能量啁啾电子束自由电子激光放大啁啾脉冲
Using energy-chirped electron beam free-electron laser to amplifiy chirped pulse
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摘要: 提出采用具有能量啁啾电子束的自由电子激光放大器放大啁啾脉冲，分析说明了它的工作机理和滑移现象对其的影响。采用研制的1维非定态程序GOFEL-P，对能量啁啾自由电子激光放大器放大啁啾脉冲的过程进行了数值模拟和分析，计算了不同啁啾参数的脉冲被放大后的腔外压缩情况。结果表明：与单能电子束时相比，能量啁啾自由电子激光可以放大具有更大啁啾参数的啁啾脉冲，使压缩后的脉冲峰值功率增大至568 GW，脉冲宽度缩短至2.29 fs,大幅增强自由电子激光放大啁啾脉冲以及腔外压缩脉冲的效果。Abstract: It is proposed that a chirped pulse can be better amplified using a chirped electron beam at an free-electron laser (FEL), and the reasons of which and the effects of the slippage between the optical and electron beams are analyzed. The processes of the FEL amplifier with energy-chirped beam amplifying chirped pulses with different chirped parameters are studied through numerical simulations using our 1D time-dependent code GOFEL-P. The peak power and width of the final compressed pulse with different chirped parameters have been computed. The results show that, comparing with a normal electron beam, the energy-chirped beam can amplify chirped pulse with larger chirped parameter, and the peak power of the final compressed pulse can even reach near 10 times larger and the width of the pulse
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Key words:
- free-electron laser /
- amplifier /
- energy-chirped beam /
- chirped pulse /
- numerical stimulations
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