用格林函数描述放大和饱和的模型无关性
Model Independent Description of Amplification and Saturation Using Green's Function
摘要:
高增益自由电子激光(FEL)是电子束不稳定性的一种,它具有散粒噪声、放大和饱和等共同特征。在本文中,我们提出了一个新的,独立于模型的描述这些影响之间的相互作用。我们推导出一个简单的公式,在不稳定性饱和之前,可达到的最大增益。将此模型无关公式应用于自由电子激光,并与自由电子激光理论和模拟结果进行了比较。我们将这些发现的局限性应用于种子自由电子激光和相干电子冷却的自由电子激光放大器。
英文摘要:
High-gain Free Electron Laser (FEL) is one of the many electron-beam instabilities that have a number of common features linking the shot noise, the amplification and the saturation. In this paper, we present a new, model-independent description of the interplay between these effects. We derive a simple formula for a maximum attainable gain before instability saturates. Application of this model-independent formula to FELs is compared with FEL theory and simulations. We apply the limitations resulting from these findings to FEL amplifiers used for seeded FELs and for Coherent electron Cooling.
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