研究目的
Investigating the acceleration of carbon ions by 10 PW laser pulses on ELI-NP, focusing on the effects of laser polarization and target thickness on particle acceleration and angular divergence.
研究成果
The study demonstrates that carbon ions can be accelerated to energies up to 5 GeV using 10 PW class lasers with circular polarized pulses, with an optimal target thickness of 120 nm. The breakout afterburner (BOA) mechanism is identified as the primary cause of high-energy ion acceleration for optimal target thicknesses. The research highlights the potential of laser-driven ion acceleration for applications such as carbon radiotherapy.
研究不足
The study is limited to 2D simulations, which may not fully capture all aspects of the 3D physical processes involved in laser-plasma interactions. Additionally, the simulations did not include Quantum Electrodynamics (QED) effects, which could be significant at the irradiances studied.
1：Experimental Design and Method Selection:
2D particle-in-cell (PIC) simulations were conducted using the relativistic electromagnetic code EPOCH to study carbon ion acceleration by 10 PW laser pulses. Both circular polarized (CP) and linear polarized (LP) pulses were considered.
2：Sample Selection and Data Sources:
A thickness scan of solid carbon targets was performed, varying from 10 to 600 nm with a step-like density profile. The initial electron density in the target was set to 6.78 × 1029 m?
3：78 × 1029 m?List of Experimental Equipment and Materials:
3.
3. List of Experimental Equipment and Materials: The simulation utilized a Gaussian CP and LP laser pulses with a peak irradiance of 5 × 1022 W cm?2, focused to a 3 μm focal spot. The laser wavelength was 0.82 μm with a pulse duration of 25 fs.
4：82 μm with a pulse duration of 25 fs.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The simulation domain was 13 μm × 20 μm, discretized into 6500 × 2000 cells. Open boundary conditions were used for both particles and fields. A total of 300 particles/cell for electrons and 100 particles/cell for C6+ were used.
5：Data Analysis Methods:
The energy spectra of carbon ions and electrons, their temperature, and the angular divergence of carbon ions were analyzed to understand the acceleration mechanisms.
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