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首页> 外文期刊>Physical Review X >Transverse Space-Charge Field-Induced Plasma Dynamics for Ultraintense Electron-Beam Characterization
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Transverse Space-Charge Field-Induced Plasma Dynamics for Ultraintense Electron-Beam Characterization

机译：横向空穴场诱导的超空光束表征等离子体动力学

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Similarly to laser or x-ray beams, the interaction of sufficiently intense particle beams with neutral gases will result in the creation of plasma. In contrast to photon-based ionization, the strong unipolar field of a particle beam can generate a plasma where the electron population receives a large initial momentum kick and escapes, leaving behind unshielded ions. Measuring the properties of the ensuing Coulomb exploding ions—such as their kinetic energy distribution, yield, and spatial distribution—can provide information about the peak electric fields that are achieved in the electron beams. Particle-in-cell simulations and analytical models are presented for high-brightness electron beams of a few femtoseconds or even hundreds of attoseconds, and transverse beam sizes on the micron scale, as generated by today’s free electron lasers. Different density regimes for the utilization as a potential diagnostics are explored, and the fundamental differences in plasma dynamical behavior for e-beam or photon-based ionization are highlighted. By measuring the dynamics of field-induced ions for different gas and beam densities, a lower bound on the beam charge density can be obtained in a single shot and in a noninvasive way. The exponential dependency of the ionization yield on the beam properties can provide unprecedented spatial and temporal resolution, at the submicrometer and subfemtosecond scales, respectively, offering a practical and powerful approach to characterizing beams from accelerators at the frontiers of performance.
机译：类似于激光或X射线束，具有中性气体的充分强烈粒子束的相互作用将导致血浆的产生。与基于光子的电离相比，粒子束的强单极场可以产生等离子体，其中电子人群接收大的初始动量踢腿和逃逸，留下未屏蔽的离子。测量随后的库仑爆炸离子的性质 - 例如它们的动能分布，产量和空间分布 - 可以提供关于在电子束中实现的峰值电场的信息。粒子细胞模拟和分析模型用于一些飞秒甚至数百个阳离子的高亮度电子束，以及微米刻度上的横梁尺寸，由当今的游离电子激光器产生。探讨了利用作为潜在诊断的不同密度制度，并突出了电子束或基于光子电离的等离子体动力学行为的根本差异。通过测量用于不同气体和光束密度的场诱导的离子的动态，可以在单一的射击和非侵入方式中获得梁充电密度的下限。电离产量对光束性能的指数依赖性可以分别在潜置尺度计和子交叉秒的尺度上提供前所未有的空间和时间分辨率，提供了一种实用而强大的方法，以表征来自性能前沿的加速器的光束。

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