研究目的
Investigating the generation of proton beams from hydrocarbon polymer targets using a laser ion source to identify the target that can provide proton with higher flux and the optimal condition of laser irradiation.
研究成果
The results indicated that the peak currents and fraction to total particle number of proton were similar for the different hydrocarbon polymer targets. Increasing the laser intensity effectively increases the number of proton particles because the larger the laser intensity, the larger the total charge. The study suggests that the choice of hydrocarbon polymer target does not significantly affect the proton generation efficiency under the tested conditions.
研究不足
The study was limited to three types of hydrocarbon polymer targets and a specific range of laser intensities. The cross section for electron impact ionization of proton is smaller than that of carbon, which may affect the fraction of proton compared to the composition ratio of hydrogen to carbon in the target plastic.
1：Experimental Design and Method Selection:
The study utilized a Nd:YAG laser to generate ablation plasmas from three types of hydrocarbon polymer targets. The ion current and the fraction of ion species were measured using a Faraday cup and an electrostatic ion analyzer.
2：Sample Selection and Data Sources:
Polyethylene (C2H4)n, polypropylene (C3H6)n, and polystyrene (C8H8)n targets were used. The laser intensity was varied to observe its effect on proton generation.
3：List of Experimental Equipment and Materials:
Nd:YAG laser (532 nm/17 ns, 0.2 J), Faraday cup, electrostatic ion analyzer (EIA), secondary electron multiplier (SEM).
4：2 J), Faraday cup, electrostatic ion analyzer (EIA), secondary electron multiplier (SEM).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser was focused on the target to generate plasma. The ion current was measured using a Faraday cup, and the ion charge state distributions were measured using an EIA.
5：Data Analysis Methods:
The ion current waveforms were integrated over time to calculate the total charge per pulse. The charge state distributions were analyzed to estimate the proton current and fraction to total particle number.
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