太赫兹和光学范围内相对论性束箔相互作用的相干跃迁辐射
Coherent Transition Radiation from Relativistic Beam-Foil Interaction in the Terahertz and Optical Range
摘要：
利用二维粒子模拟方法研究了相对论电子束与过密等离子体箔相互作用产生的相干渡越辐射。定义明确的单电子束均匀的轮廓或具有子结构被认为是各种束等离子体参数。其主要目的是模拟复杂的光束等离子体条件，经常发现，例如，在强烈的激光等离子体相互作用。CTR的时间，角度和光谱分布的关键属性进行了识别。几个饱和效应，由于光束能量，尺寸和箔密度被发现的CTR能量，和不同的光谱成分，如在太赫兹（THz）和光学范围的依赖性不同。详细的子结构的光束也影响很大的辐射产生，导致独特的高次谐波分量。探索了电子的动能从亚MeV到几十GeV。对于少数MeV的电子束，箔等离子体对束动力学和相关CTR生成的影响，类似于从强烈的激光-等离子体相互作用中产生的热电子的CTR。这些结果可能会发现重要的应用在光束诊断无论是在激光等离子体加速或传统的加速器。它们也可以用来设计使用可调谐电子束的新型THz辐射源。
英文摘要：
Coherent transition radiation (CTR) from relativistic electron beam interaction with an overdense plasma foil is investigated by making use of two-dimensional particle-in-cell simulations. Well-defined single electron beam either of uniform profile or having substructures is considered for various beam-plasma parameters. The main purpose is to mimic the complicated beam-plasma conditions that is often found, for example, in intense laser plasma interactions. Key properties of the CTR concerning their temporal, angular and spectral profiles are identified. Several saturation effects due to the beam energy, size and foil density are found for the CTR energy, and the dependences vary for different spectral components such as in the Terahertz (THz) and optical range. The detailed substructure of the beam also affects greatly the radiation generation, leading to distinctive high harmonic components. Electrons with kinetic energy from sub MeV to tens of GeV are explored. For few MeV electron beams, the effects of the foil plasma on the beam dynamics and associated CTR generation, resembles closely the CTR from hot electrons produced in intense laser-plasma interactions. These results may find important applications in beam diagnostics either in laser-plasma based acceleration or conventional accelerators. They may also be employed to design novel THz radiation sources using tunable electron beams.
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