研究目的
Investigating the control of energy distribution of fast ions and X-ray emission via target reliefs in ultrafast and relativistic laser plasma interaction.
研究成果
The presence or absence of a relief on the target surface determines the absorption coefficient and electron parameters. The use of a nanorelief at the target front surface is a flexible method to control the target absorption of femtosecond laser pulses at a relativistic intensity and high temporal contrast. Change of the relief parameters allows selectively influencing the hot and cold electron ensembles of energy distribution function, achieving the maximum energy of protons or the maximum K-a yield.
研究不足
The study is limited to theoretical analysis and comparison to recent experiments, with specific focus on titanium foil targets and femtosecond near infrared laser pulses. The applicability of the findings to other materials or laser parameters is not explored.
1：Experimental Design and Method Selection:
The study involves theoretical analysis and comparison to recent experiments on laser plasma interaction, focusing on the optimization of laser light absorption via structuring of the target surface.
2：Sample Selection and Data Sources:
Titanium foil targets of a few micrometer thicknesses are used. Laser intensities up to 5 (cid:2) 1020 W/cm2 produced with femtosecond near infrared laser pulses are applied.
3：List of Experimental Equipment and Materials:
Femtosecond near infrared laser pulses, titanium foil targets.
4：Experimental Procedures and Operational Workflow:
The study involves structuring the target surface to optimize laser light absorption and analyzing the energy transfer from the laser pulse to fast ions and X-rays.
5：Data Analysis Methods:
The analysis includes comparing the response of ion and K-a emissions to different branches of the electron distribution function.
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