Exploring and controlling helium nanoplasmas in new regimes

该项目扩展了以前成功的实验，探测掺杂剂诱导的氦（He）纳米等离子体的动力学到两个方向。一方面，He纳米等离子体将在新的光-物质相互作用机制和新的诊断方法中进行探索。氦纳米等离子体动力学诱导强烈的中红外以及极紫外脉冲将探测使用相关单次电子成像光谱和离子质谱。另一方面，我们将采取控制的He纳米等离子体到一个极端的大小选择的He液滴和强度过滤的激光脉冲。相位控制和偏振成形双色激光场的应用将阐明从定制的纳米等离子体系统控制电子和离子发射的潜力和局限性。这些研究有助于设计基于激光的粒子加速的新策略，并用于评估基于自由电子激光的衍射成像中发生的辐射损伤。

This project extends the previous successful experiments that probe the dynamics of dopant-induced helium (He) nanoplasmas into two directions. On the one hand, He nanoplasmas will be explored in new regimes of light-matter interaction and with new diagnostic methods. He nanoplasma dynamics induced by intense mid-infrared as well as extreme ultraviolet pulses will be probed using correlated single-shot electron imaging spectroscopy and ion mass spectrometry. On the other hand, we will take the control of He nanoplasmas to an extreme by size-selecting the He droplets and by intensity filtering the laser pulses. The application of phase-controlled and polarization-shaped bichromatic laser fields will elucidate the potential and the limitations of controlling electron and ion emission from tailored nanoplasmonic systems. These studies are instrumental for devising novel strategies for laser-based particle acceleration and for assessing radiation damage occurring in free-electron laser-based diffraction imaging.