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Energy spectra of carbon ions accelerated in the LICPA scheme (with the cavity length Lc varying from 40 μm to 160 μm) or in the RPA scheme (without the cavity). LT = 2 μm, IL = 2.5 × 1021 cm2, Rc = 0.64, lacc = 150 μm.
Energy spectra of carbon ions produced in the LICPA accelerator at different laser intensities. Lc = 120 μm, Rc = 0.64, lacc = 200 μm.
Snapshots of the space distributions of ion (ρi) and electron (ρe) densities for plasma bunches accelerated in the LICPA (a) and RPA (b)schemes. IL = 5 × 1021 W/cm2, LT = 8 μm, Lc = 120 μm or ∞, Rc = 0.64.
The laser-ions energy conversion efficiency in the LICPA scheme and the conventional RPA scheme as a function of laser intensity for a 2 μm target (a) and an 8 μm target (b). Solid and dashed lines denote the GLS model predictions. Circular and square dots denote results of the PIC simulations. Lc = 120 μm or ∞, Rc = 0.64. For the PIC simulations, lacc = 200 μm.
Parameters of carbon ion beams produced in the LICPA accelerator and the conventional RPA scheme. for both schemes, a 100 kJ/50 PW circularly polarized laser beam of 50 μm aperture was used as a laser driver. LT = 2 μm, Lc = 120 μm or ∞, Rc = 0.64, lacc = 200 μm.
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