Exploring and controlling helium nanoplasmas in new regimes

这个项目将之前成功的探索掺杂诱导的氦(He)纳米等离子体动力学的实验扩展到两个方向。一方面，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得到探索。我们将利用相关单次电子成像光谱和离子质谱仪来研究强中红外和极紫外光脉冲诱导的纳米等离子体动力学。另一方面，我们将通过选择He液滴的大小和对激光脉冲进行强度过滤，将对He纳米等离子体的控制发挥到极致。相位控制和偏振形状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，以及评估基于自由电子激光的衍射成像中发生的辐射损害。

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.