Stable laser-produced quasimonoenergetic proton beams from interactive laser and target shaping

J. L. Liu, M. Chen, Z. M. Sheng, C. S. Liu, W. B. Mori, J. Zhang

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3 Citations (Scopus)
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Abstract

In radiation pressure dominated laser ion acceleration schemes, transverse target deformation and Rayleigh-Taylor (RT)-like instability always develop quickly, break the acceleration structure, limit the final accelerated ion energy, and lower the beam quality. To overcome these issues, we propose a target design named dual parabola targets consisting of a lateral thick part and a middle thin part, each with a parabolic front surface of different focus positions. By using such a target, through interactive laser and target shaping processes, the central part of the thin target will detach from the whole target and a microtarget is formed. This enables the stable acceleration of the central part of the target to high energy with high quality since usual target deformation and RT-like instabilities with planar targets are suppressed. Furthermore, this target design reduces the laser intensity required to optimize radiation pressure acceleration by more than 1 order of magnitude compared to normal flat targets with similar thickness and density. Two-dimensional particle-in-cell simulations indicate that a quasimonoenergetic proton beam with peak energy over 200 MeV and energy spread around 2% can be generated when such a solid target (with density 400nc and target thickness 0.5λ0) is irradiated by a 100 fs long circularly polarized laser pulse at focused intensity IL∼9.2×1021 W/cm2.

Original languageEnglish
Article number121301
Number of pages10
JournalPhysical Review Special Topics: Accelerators and Beams
Volume16
Issue number12
DOIs
Publication statusPublished - 5 Dec 2013

Keywords

  • ion acceleration
  • proton beams
  • target shaping

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