研究目的
Investigating the ion acceleration from aluminium plasma generated by a femtosecond laser under different conditions.
研究成果
The study demonstrated that proton acceleration can be optimized by controlling laser parameters, irradiation conditions, and target properties. The use of an anti-reflecting rGO film on the Al target surface and optimizing the target thickness and laser focal position enhanced ion acceleration. The findings contribute to the understanding of laser-plasma interactions and ion acceleration mechanisms.
研究不足
The study was limited by the laser parameters, irradiation conditions, and target properties. The maximum proton acceleration achieved was 2.3 MeV, which may not be sufficient for some applications. The effects of other laser parameters and target compositions were not fully explored.
1：Experimental Design and Method Selection:
The experiment involved irradiating Al foils with a femtosecond laser to generate non-equilibrium plasma and accelerate ions in the forward direction using the target-normal-sheath acceleration (TNSA) regime. Time-of-flight (TOF) technique was used to measure ions' kinetic energy.
2：Sample Selection and Data Sources:
Aluminium targets of various thicknesses (1, 3, 6, 10, and 20 μm) were used, some covered with a thin film of reduced graphene oxide (rGO) to reduce surface reflection.
3：List of Experimental Equipment and Materials:
A titanium-sapphire femtosecond laser (Pulsar 10 TW), SiC detectors, ion collectors (ICs), and HD V2 gafchromic detectors were used.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused onto the target in a vacuum chamber. The focal position, laser pulse energy, and laser contrast were varied to monitor their effects on ion acceleration.
5：Data Analysis Methods:
The energy spectra of ions were analyzed using TOF measurements. The stopping powers, energy loss, straggling, and ranges of ions were calculated using the SRIM code.
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