• X.J. Shu
  IAP, Beijing
• T.C. Peng
  Wuhan University, Wuhan

It is proposed that a chirped pulse can be amplified using a free-electron laser. Chirped pulse amplification (CPA) technology is one of the major ways to get high power and ultra short FEL pulse．Linear chirped pulse amplification at single pass FEL amplifier is studied through numerical simulations using our 1D time-dependent code GOFEL-P. The processes of chirped pulses with different chirped parameters being amplified by normal FEL amplifier or the FEL amplifier with energy-chirped beam are studied. The peak power and width of the final compressed pulse with different chirped parameters have been calculated. The results show that, the normal FEL amplifier can amplify the chirped pulse, the peak power of the final compressed pulse can reach 10s GW and the width of the pulse can be 10s fs with the parameters of TTF. In the case of using the energy-chirped beam to amplify chirped pulse, the gain bandwidth of the FEL amplifier will be wider and the chirped parameter will be larger. The peak power of the final compressed pulse can even reach near 10 times larger and the width of the pulse 10 times shorter than that with normal electron beam.