稳定波长反馈引起的失谐对自由电子激光的影响
Effect of detuning caused by wavelength stabilization feedback on free-electron laser
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摘要: 利用修改的一维非定态程序，基于美国杰弗逊实验室（JLab）Demo自由电子激光装置的参数，对高功率自由电子激光振荡器稳定波长的反馈系统进行了数值模拟。电子微脉冲为高斯型分布，每个纵向网格中取16个模拟宏电子，不考虑电子束的能散度。结果表明：当无反馈时，腔内光功率和波长都可以在一定范围内稳定；加入反馈后，由于电子束能量的变化所引起的等效失谐对整个系统有着重要的影响，甚至可能导致电子和光场失去相互作用，从而使得装置不能工作。提出应该在光场达到饱和以后再启动稳定波长反馈系统。模拟结果证明，该实施方案是合理有效的，可以避免其对FEL运行的严重影响。Abstract: In this paper, the modified 1-D time-dependent free electron laser (FEL) code is used to simulate the wavelength stabilization feedback system of a high average power FEL based on the parameters of Jefferson Lab's Demo-IR FEL facility. In the simulation, the distribution function of the electron is assumed to be Gaussian and there are 16 electrons in each longitude grid in the 1-D FEL code, the energy spread of the elctrons is ignored. The equivalent detuning caused by the electron energy changing has strong effects on the whole system of FEL. To some extent, it would destroy the interaction between the laser field and electrons, reduce the gain, even cause malfunction of the FEL. Therefore, this paper gives out a scheme to avoid the devastating influence, which shows it is feasible and ef
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Key words:
- free-electron laser /
- wavelength stabilization feedback /
- numerical simulation /
- detuning
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