arXiv 2302.069822023-02-20physics.acc-ph

FemtoTrack：少电子超短束团的空间电荷跟踪工具

FemtoTrack: A space-charge tracking tool for few-electron ultrashort bunches

Jan Lautenschläger, Uwe Niedermayer

备注：: Corrected typos and changed figure placement

摘要：

超快电子实验通常采用低发射度的少电子脉冲束。这些结构通常比（平均）电子脉冲尺寸大得多，这对模拟的分辨率提出了挑战。我们提出了跟踪代码FemtoTrack，它允许以简单的方式解决这些多尺度的挑战。计算上最重的插值的字段是由移动窗口或补充网格，导致显着的加速处理。空间电荷通过每个聚束内的直接粒子-粒子相互作用来处理，然而，可以在同一窗口中同时模拟多个聚束。这允许获得类似于在实验中在屏幕上获得的统计数据。FemtoTrack应用于两个示例：超快纳米尖端电子源和微芯片上长度可扩展的激光驱动电子加速器。在这些设置中，以前的结果已经以巨大的加速再现，允许类似于实验调谐的参数扫描。

英文摘要：

Ultrafast electron experiments usually work with low-emittance few-electron pulsed beams. The structures are usually much larger than the (average) electron pulse size posing challenges to the resolution of simulations. We present the tracking code FemtoTrack, which allows tackling these multi-scale challenges in a simple manner. The computationally most heavy interpolation of the fields is treated either by a moving window or by a supplemental grid, leading to a significant speedup. Space charge is treated by direct particle-particle interaction within each bunch, where however many bunches can be simulated in the same window simultaneously. This allows to obtain statistics similar to what is obtained on the screen in an experiment. FemtoTrack is applied to two examples: An ultrafast nanotip electron source and a length scalable laser-driven electron accelerator on a microchip. In these setups, previous results have been reproduced with tremendous speedup, allowing for parameter scans similar to the tuning of an experiment.

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英文摘要：

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