用于水合样品的泵-探针XFEL粒子注入器
A pump-probe XFEL particle injector for hydrated samples
摘要：
我们已经开发了一种液体喷射注射器系统，可用于在X射线自由电子激光（XFEL）源和第三代同步加速器源的水合样品输送。该喷射器基于气体动力学虚拟喷嘴（GDVN），可产生直径从300 nm到20 μm的液体射流，而不会出现传统Rayleigh射流的堵塞问题。本文提出了一种改进的喷管设计。差动泵系统保护真空室，真空显微镜允许在液体射流暴露于X射线束时观察液体射流以进行诊断。一个光纤光耦合泵浦激光器照明射流被纳入泵浦探测实验。在LCLS上已经获得了使用这种喷射器系统的第一批结果。
英文摘要：
We have developed a liquid jet injector system that can be used for hydrated sample delivery at X-ray Free Electron Laser (XFEL) sources and 3rd generation synchrotron sources. The injector is based on the Gas Dynamic Virtual Nozzle (GDVN), which generates a liquid jet with diameter ranging from 300 nm to 20 μm without the clogging problems associated with conventional Rayleigh jets. An improved nozzle design is presented here. A differential pumping system protects the vacuum chamber and an in-vacuum microscope allows observation of the liquid jet for diagnostics while it is being exposed to the X-ray beam. A fiber optically coupled pump laser illuminating the jet is incorporated for pump-probe experiments. First results with this injector system have been obtained at the LCLS.
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