Comparative Study Of Laser Pulses Guiding In Capillary Waveguides And Plasma Channels At Conditions Of Non-Perfect Focusing

For producing of high-quality accelerated electron bunches the structure of laser fields and accelerating wakefields inside the guiding structure should be regular enough to conserve a high value of accelerating longitudinal field throughout the propagation and avoid strong defocusing transverse fields. We had compared the efficiency of capillary waveguides and plasma channels in achieving of this goal, taking in mind different possible nonsymmetric conditions (like non-symmetric shape of laser spot, non-zero angle of incidence of a laser pulse or deviation of a focusing point relatively to the guiding structure axis) of laser pulses focusing in a guiding structure, always available in real experiments. The model for laser pulses propagation in guiding structures for the case of arbitrary dissymmetry of laser focusing is presented.