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P: Fachverband Plasmaphysik

P 8: Laser Plasmas I

P 8.4: Vortrag

Mittwoch, 1. September 2021, 15:00–15:15, H5

Monoenergetic High-Energy Ion Source via Femtosecond Laser Interacting With a Microtape — •Xiaofei Shen and Alexander Pukhov — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany

Intense laser-based ion sources are characterized by unsurpassed acceleration gradient and exceptional beam emittance. They are promising candidates for next-generation accelerator towards a broad range of potential applications. However, the ion beams achieved currently have limitations in energy spread and peak ion energy. In this talk, I will present our recent work on achieving monoenergetic proton beams with energy spread at 1% level and peak energy of hundred MeV. Using fully three-dimensional particle-in-cell simulations, we show that such proton beams can be stably generated by using a readily available femtosecond laser interacting with a microtape. As the laser pulse sweeps along the tape, it drags out a huge charge (~100 nC) of collimated energetic electrons and accelerates them along the tape surface to superponderomotve energies. When this dense electron current arrives at the rear edge of the tape, it induces a strong electrostatic field. Due to the excessive space charge of electrons, the longitudinal field becomes bunching while the transverse field is focusing for protons. Together, this leads to a highly monoenergetic energy spectrum and much higher proton energy as compared to simulation results from typical target normal sheath acceleration and radiation pressure acceleration at the same laser parameters.