研究目的
Investigating the generation of a low-divergence relativistic proton jet from a thin solid target driven by an ultra-intense circularly polarized Laguerre–Gaussian laser pulse.
研究成果
The proposed ion acceleration scheme using an ultra-intense circularly polarized LG laser pulse can generate a low-divergence high-density relativistic proton jet. The number of high-energy protons can increase by a factor of more than tens for an emission angle smaller than 1°, compared with the case of Gaussian laser pulses. This scheme is very attractive for future high-power laser-driven ion accelerators.
研究不足
The scheme is sensitive to laser and target conditions and is subject to inherent plasma instabilities. The termination of the radiation pressure acceleration occurs due to processes such as separation of the pulse from the plasma, relativistic transparency, target surface bending, and the Rayleigh–Taylor instability.
1：Experimental Design and Method Selection:
Three-dimensional particle-in-cell (PIC) simulations were conducted to study the interaction of an ultra-intense circularly polarized Laguerre–Gaussian (LG) laser pulse with a thin solid target. The simulations aimed to demonstrate the generation of a low-divergence high-density relativistic proton jet.
2：Sample Selection and Data Sources:
The target was an electron-proton plasma with a density of n0 = 200nc = 3.5 × 1023 cm?3, where nc is the critical density for λ = 800 nm. The thickness of the foil was set to satisfy the optimum condition for radiation pressure acceleration (RPA) at a given reference intensity.
3：5 × 1023 cm?3, where nc is the critical density for λ = 800 nm. The thickness of the foil was set to satisfy the optimum condition for radiation pressure acceleration (RPA) at a given reference intensity.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The simulations were carried out with the ALPS code. The laser pulses had a wavelength of λ = 800 nm, a focal spot size w0 = 3 μm, and a pulse duration (FWHM) of 20 fs. The reference intensity varied from Ir = 1.0 × 1022 W cm?2 to Ir = 3.0 × 1023 W cm?
4：0 × 1022 W cm?2 to Ir = 0 × 1023 W cm?Experimental Procedures and Operational Workflow:
2.
4. Experimental Procedures and Operational Workflow: The simulation domain had a volume of 40 μm (x) × 40 μm (y) × 60 μm (z) and was divided into rectangular cells of size 20 nm (x) × 20 nm (y) × 5 nm (z). Ten macro-particles for each species were assigned into a cell. A laser field was launched on the xy plane at z = zmin.
5：Data Analysis Methods:
The proton energy spectra and angular distributions were analyzed to evaluate the performance of the LG pulse in generating a low-divergence proton jet compared to a Gaussian pulse.
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