研究目的
Optimisation of the proton source through a detailed parametric scan of the interaction conditions by varying different laser and target parameters.
研究成果
The study confirmed the underlying mechanism of Coulomb-explosion as a dominating effect over a wide intensity range. Operating the source in the gaseous regime results in a very stable proton beam in energy with low shot-to-shot fluctuation, and the energy can be tuned quickly by the temperature and pressure settings of the target system. The system in its current stage is a versatile tool for research, delivering ultra-short bunches of protons by a continuous and debris-free generation process.
研究不足
The proton energies are in the moderate range of 100 s of keV, and the current combination of the cluster jet source and the given focal volume is not suitable to aim routinely for higher energies from μm size hydrogen droplets due to low interaction-probability.
1：Experimental Design and Method Selection:
The study involved a detailed parametric scan of the interaction conditions by varying different laser and target parameters to optimize the proton source.
2：Sample Selection and Data Sources:
A hydrogen cluster target was used, with parameters such as gas temperature and pressure varied to study their effects on proton acceleration.
3：List of Experimental Equipment and Materials:
The ARCTURUS laser system, a Ti:sapphire based chirped pulse amplification laser system, was used alongside a new hydrogen cluster target.
4：Experimental Procedures and Operational Workflow:
The laser was focused onto the hydrogen cluster target, and proton beams were detected in 0° and 45° directions using Thomson-parabola spectrometers.
5：Data Analysis Methods:
The proton spectra were evaluated using a Matlab routine, with the cut-off energy determined for every spectrum.
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