FLASH辐射的相干特性
Coherence properties of the radiation from FLASH
摘要：
FLASH是第一个在真空紫外和软X射线波长范围内运行的自由电子激光用户设施。许多用户实验需要辐射的空间和时间相干特性的知识。在本文中，我们提出了一个分析的相干性辐射的基本和高奇频率谐波。我们发现，时间和空间相干性达到最大值接近自由电子激光饱和，但可能会显着降低后饱和制度。我们还发现，短脉冲的指向稳定性是有限的，由于事实上，非方位角的自由电子激光本征模没有得到充分的抑制。我们讨论了提高横向相干度和指向稳定性的可能途径。
英文摘要：
FLASH is the first free electron laser user facility operating in the vacuum ultraviolet and soft x-ray wavelength range. Many user experiments require knowledge of the spatial and temporal coherence properties of the radiation. In this paper we present an analysis of the coherence properties of the radiation for the fundamental and for the higher odd frequency harmonics. We show that temporal and spatial coherence reach maximum close to the FEL saturation but may degrade significantly in the post-saturation regime. We also find that the pointing stability of short FEL pulses is limited due to the fact that non-azimuthal FEL eigenmodes are not sufficiently suppressed. We discuss possible ways for improving the degree of transverse coherence and the pointing stability.
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