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Cascaded Multicycle Terahertz-Driven Ultrafast Electron Acceleration and Manipulation
Physical Review X ( IF 12.5 ) Pub Date : 2020-03-19 , DOI: 10.1103/physrevx.10.011067
Dongfang Zhang , Moein Fakhari , Huseyin Cankaya , Anne-Laure Calendron , Nicholas H. Matlis , Franz X. Kärtner

Terahertz (THz)-based electron acceleration and manipulation has recently been shown to be feasible and to hold tremendous promise as a technology for the development of next-generation, compact electron sources. Previous work has concentrated on structures powered transversely by short, single-cycle THz pulses, with millimeter-scale, segmented interaction regions that are ideal for acceleration of electrons in the sub- to few-MeV range, where electron velocities vary significantly. However, in order to extend this technology to the multi-MeV range, an investigation of approaches supporting longer interaction lengths is needed. Here, we demonstrate first steps in electron acceleration and manipulation using dielectrically lined waveguides powered by temporally long, narrow-band, multicycle THz pulses that copropagate with the electrons. This geometry offers centimeter-scale single-stage interaction lengths and offers the opportunity to further increase interaction lengths by cascading acceleration stages that recycle the THz energy and rephase the interaction. We prove the feasibility of THz-energy recycling for the first time by demonstrating acceleration, compression, and focusing in two sequential Al2O3-based dielectric capillary stages powered by the same multicycle THz pulse. Since the multicycle THz energy achievable using laser-based sources is currently a limiting factor for the maximum electron acceleration, recycling the THz pulses provides a key factor for reaching relativistic energies with existing sources and paves the way for applications in future ultrafast electron diffraction and free-electron lasers.

中文翻译:

级联多周期太赫兹驱动的超快电子加速和操纵

最近,基于太赫兹(THz)的电子加速和操纵已被证明是可行的,并且作为开发下一代紧凑型电子源的技术具有广阔的前景。先前的工作集中在由短单周期THz脉冲横向供电的结构上,该结构具有毫米级的分段相互作用区域,非常适合在电子速度显着变化的亚MeV至MeV范围内加速电子。但是,为了将该技术扩展到多MeV范围,需要研究支持更长的交互长度的方法。在这里,我们演示了使用介电衬里的波导进行电子加速和操纵的第一步,该波导由与电子共传播的时间较长,窄带,多周期THz脉冲供电。这种几何形状提供了厘米级的单级交互作用长度,并提供了通过级联加速阶段来进一步增加交互作用长度的机会,这些加速阶段可回收THz能量并重新定相。我们通过演示加速,压缩并集中在两个顺序上来首次证明太赫兹能量回收的可行性2Ø3相同的多周期THz脉冲驱动的基于介电的毛细管级。由于目前使用基于激光的光源可获得的多周期太赫兹能量是最大电子加速度的限制因素,因此,对太赫兹脉冲进行回收利用是利用现有光源达到相对论能量的关键因素,并为以后的超快电子衍射和自由应用铺平了道路。电子激光器。
更新日期:2020-03-19
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