FemtoTrack: A space-charge tracking tool for few-electron ultrashort bunches
Jan Lautenschl\"ager, Uwe Niedermayer

TL;DR
FemtoTrack is a fast, multi-scale simulation tool for low-emittance, few-electron ultrashort bunches, enabling efficient modeling of space charge effects and complex experimental setups.
Contribution
It introduces FemtoTrack, a novel space-charge tracking code that significantly speeds up simulations of ultrashort electron bunches with multi-scale challenges.
Findings
Reproduces previous results with high speed
Enables extensive parameter scans
Handles multiple bunches simultaneously
Abstract
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…
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Taxonomy
TopicsParticle Accelerators and Free-Electron Lasers · Gyrotron and Vacuum Electronics Research · Particle accelerators and beam dynamics
