研究目的
Investigating the optimization of laser parameters for proton acceleration using double laser pulses in the target normal sheath acceleration (TNSA) mechanism.
研究成果
The introduction of double laser pulses with optimized parameters significantly enhances proton acceleration in the TNSA mechanism. The proton energy is found to be dependent on both laser intensity and pulse duration, with the maximum energy achieved when both laser pulses have equal intensity and longer pulse duration. The delay between the two laser pulses acts as a controlling parameter for proton energy, with shorter delays leading to higher energy gains.
研究不足
The study is based on simulations and may not fully capture all physical phenomena present in actual experimental conditions. The effect of target material and thickness variations, as well as the presence of preplasma, are not extensively explored.
1：Experimental Design and Method Selection:
The study uses 2D PIC simulation code EPOCH to investigate the effect of double laser pulses on proton acceleration in the TNSA mechanism. The simulation involves two laser pulses with varying intensities and pulse durations interacting with a solid target.
2：Sample Selection and Data Sources:
A fully ionized plasma of thickness 3 μm is considered as a solid target with electron and proton density of 40 nc, where nc is the critical plasma density.
3：List of Experimental Equipment and Materials:
The simulation uses two laser pulses linearly polarized with wavelength λL = 1 μm and spot size r0 = 6 μm. The normalized laser strength parameters are a0 = 10 and a0 = 7, corresponding to laser intensities of 1.36 × 1020 and 6.8 × 1019 W/cm2, respectively.
4：36 × 1020 and 8 × 1019 W/cm2, respectively.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The simulation box of size 50 μm × 40 μm is chosen, with the overdense plasma target placed at -5 μm. The grid size is Δx = 50 nm and Δy = 50 nm, with 25 particles per cell for each plasma species. Periodic boundary conditions are chosen in the transverse direction, and absorbing boundary conditions are chosen for the left and right boundary of the simulation box.
5：Data Analysis Methods:
The study analyzes the sheath field generation and proton energy spectrum under different combinations of laser intensity and pulse duration for the two laser pulses.
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