Experimental demonstration of fresh bunch self-seeding in an X-ray free electron laser

被引：45

作者：

Emma, C. ^{[1
]}

Lutman, A. ^{[2
]}

Guetg, M. W. ^{[2
]}

Krzywinski, J. ^{[2
]}

Marinelli, A. ^{[2
]}

Wu, J. ^{[2
]}

Pellegrini, C. ^{[1
,2
]}

机构：

[1] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[2] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

APPLIED PHYSICS LETTERS | 2017年 / 110卷 / 15期

关键词：

EXTREME-ULTRAVIOLET; SASE FEL; COHERENT; PULSES; SCATTERING; BANDWIDTH;

D O I：

10.1063/1.4980092

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

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