LARGE acceleration gradient is the major advantage of
the advanced accelerators to help high-energy physics
study reach teraelectron-volt energy. Among the present advanced
accelerator concepts, the plasma wakefield acceleration
(PWFA) represents one of the most promising ways to achieve
acceleration of charged-particle beams with gradients that are
much larger than that in conventional RF Linac. In PWFA, an
electron beam is compressed longitudinally through magnetic
dispersion, producing an ultrashort current pulse with peak
current that is greater than