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                                 Abstract:With the advent of the chirped-pulse-amplification technology, one is able to obtain the ultrashort laser pulses with a focused intensity over 1018W/cm2 and with a duration less than 100fs. Such laser pulses can accelerate electrons to relativistic energy directly. More importantly, they can drive large-amplitude plasma waves, so called the laser wakefields, which can accelerate electrons to the energy of hundreds of MeV in mm-length. In this paper, we introduce briefly various schemes of the laser wakefield accelerators, the recent progress, and the remaining challenges.
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