标题： 基于射频和太赫兹技术的潜在混合紧凑阿秒X射线源的仿真 显示英文标题

标题： Simulations on a potential hybrid and compact attosecond X-ray source based on RF and THz technologies

摘要： 我们通过束流动力学仿真研究了混合布局结合射频和太赫兹技术作为基于逆康普顿散射(ICS)的紧凑X射线源的潜力，可产生几飞秒到亚飞秒脉冲。该布局包括一个S波段枪作为电子源，以及由多周期太赫兹脉冲驱动的介质加载圆形波导，用于加速和纵向压缩束团，然后将该束团与红外激光脉冲通过ICS产生X射线脉冲。我们进行的束流动力学仿真，从光电阴极到ICS点，使我们能够深入了解所提出方案中的几个重要物理效应，以及加速和横向聚焦装置的各种参数对可实现束团特性的影响。本文 presented 的研究得出了一种初步布局和一组参数，根据我们的仿真，在ICS点可以实现超短束团（约1 fs均方根），能量为15 MeV，电荷至少为1 pC，并且横向聚焦到约10微米均方根或以下，同时保持紧凑的束流线（小于1.5米），这尚未仅使用传统射频技术实现。未来的研究将致力于研究几种可能的方法来改善所实现的束团特性，克服当前研究中确定的限制，并定义技术要求。这将导致更新后的布局和参数集。 显示英文摘要

摘要： We investigate through beam dynamics simulations the potential of a hybrid layout mixing RF and THz technologies to be a compact X-ray source based on Inverse Compton Scattering (ICS), delivering few femtoseconds to sub-femtosecond pulses. The layout consists of an S-band gun as electron source and a dielectric-loaded circular waveguide driven by a multicycle THz pulse to accelerate and longitudinally compress the bunch, which will then be used to produce X-ray pulses via ICS with an infrared laser pulse. The beam dynamics simulations we performed, from the photocathode up to the ICS point, allows to have an insight in several important physical effects for the proposed scheme and also in the influence on the achievable bunch properties of various parameters of the accelerating and transverse focusing devices. The study presented in this paper leads to a preliminary layout and set of parameters able to deliver at the ICS point, according to our simulations, ultrashort bunches (around 1 fs rms), at 15 MeV, with at least 1 pC charge and transversely focused down to around 10 um rms or below while keeping a compact beamline (less than 1.5 m), which has not yet been achieved using only conventional RF technologies. Future studies will be devoted to the investigation of several potential ways to improve the achieved bunch properties, to overcome the limitations identified in the current study and to the definition of the technical requirements. This will lead to an updated layout and set of parameters.