BEAHDYNAMICS INWIGGLERS: TRA(3RIffiINPF9WI'R!WP(PINGWIGGLERSAYJD~ATSPEAR*

Future synchrotron radiation sources and damping rings will have a large fraction of their circumferences filled with wigglers and undulators. Thus investigations are needed of both linear and nonlinear effects of wigglers on electron beam dynamics. The nonlinear wiggler fields have been implemented in PATRICIA [l]. Results of track;qlwit$ PATRICIA for PEP with damping wigglers presented. Experimental measurements of tune shift with amplitude in a SPEAR wiggler are also included. Equation of motion