论文标题
关于使用X射线免费电子激光器的多层LAUE镜头
On the use of multilayer Laue lenses with X-ray Free Electron Lasers
论文作者
论文摘要
多层LAUE透镜首次使用X射线免费电子激光器（XFEL）聚焦X射线。在欧洲XFEL进行的实验中，我们证明了聚焦到几十纳米的斑点大小。一系列运行，每列火车的脉冲数量从1到2、3、4、5、6、7、10、20、20和30脉冲，使用相同的镜头进行了脉冲分离，脉冲分离为3.55。每列火车脉冲数量的增加伴随着X射线强度（传输）从9％增加到92％，当时每列5个脉冲，然后当脉冲进一步增加时将传播降低到23.5％。最终的工作条件是每列火车30脉冲和23.5％的传播。只有在这种情况下，我们才看到MLL的衍射效率在脉冲列车的过程中发生了变化，并且这种变化可以从火车到火车之间重现。我们介绍了对齐和表征这些镜头的过程，并讨论了与此独特X射线源的脉冲列车一起工作的挑战。
Multilayer Laue lenses were used for the first time to focus x-rays from an X-ray Free Electron Laser (XFEL). In an experiment, which was performed at the European XFEL, we demonstrated focusing to a spot size of a few tens of nanometers. A series of runs in which the number of pulses per train was increased from 1 to 2, 3, 4, 5, 6, 7, 10, 20 and 30 pulses per train, all with a pulse separation of 3.55 us, was done using the same set of lenses. The increase in the number of pulses per train was accompanied with an increase of x-ray intensity (transmission) from 9% to 92% at 5 pulses per train, and then the transmission was reduced to 23.5 % when the pulses were increased further. The final working condition was 30 pulses per train and 23.5% transmission. Only at this condition we saw that the diffraction efficiency of the MLLs changed over the course of a pulse train, and this variation was reproducible from train to train. We present the procedure to align and characterize these lenses and discuss challenges working with the pulse trains from this unique x-ray source.
