Long sequence of relativistic electron bunches as a driver in wakefield method of charged particles acceleration in plasma

摘要

Using LCODE 2.5D-simulation of wakefield excitation in plasma by a long sequence of relativistic electron bunches was performed. For the resonant sequence wakefields add coherently until the wave nonlinearity comes into play. The mechanism is found out which enables resonant excitation of the wakefield even if the bunch repetition frequency appreciably differs from the plasma frequency. Conditions for enhancement of excitation efficiency, acceleration gradient, and transformation ratio were investigated.