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Laser-ablation-based ion source characterization and manipulation for laser-driven ion acceleration

机译：基于激光烧蚀的离子源表征和用于激光驱动离子加速的操纵

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摘要

For laser-driven ion acceleration from thin foils (similar to 10 mu m-100 nm) in the target normal sheath acceleration regime, the hydro-carbon contaminant layer at the target surface generally serves as the ion source and hence determines the accelerated ion species, i.e. mainly protons, carbon and oxygen ions. The specific characteristics of the source layer-thickness and relevant lateral extent-as well as its manipulation have both been investigated since the first experiments on laser-driven ion acceleration using a variety of techniques from direct source imaging to knife-edge or mesh imaging. In this publication, we present an experimental study in which laser ablation in two fluence regimes (low: F similar to 0.6 J cm(-2), high: F similar to 4 J cm(-2)) was applied to characterize and manipulate the hydro-carbon source layer. The high-fluence ablation in combination with a timed laser pulse for particle acceleration allowed for an estimation of the relevant source layer thickness for proton acceleration. Moreover, from these data and independently from the low-fluence regime, the lateral extent of the ion source layer became accessible.
机译：对于从薄箔（类似于10μm-100nm）的激光驱动离子加速度在目标正常鞘加速度调节中，靶表面处的氢碳污染物层通常用作离子源，因此确定加速的离子物种，即主要是质子，碳和氧离子。源层厚度和相关横向范围的具体特征以及其操纵均研究了通过从直接源成像到刀刃或网格成像的各种技术的激光驱动离子加速度的第一实验。在本出版物中，我们介绍了一种实验研究，其中两个注速器的激光消融（类似于0.6J厘米（-2）的低：F，类似于4J厘米（-2））的特征和操纵水碳源层。高流速消融与定时激光脉冲组合用于粒子加速度，允许估计质子加速的相关源层厚度。此外，从这些数据和独立于低流量的状态，离子源层的横向范围变得可访问。

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