We describe a compact, reliable, and high-average-power femtosecond x-ray source and its first application to diffraction on protein crystal. The setup relies on a homemade Ti: sapphire system delivering 12 mJ at a 1 kHz repetition rate, associated with a small vacuum chamber especially designed for laser-plasma interaction and x-ray applications. This device allows the generation of 5 X 10~(9) photons/s/sr at 8 keV and optimized x-ray irradiation of the studied sample, which can be placed close to the source. We present the diffraction pattern of a protein crystal in a divergent beam geometry, which is a first step to a subpicosecond x-ray diffraction experiment.
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机译：我们描述了一种紧凑，可靠和高平均功率的飞秒X射线源及其在蛋白质晶体衍射上的首次应用。该设置依靠自制的Ti：蓝宝石系统以1 kHz的重复频率提供12 mJ的功率，并配有专门为激光-等离子体相互作用和X射线应用设计的小型真空室。该装置允许在8 keV处产生5 X 10〜（9）光子/ s / sr，并优化了研究样品的X射线辐射，可以将其放置在靠近光源的位置。我们介绍了发散束几何中的蛋白质晶体的衍射图样，这是亚皮秒X射线衍射实验的第一步。
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