Optical fiber-driven low energy electron gun for ultrafast streak diffraction
Optical fiber-driven low energy electron gun for ultrafast streak diffraction
复制标题
用于超快条纹衍射的光纤驱动低能电子枪
DOI：
10.1063/1.5039737
复制
发表时间：
2018
影响因子：
4
通讯作者：
R. Miller
中科院分区：
文献类型：
--
作者：
Chiwon Lee;G. Kassier;R. Miller
在这里，我们提出了一种基于光纤的电子枪设计的超快拖尾的低能电子束。几十个皮秒长的电子聚束组成的200个电子的时间分布的特点是使用定制的条纹相机。详细分析表明，由于波导内的色散效应，光触发脉冲的展宽决定了低密度电子聚束的时间长度。这一结果表明，通过调整光纤光源的几何参数和耦合条件，可以控制条纹衍射实验中的可观测时间窗口。利用集成在基于纤维的阴极上的静电Einzel透镜系统，我们还展示了RMS光斑尺寸为98 μm的电子束的空间聚焦以及在1.0-2.0 keV的电子动能范围内单层石墨烯的静态低能电子衍射图案的成像。我们提出了一种基于光纤的电子枪，该电子枪被设计用于低能电子束的超快拖尾。几十个皮秒长的电子聚束组成的200个电子的时间分布的特点是使用定制的条纹相机。详细分析表明，由于波导内的色散效应，光触发脉冲的展宽决定了低密度电子聚束的时间长度。这一结果表明，通过调整光纤光源的几何参数和耦合条件，可以控制条纹衍射实验中的可观测时间窗口。利用静电单透镜透镜系统集成在光纤阴极上，我们还演示了电子束的空间聚焦。
Here, we present an optical fiber-based electron gun designed for the ultrafast streaking of low-energy electron bunches. The temporal profile of the few tens of the picosecond long electron bunch composed of 200 electrons is well characterized using a customized streak camera. Detailed analysis reveals that the stretched optical trigger pulse owing to the dispersion effects inside the waveguide dominantly determines the temporal length of the low density electron bunch. This result illustrates the capability to control the observable time-window in the streak diffraction experiment by tailoring geometrical parameters of the fiber source and its coupling condition. With the electrostatic Einzel lens system integrated on the fiber-based cathode, we also demonstrate spatial focusing of the electron beam with the RMS spot size of 98 μm and imaging of the static low-energy electron diffraction pattern of monolayer graphene in the electron kinetic energy range of 1.0–2.0 keV.Here, we present an optical fiber-based electron gun designed for the ultrafast streaking of low-energy electron bunches. The temporal profile of the few tens of the picosecond long electron bunch composed of 200 electrons is well characterized using a customized streak camera. Detailed analysis reveals that the stretched optical trigger pulse owing to the dispersion effects inside the waveguide dominantly determines the temporal length of the low density electron bunch. This result illustrates the capability to control the observable time-window in the streak diffraction experiment by tailoring geometrical parameters of the fiber source and its coupling condition. With the electrostatic Einzel lens system integrated on the fiber-based cathode, we also demonstrate spatial focusing of the electron beam with th...
影响因子：
56.9
作者：
Ishikawa, Tadahiko;Hayes, Stuart A.;Miller, R. J. Dwayne
通讯作者：
Miller, R. J. Dwayne