Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.100: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal

Numerical studies of electron pulse broadening in laser-triggered sources — •Johannes Illmer, Joshua McNeur, Martin Kozák, Norbert Schönenberger, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen

In the field of ultrafast physics, femtosecond electron pulses have proven to be a useful tool to study ultrafast phenomena in condensed matter systems [1]. One way of generating these short electron pulses is the laser-triggering of an electron source, designed for DC beams, with femtosecond UV laser pulses. Due to effects such as space charge, trajectory differences and dispersion in vacuum, the initial temporal profile of the electron pulses becomes broadened, limiting the achievable resolution. We present numerical studies of this effect in order to investigate the pulse broadening behavior of laser-triggered electron sources. The electrostatic fields of the electron gun are calculated with a Poissonian field solver. Trajectory and space charge effects are calculated via a 5th order Runge-Kutta algorithm. A first validation of this method was shown by correlating experimental results with a numerical study of the electron pulse broadening. Furthermore, we discuss investigations of new source configurations to identify setups that minimize such broadening. A special focus is the development of new source types for application in dielectric laser accelerators (DLA)[2].

[1] A. H. Zewail and J. M. Thomas, "4D Electron Microscopy: Imaging in Space and Time", Imperial College Press (2010)

[2] R. Joel England et al., Rev. Mod. Phys. 86, 1337 (2014)