Aballe Lucia, Foerster Michael, Cabrejo Meritxell, Prat Jordi, Pittana Paolo, Sergo Rudi, Lucian Matteo, Barnaba Maurizio, Menteş Tevfik Onur, Locatelli Andrea
ALBA Synchrotron, Carrer de la llum 2-26, 08290 Cerdanyola del Valles, Spain.
ALBA Synchrotron, Carrer de la llum 2-26, 08290 Cerdanyola del Valles, Spain.
Ultramicroscopy. 2019 Jul;202:10-17. doi: 10.1016/j.ultramic.2019.03.011. Epub 2019 Mar 19.
We report on a simple and cost-effective device for high-speed gating in photoemission electron microscopy (PEEM) with pulsed photon sources. This device is based on miniaturized electrode plates, which deflect the photoelectron beam inside the imaging column of the microscope so that it is either accepted or blocked in its path towards the detector. The gating device is optimized for installation on the Elmitec SPELEEM III microscope. Due to the compact design, it can be driven by voltage pulses of low amplitude (few volts), delivered by commercially available signal generators. Most notably, our device allows for stroboscopic data collection with on-time of less than 10 ns and at a rate in the range from 1 MHz to 250 MHz, making it suitable for usage in both hybrid and standard multi-bunch operation of the synchrotron ring. We demonstrate applications of pump-probe imaging at high lateral resolution, namely magnetic imaging and PEEM imaging of surface acoustic waves.
我们报道了一种用于在具有脉冲光子源的光发射电子显微镜（PEEM）中进行高速选通的简单且经济高效的装置。该装置基于小型化电极板，这些电极板使显微镜成像柱内的光电子束发生偏转，从而使其在朝向探测器的路径中要么被接收要么被阻挡。该选通装置针对安装在Elmitec SPELEEM III显微镜上进行了优化。由于设计紧凑，它可以由市售信号发生器提供的低幅度（几伏）电压脉冲驱动。最值得注意的是，我们的装置允许进行频闪数据采集，开启时间小于10纳秒，速率范围为1兆赫兹至250兆赫兹，使其适用于同步加速器环的混合和标准多束运行。我们展示了高横向分辨率泵浦 - 探测成像的应用，即表面声波的磁成像和PEEM成像。
