研究目的
The main objective of this work is to understand the distribution of Te and ne in a nanosecond pulsed discharge argon plasma at low pressure in detail.
研究成果
In the present work, we carried out a detailed diagnosis of electron density and temperature distribution in a nanosecond pulsed discharge argon plasma by using laser Thomson scattering approach. The spatial-temporal distribution of ne and Te were measured. The measured plasma parameters are ne in the range of 2.1 × 1019–1.7 × 1021 m?3 and Te in the range of 0.1–1.8 eV. The results indicate that using the rising edge of ns-pulse voltage, the electron density can significantly be enhanced. During the effective working time, the range of ne varying with time at the middle position of r-direction is significant than the edges.
研究不足
The main physical challenge of LTS is the weak signal of the Thomson scattering compared to the strong laser stray light and Rayleigh Scattering (RS).
1：Experimental Design and Method Selection:
The experiment used Laser Thomson Scattering (LTS) to measure the spatial-temporal distribution of electron temperature and density in a nanosecond pulsed discharge argon plasma. A home-made Triple Grating Spectrometer (TGS) was used to filter out noise from stray light and Rayleigh scattering.
2：Sample Selection and Data Sources:
The experiment was conducted with argon gas (
3：99% purity) at 2 × 103 Pa. List of Experimental Equipment and Materials:
The setup included a nanosecond pulse source, a fast high voltage transistor switching module (Behlke HTS 180), a high voltage probe (Tektronix P6015A), a current transformer (Pearson 2877), a four-channel fast digital oscilloscope (LeCroy 715 Zi), a mass flow controller, a laser (Quanta Ray, Lab-170), and an ICCD camera (Andor, 340T).
4：Experimental Procedures and Operational Workflow:
The experiment involved synchronizing the laser, discharge, and spectral signal using digital delay generators, focusing the laser beam to interact with the plasma, and collecting the scattered light perpendicularly.
5：Data Analysis Methods:
The Thomson scattering spectrum was analyzed using Gaussian fitting to obtain clear signals free of noise.
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