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P: Fachverband Plasmaphysik

P 17: Poster II

P 17.43: Poster

Friday, September 3, 2021, 14:00–16:00, P

Optimized electron injection into a linear plasma wakefield by means of laser-solid interaction — •Vadim Khudiakov and Alexander Pukhov — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany

We explore a hybrid plasma acceleration scheme via numerical simulations. The key feature of the method is to inject an electron bunch generated from laser-solid interaction into appropriate phase of a plasma wave. Recent work [1] demonstrates that a femtosecond laser pulse with energy of tens of mJ hitting a dense plasma target at 45 degrees angle expels well collimated electrons and accelerates them up to several MeVs in a direction close to pulse refection. In our work we reproduce these results with 3d particle-in-cell simulations using VLPL code and examine different injection parameters: injection angle, phase of plasma wake, laser pulse amplitude, in order to optimize trapped charge. An approximate trapping condition is derived for theoretical estimation of optimal injection parameters and is verified in simulations. Acceleration in a linear quasi-static wave with the parameters of AWAKE experiment provides bunches feature ~100 pC charge, ~60 micrometers transverse normalized emittance, and energies of several GeV with spread ~1%.

[1] I. Tsymbalov et al., Plasma Phys. Control. Fusion 61 (2019) 075016.