超辐射自由电子激光器的三维理论
Three-dimensional theory of superradiant free-electron lasers
AI总结：
本文提出含束流发射度和能量展宽效应的自由电子激光器超辐射三维理论，证明衍射主导稳态下超辐射峰值功率可无限增长且脉冲参数基本不变，结果与模拟及实验吻合，为下一代阿秒X射线FEL提供理论框架。
摘要：
自由电子激光器（FEL）的类孤子超辐射机制为突破高增益FEL不稳定性带宽所决定的自然极限、产生超短脉冲提供了一条极具前景的路径。本文提出了超辐射机制的三维理论，纳入了束流发射度和能量展宽的影响。本研究利用非线性FEL理论的最新进展，对类孤子超辐射给出了完整的解析描述。该理论证明了存在一种以衍射为主的稳态机制，在此机制下，超辐射峰值功率可无限增长，而脉冲持续时间和轴上强度几乎保持不变。这些结果与三维模拟结果高度吻合，也得到了直线加速器相干光源（Linac Coherent Light Source）近期实验结果的支持。本研究推进了非线性FEL理论的发展，为下一代阿秒X射线FEL提供了理论框架。
英文摘要：
The soliton-like superradiant regime of free-electron lasers (FEL) offers a promising path towards ultrashort pulses, beyond the natural limit dictated by the bandwidth of the high-gain FEL instability. In this work we present a three-dimensional theory of the superradiant regime, including the effects of beam emittance and energy spread. Our work takes advantage of recent developments in non-linear FEL theory to provide a fully analytical description of soliton-like superradiance. Our theory proves the existence of a diffraction-dominated steady-state regime in which the superradiant peak power grows indefinitely while leaving the pulse duration and on-axis intensity almost unchanged. These results are in excellent agreement with three-dimensional simulations and are supported by recent experimental results at the Linac Coherent Light Source. This work advances non-linear FEL theory and provides a theoretical framework for the next generation of attosecond x-ray FELs.
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