MaRIE XFEL第一束流压气机常规与双C型弯道方案的比较研究
Comparison study on first bunch compressor schemes by conventional and double C-chicane for MaRIE XFEL
摘要：
我们报告了我们的比较研究的第一阶段电子束压缩计划在750 MeV的X射线自由电子激光（XFEL）正在开发中的物质辐射相互作用在极端（MARIE）项目在洛斯阿拉莫斯国家实验室使用传统的和双C-弯道。与传统的C-回旋束压缩器相比，双C-回旋方案利用相干同步辐射（CSR）在第二个C-回旋中产生的横向动量位移来补偿第一个C-回旋中产生的横向动量位移，从而使压缩后的电子束具有最小的横向动量.研究还发现，双C-曲线方案可以被设计成在聚束压缩过程中更好地保持束流发射度。这对于MaRIE XFEL特别有利，其激光性能关键取决于超低束流发射度的保持。
英文摘要：
We report our comparison study on the first stage electron bunch compression schemes at 750 MeV using a conventional and a double C-chicane for the X-ray free electron laser (XFEL) under development for the Matter-Radiation Interactions in Extremes (MaRIE) project at Los Alamos National Laboratory. Compared to the performance of the conventional C-chicane bunch compressor, the double C-chicane scheme exhibits the capability of utilizing the transverse momentum shift induced by the coherent synchrotron radiation (CSR) in the second C-chicane to compensate that generated in the first C-chicane, resulting in a compressed electron bunch with minimized transverse momentum along the beam. It is also found that the double C-chicane scheme can be designed to significantly better preserve the beam emittance in the course of the bunch compression. This is particularly beneficial for the MaRIE XFEL whose lasing performance critically depends on the preservation of the ultralow beam emittance.
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