There are two major issues that are to be confronted in the design of a Fixed-Field Alternating-Gradient (FFAG) accelerator, namely: (ⅰ) the stability of motion over the large momentum range needed for the beam acceleration, and (ⅱ) the compactness of the trajectories over the same momentum range to limit the dimensions of the magnets. There are a number of rules that need to be followed to resolve these issues. In particular, the magnet arrangement in the accelerator lattice and the distribution of the bending and focusing fields are to be set properly in accordance with these rules. In this report we describe four of these rules that ought to be applied for the optimum design of a FFAG accelerator, especially in the case of proton beams.
展开▼
