PARAMETERS OF ELECTRON BUNCHES AT OFF-AXIS INJECTION INTO A THREE-ZONE RECTANGULAR DIELECTRIC-PLASMA ACCELERATING STRUCTURE

The results of numerical three-dimensional PIC simulations of self-consistent dynamics of off-axis charged particles under the influence of the excited wake field in a three-zone rectangular dielectric-plasma accelerating structure are presented, which showed the possibility of simultaneous acceleration of the test electron bunch and its focusing, that made it possible to transport off-axis bunches. In a vacuum structure, bunch focusing is completely absent, but stable bunch transport over a finite length is also possible, although in a somewhat smaller range of transverse displacements. The limiting values of the permissible displacement of the test bunch are estimated, which allow bunches to be carried through a resonator of finite length without charge losses on dielectric or metal surfaces.