基于针尖的30keV飞秒电子脉冲源
A tip-based source of femtosecond electron pulses at 30keV
摘要：
我们提出了一个纳米级的光电子源，优化超短脉冲持续时间和时间分辨衍射实验非常适合。安装在抑制器提取器电极配置中的钨尖端允许在枪出口处产生30 keV的电子脉冲，估计脉冲持续时间为37 fs。我们推断的脉冲持续时间从粒子跟踪模拟，这是在良好的协议与实验测量的电子光学特性的源。我们还展示了飞秒激光触发操作。除了短的电子脉冲持续时间，尖端为基础的源预计将具有大的横向相干性，以及纳米发射度。
英文摘要：
We present a nano-scale photoelectron source, optimized towards ultrashort pulse durations and well-suited for time-resolved diffraction experiments. A tungsten tip, mounted in a suppressor-extractor electrode configuration, allows the generation of 30 keV electron pulses with an estimated pulse duration of 37 fs at the gun exit. We infer the pulse duration from particle tracking simulations, which are in excellent agreement with experimental measurements of the electron-optical properties of the source. We furthermore demonstrate femtosecond laser-triggered operation. Besides the short electron pulse duration, a tip-based source is expected to feature a large transverse coherence as well as a nanometric emittance.
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