OPTIMIZING COUPLING IN BIPERIODIC ACCELERATING STRUCTURES

mie have studied the electrodynamic and focusing dependence on the cou pling slot and coupling cell parameters for circular and rectangular a ccelerating structures. mie find that: (i) for circular structures the coupling slot induced asymmetric electromagnetic fields of the coupli ng cell have twice the influence on the transverse beam dynamics than those of accelerating cells; (ii) the neighboring cell coupling slot l ocation can influence the beam dynamics from minimally to usefully, an d (iii) by increasing the coupling slot area while optimizing its geom etry and decreasing the coupling cell area covered by surface currents , the coupling can be increased similar to 15% with little decrease in shunt impedance.