SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 20: Laser Plasmas III/Codes and Modeling III

P 20.5: Vortrag

Donnerstag, 23. März 2023, 18:45–19:00, CHE/0091

PIC simulations on the emittance of protons emitted from laser irradiated sub-micrometer thin targets — •Masoud Afshari, Thomas Rösch, and Jörg Schreiber — Physics Department, Ludwig-Maximilians-Universität München, Garching, Germany

In contrast to Target-Normal-Sheath-Accelerated (TNSA) protons from thick foils, where ε<0.004 mm-mrad was demonstrated experimentally 20 years ago [1], there have been experimental indications of significantly larger emittance values when using sub- micrometer thin targets [2]. We have started investigations with the particle in cell (PIC) code EPOCH [3] to investigate this matter. Our results based on the latest version 4.19 show that binary collisions might be responsible for a drastic increase of emittance.

We acknowledge support from the Centre for Advanced Laser Applications (CALA), and Super Computer LRZ under application number 24836.

[1] T. E. Cowan et al., Ultralow Emittance Multi-MeV Proton Beams from a Laser Virtual-Cathode Plasma Accelerator, Physical review letters 92.20 (2004).

[2] T. Rösch, Characterization of a permanent magnet quadrupoles focus of laser- accelerated protons, Ph.D. thesis, Faculty of Physics, LMU München.

[3] T. Arber et al., Contemporary particle-in-cell approach to laser-plasma modelling, Plasma Phys. Controlled Fusion 57 113001 (2015)