研究目的
To study the emission of hot electrons from plasmas produced by high-power and high-energy lasers on thin foil metal targets and to correlate the number of these electrons with the flux of soft x-ray radiation.
研究成果
The study confirmed the production of hot electrons by laser interaction with thin foil metal targets and established a correlation between the number of thermal plasma electrons and the flux of soft x-ray radiation. Further investigation is required to study electrons with energies below 50 keV, which contribute significantly to the target current.
研究不足
The electron spectrometers have a lower energy detection limit, missing electrons with energies below 50 keV. The x-ray streak camera has limited sensitivity and temporal resolution. Precise time synchronization between interferometry and streak camera was not available.
1：Experimental Design and Method Selection:
The experiment was conducted using the PALS kJ laser facility to produce plasmas on thin foil metal targets. An array of electron spectrometers was used to study the emission of hot electrons, and femtosecond interferometry was employed to obtain spatial electron density profiles.
2：Sample Selection and Data Sources:
Thin metal foils (Mo, Nb, Pb, Zn) of 6 μm thickness were used as targets. Data was collected using electron spectrometers, femtosecond interferometry, target probes, and an x-ray streak camera.
3：List of Experimental Equipment and Materials:
PALS kJ laser facility, electron spectrometers, Fuji BAS-SR imaging plates, titanium-sapphire femtosecond laser, Nomarski type interferometers, x-ray streak camera.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused on the target to produce plasma. Electron emission was recorded at several angles around the target. Interferometry was used to obtain electron density profiles at selected time delays. X-ray emission was recorded using a streak camera.
5：Data Analysis Methods:
The energy spectra of electrons were analyzed using imaging plates. Interferograms were processed using FFT-based analysis and inverse Abel transform to obtain electron densities. X-ray streak images were analyzed to correlate with electron densities.
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