Temporal evolution of the light emitted by a thin, laser-ionized plasma source
Temporal evolution of the light emitted by a thin, laser-ionized plasma source
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DOI：
10.1063/5.0180416
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发表时间：
2024-01
影响因子：
2.2
通讯作者：
V. Lee;R. Ariniello;C. Doss;Kathryn Wolfinger;P. Stoltz;C. Hansel;Spencer Gessner;John Cary-John-Ca
中科院分区：
文献类型：
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作者：
V. Lee;R. Ariniello;C. Doss;Kathryn Wolfinger;P. Stoltz;C. Hansel;Spencer Gessner;John Cary-John-Ca
我们提出了一个实验和模拟为基础的调查从薄，激光电离氦等离子体源的光发射的时间演变。我们展示了一个解析模型来计算的近似缩放的时间积分，轴上的光发射与初始等离子体密度和温度，实验的支持，这提高了等离子体光测量等离子体韦克菲尔德加速器（PWFA）等离子体源的理解。我们的模型模拟等离子体密度和温度使用分步傅立叶代码和粒子在细胞的代码。然后，使用流体模拟来模拟等离子体和中性密度，以及作为时间和位置的函数的电子温度。然后，我们显示的空间和时间分辨的光发射的数值结果，碰撞激发是光发射的主要来源。我们通过测量激光电离等离子体发射的光来验证我们的模型，该激光电离等离子体发射的光使用一种新颖的统计方法，该方法能够使用具有微秒级定时抖动的具有成本效益的相机来解决等离子体光的纳秒级时间动态。这种方法非常适合在粒子加速器的高辐射环境中部署，从而避免使用昂贵的纳秒门控相机。我们的结果表明，我们的模型可以有效地模拟薄，激光电离等离子体源的动力学。此外，这项工作提供了一个详细的了解等离子体光测量，这是为数不多的诊断信号可用于PWFA等离子体源的直接测量。
We present an experimental and simulation-based investigation of the temporal evolution of light emission from a thin, laser-ionized helium plasma source. We demonstrate an analytic model to calculate the approximate scaling of the time-integrated, on-axis light emission with the initial plasma density and temperature, supported by the experiment, which enhances the understanding of plasma light measurement for plasma wakefield accelerator (PWFA) plasma sources. Our model simulates the plasma density and temperature using a split-step Fourier code and a particle-in-cell code. A fluid simulation is then used to model the plasma and neutral density, and the electron temperature as a function of time and position. We then show the numerical results of the space-and-time-resolved light emission and that collisional excitation is the dominant source of light emission. We validate our model by measuring the light emitted by a laser-ionized plasma using a novel statistical method capable of resolving the nanosecond-scale temporal dynamics of the plasma light using a cost-effective camera with microsecond-scale timing jitter. This method is ideal for deployment in the high radiation environment of a particle accelerator that precludes the use of expensive nanosecond-gated cameras. Our results show that our models can effectively simulate the dynamics of a thin, laser-ionized plasma source. In addition, this work provides a detailed understanding of the plasma light measurement, which is one of the few diagnostic signals available for the direct measurement of PWFA plasma sources.