研究目的
Investigating the optimization of electron acceleration by short laser pulses in low-density targets for the efficient production of gamma radiation, electron–positron pairs, neutrons, and pions.
研究成果
The self-trapping regime of laser pulse propagation in near-critical plasma enables stable propagation over many Rayleigh lengths and maximizes the produced total charge of multi-mega-electron-volt electrons. This regime is suitable for efficient production of gamma quanta, positrons, neutrons, and pions, with potential applications in radiography, materials science, and security inspections.
研究不足
The study is relevant to the sharp target-vacuum interface corresponding to high laser contrast. A finite laser intensity contrast ratio may affect the propagation of the main pulse, potentially leading to strong pulse destruction in preplasma.
1：Experimental Design and Method Selection:
3D particle-in-cell simulations were used to model electron acceleration in low-density targets with lasers of varying intensities and powers. Monte Carlo simulations complemented these to model gamma, positron, and photonuclear particle production.
2：Sample Selection and Data Sources:
The study focused on low-density plasma targets with electron densities from a few percent of the electron critical density to near-critical densities.
3：List of Experimental Equipment and Materials:
High-performance electromagnetic code VSim (VORPAL) for simulations, GEANT4 code for Monte Carlo simulations.
4：Experimental Procedures and Operational Workflow:
Laser pulses of varying energies were focused on the front side of the target. The plasma target consisted of electrons and ions with varying densities and thicknesses.
5：Data Analysis Methods:
The generated electron bunches were analyzed for their energy spectra and total charge. The interaction of these electrons with a converter target was simulated to study the production of gamma rays, positrons, neutrons, and pions.
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