CAJ | 학술논문

缩短自由电子激光器中的束-波互作用饱和长度，能够有效地降低加速器、摇摆器以及整体器件的成本。为探索缩短束-波互作用饱和长度的途径，本文作者采用非线性数值模拟方法，研究自由电子激光放大器中关键参数对束-波互作用饱和长度的影响。以一种红外自由电子激光放大器为例，对摇摆器磁场振幅在3000 Ga做±10％较大调整，对应的饱和长度5．92 m，仅缩短0．11 m（减少不足2％）；通过对摇摆器周期、电子束能量、激光波长的搭配进行优化，当摇摆器周期为3．8 cm、电子束能量为105 MeV、激光波长为853 nm时达到最优，使饱和长度缩短到4．35 m（减少26．5％）。结果表明：摇摆器振幅对饱和长度的影响不大，但电子束能量、摇摆器周期、激光波长三者之间的恰当匹配至关重要，可明显缩短对应的束-波互作用饱和长度。
축단자유전자격광기중적속-파호작용포화장도，능구유효지강저가속기、요파기이급정체기건적성본。위탐색축단속-파호작용포화장도적도경，본문작자채용비선성수치모의방법，연구자유전자격광방대기중관건삼수대속-파호작용포화장도적영향。이일충홍외자유전자격광방대기위례，대요파기자장진폭재3000 Ga주±10％교대조정，대응적포화장도5．92 m，부축단0．11 m（감소불족2％）；통과대요파기주기、전자속능량、격광파장적탑배진행우화，당요파기주기위3．8 cm、전자속능량위105 MeV、격광파장위853 nm시체도최우，사포화장도축단도4．35 m（감소26．5％）。결과표명：요파기진폭대포화장도적영향불대，단전자속능량、요파기주기、격광파장삼자지간적흡당필배지관중요，가명현축단대응적속-파호작용포화장도。
The cost of a free-electron laser ( FEL) can be substantially reduced by shortening the saturation length of the beam-wave interaction .In order to study the way of shortening the saturation length of the beam-wave interaction , the authors research the impact of the key parameters on the free electron laser amplifier to the saturation length of the beam -wave interaction by nonlinear nu-merical simulation method .Taking an infrared FEL amplifier as example , a range of ±10%variation around 3000 Gauss results in a saturation length shortening of 0.11 m from 5.92 m (less than 2%), but optimizing the wiggler period , the electron beam energy and the light wavelength shortens the saturation length to 4.35 m (about 26.5%).In the present paper, results show that the wiggler am-plitude has a slight influence on shortening the saturation length , whereas the proper matching of the wiggler period , the laser wave-length and the electron-beam energy is able to greatly shorten the saturation length and increase the saturation power .