充气毛细管中外流引起的等离子体斜坡
Plasma ramps caused by outflow in gas-filled capillaries
摘要：
毛细管内的等离子体约束在过去几年中已经被开发用于基于等离子体的加速，以确保在与粒子或激光束相互作用期间稳定且可重复的等离子体密度分布。特别地，充气毛细管允许沿着与颗粒的相互作用的稳定且几乎可预测的等离子体分布。然而，通过毛细管的端部喷射的等离子体在内部等离子体之前与射束相互作用，从而影响射束的质量。在这篇文章中，我们报告的等离子体流的演变的测量在两端的1cm长，1 mm直径的毛细管充满氢。特别地，我们测量了毛细管外等离子体的纵向密度分布和膨胀速度。这项研究将允许更好地了解未来的等离子体为基础的实验的束-等离子体相互作用。
英文摘要：
Plasma confinement inside capillaries has been developed in the past years for plasma-based acceleration to ensure a stable and repeatable plasma density distribution during the interaction with either particles or laser beams. In particular, gas-filled capillaries allow a stable and almost predictable plasma distribution along the interaction with the particles. However, the plasma ejected through the ends of the capillary interacts with the beam before the inner plasma, affecting the quality of the beam. In this article we report the measurements on the evolution of the plasma flow at the two ends of a 1 cm long, 1 mm diameter capillary filled with hydrogen. In particular, we measured the longitudinal density distribution and the expansion velocity of the plasma outside the capillary. This study will allow a better understanding of the beam-plasma interaction for future plasma-based experiments.
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