研究目的
Investigating the use of femtosecond broadband X-rays from laser wakefield acceleration as a source for pump-probe X-ray absorption studies.
研究成果
The study demonstrated proof-of-principle single-shot time-resolved absorption spectroscopy of rapidly heated dense plasma using ultra-fast X-rays from a laser wakefield accelerator. The observed blue-shift of the K-edge indicates rapid changes in the absorption spectrum, suggesting potential for studying phenomena like hollow atom formation and warm dense matter opacities with improved spectral resolution.
研究不足
The spectral resolution of the single photon counting technique was limited, making it unsuitable for studying fine edge structure. The photon flux fluctuations and the need for high occupancy rejection criteria also posed challenges.
1：Experimental Design and Method Selection:
The experiment utilized a split laser pulse from the Hercules laser system to simultaneously heat an aluminum foil and generate X-rays via laser wakefield acceleration. The X-rays were used to probe the heated plasma at various delays.
2：Sample Selection and Data Sources:
A 4 μm thickness aluminum foil was used as the target for heating. X-rays generated by betatron oscillations in the wakefield were used to probe the plasma.
3：List of Experimental Equipment and Materials:
Hercules laser system, aluminum foil, Andor Kon-L deep-depletion X-ray CCD camera.
4：Experimental Procedures and Operational Workflow:
The laser pulse was split into two beams; one heated the aluminum foil, and the other drove the wakefield accelerator. The timing between the pump and probe beams was controlled with a delay stage.
5：Data Analysis Methods:
Single photon counting algorithm was used to analyze the CCD images to generate spectra. The algorithm accounted for charge spreading and double hits to improve spectral accuracy.
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