基于RF和THz技术的混合紧凑型阿秒X射线源的模拟
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模拟研究了混合RF和THz技术的混合布局成为基于逆康普顿散射（ICS）的紧凑型X射线源的潜力，提供几个飞秒到亚飞秒脉冲。该布局由一个S波段电子枪作为电子源和一个介质加载的圆波导由一个多倍频太赫兹脉冲驱动，以加速和纵向压缩聚束，然后将用于产生X射线脉冲通过ICS与红外激光脉冲。我们进行的束流动力学模拟，从光阴极到ICS点，允许有几个重要的物理效应的建议计划的洞察力，也在可实现的聚束性能的各种参数的加速和横向聚焦设备的影响。本文提出的研究导致了一个初步的布局和一组参数，能够提供在ICS点，根据我们的模拟，超短束（约1 fs rms），15 MeV，至少1 pC电荷，横向聚焦到约10 um rms或更低，同时保持紧凑的光束线（小于1.5米），这还没有实现仅使用传统的RF技术。未来的研究将致力于调查的几种潜在的方法来提高所实现的聚束性能，克服在目前的研究中确定的限制和技术要求的定义。这将导致更新的布局和参数集。
英文摘要：
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.
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