Author(s)

Jie Huang ¹, Zhe Liu ¹, Jiangshan Chen ¹, Haopeng Li ¹

Affiliation(s)

¹ Nuclear Power Institute of China, Chengdu, China

Corresponding Author

Jie Huang

ABSTRACT

Laser interferometric technology is an important means for diagnosing plasmas due to its high temporal and spatial resolution. In this work, an air switch discharge plasma was diagnosed by a Mach-Zehnder laser interferometer with a wavelength of 532 nm. The air switch discharge plasma was generated between two needle-type Cu electrodes. Three dimensional electron density profiles of the air switch discharge plasma were deduced by numerical processing the interferograms containing plasma phase information obtained from experiments, revealing the formation and evolution processes of the arc channel of the air switch between the electrodes. At the start of the discharge, a large number of electrons were generated at the cathode, and then accelerated to the anode under the action of the electric field. During motion, neutral gas was ionized, and a cylindrical arc channel formed rapidly. A large pressure gradient was generated due to the dense plasma in the arc channel, so the dense plasma began to expand and push the surrounding air, forming a shock wave. The experimental results indicated that laser interferometric technology is an effective way to study air switch discharge plasmas.

KEYWORDS

Air switch discharge plasma, laser interferometric technology, electron density, shock wave

CITE THIS PAPER

Jie Huang, Zhe Liu, Jiangshan Chen, Haopeng Li, Study on gas spark discharge plasma diagnosed by laser interferometric technology. Journal of Materials, Processing and Design (2023) Vol. 7: 49-58. DOI: http://dx.doi.org/10.23977/jmpd.2023.070108.

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