gradient fields in large gaps. Such field gradients are usually generated by changing their gap distances (magnetic resistances) along the transverse direction with one set of excitation coils (constant magnetomotive force) or by changing the magnetomotive force using trim coils in a constant gap. This paper presents a method to generate such gradient field with a constant gap distance.