Experimental demonstration of fresh bunch self-seeding in an X-ray free electron laser
Experimental demonstration of fresh bunch self-seeding in an X-ray free electron laser
复制标题
DOI：
10.1063/1.4980092
复制
发表时间：
2017-04-10
影响因子：
4
通讯作者：
Pellegrini, C.
中科院分区：
文献类型：
--
作者：
Emma, C.;Lutman, A.;Pellegrini, C.
本文报道了在x射线自由电子激光器（XFEL）中使用新鲜束自播种（FBSS）方法产生超高亮度x射线脉冲。FBSS方法使用两个不同的电子片或束，一个产生种子，另一个在单色仪后放大它。该方法避免了常规自种子FELs在种子功率和电子片能量扩散之间的权衡，从而限制了其效率。实验证明了FBSS的可行性，产生了长9fs、带宽7.3 x 10（-5）、功率50GW的5.5 keV光子脉冲。将FBSS性能与自放大自发发射/自播种性能进行了比较，测量亮度分别增加了12 / 2倍。在优化的XFEL中，FBSS可以将峰值功率提高100倍，达到多tw，为非线性科学和单分子成像开辟了新的研究领域。AIP出版社出版。
We report the generation of ultrahigh brightness X-ray pulses using the Fresh Bunch Self-Seeding (FBSS) method in an X-ray Free Electron Laser (XFEL). The FBSS method uses two different electron slices or bunches, one to generate the seed and the other to amplify it after the monochromator. This method circumvents the trade-off between the seed power and electron slice energy spread, which limits the efficiency of regular self-seeded FELs. The experiment, the performance of which is limited by existing hardware, shows FBSS feasibility, generating 5.5 keV photon pulses which are 9 fs long and of 7.3 x 10(-5) bandwidth and 50GW power. FBSS performance is compared with Self Amplified Spontaneous Emission/self-seeding performance, measuring a brightness increase of twelve/two times, respectively. In an optimized XFEL, FBSS can increase the peak power a hundred times more than state-of-the-art to multi-TW, opening new research areas for nonlinear science and single molecule imaging. Published by AIP Publishing.