研究目的
Characterizing the nonequilibrium plasma generated by nanosecond laser pulses using a SiC detector in time-of-flight configuration to measure the radiations emitted from the plasma.
研究成果
SiC Schottky detectors are effective for detecting radiation emitted by plasmas generated by laser impulses, providing information on plasma electron temperature, maximum proton energy, ion charge states, and X-ray emission. The plasma temperature increases with the atomic number of the target, and the detector's active region depth must be adjusted based on laser intensity for optimal detection.
研究不足
The study is limited to low-intensity laser pulses (1010 W/cm2) and does not cover higher intensities. The characterization of plasma is not complete, as it does not include parameters like density, temperature, and density gradient versus time and space, X-rays, electrons and ion energy distribution, and angular particle emission.
1：Experimental Design and Method Selection:
The study uses a SiC detector in time-of-flight (TOF) configuration to measure radiations emitted from plasma generated by nanosecond laser pulses.
2：Sample Selection and Data Sources:
Different metallic targets (PE, BN, Al, Cu, Sn, Ta) were irradiated by a Q-switched Nd:Yag pulsed laser.
3：List of Experimental Equipment and Materials:
A Q-switched Nd:Yag pulsed laser (Litron lasers@), SiC Schottky diodes, and a fast storage oscilloscope (Tektronix, 500 MHz, 4 GS/s) were used.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused on targets inside a vacuum chamber, and the SiC detector was placed along the normal to the target surface. The detector's output was acquired through the oscilloscope.
5：Data Analysis Methods:
The TOF spectra were analyzed to determine particle velocity and corresponding kinetic energy, with plasma temperature and ion charge states calculated based on the data.
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