Characteristics of capillary plasma wake driven by laser pulse

There is an important application for laser-driven plasma wakefield in electrons acceleration field. The idea of capillary plasma improving the effect of electron acceleration is put forward. Based on an analytical model of laser plasma wake, the interaction between laser and capillary plasma is investigated. It is shown that the amplitude of plasma wakefield in capillary is influenced by the radius of the capillary, and it rises with decreasing of the radius of capillary. With the same laser and plasma parameters, in capillary plasma these main physical quantities, such as the longitudinal scale of electron bubble, the peaks of electrostatic field and azimuthal magnetic field, increase 60% compared to that in unbound plasma. These results indicate that the plasma wake in capillary is in favor of electrons acceleration. (authors)