Spatiotemporal characteristics of nanosecond pulsed discharge in an extremely asymmetric electric field at atmospheric pressure

Li ZHANG (张丽); Dezheng YANG (杨德正); Sen WANG (王森); Wenchun WANG (王文春)

doi:10.1088/2058-6272/aa632d

Plasma Science and Technology > 2017 > 19(6): 64006-064006. > DOI: 10.1088/2058-6272/aa632d

Li ZHANG (张丽), Dezheng YANG (杨德正), Sen WANG (王森), Wenchun WANG (王文春). Spatiotemporal characteristics of nanosecond pulsed discharge in an extremely asymmetric electric field at atmospheric pressure[J]. Plasma Science and Technology, 2017, 19(6): 64006-064006. DOI: 10.1088/2058-6272/aa632d

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Spatiotemporal characteristics of nanosecond pulsed discharge in an extremely asymmetric electric field at atmospheric pressure

Key Lab of Materials Modification (Dalian University of Technology), Ministry of Education, Dalian 116024, People’s Republic of China

Funds: This work is supported by the Key Project of Chinese National Programs for Research and Development (No. 2016YFC0207200), and National Natural Science Foundation of China (Nos. 51677019, 51407022, 51377014).

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Abstract

Abstract

In this paper, high resolution temporal-spatial diagnostics are employed to research the optical characteristics of nanosecond pulsed dielectric barrier discharge in needle-plate electrode configuration. Temporal-spatial distributions of discharge images, the emission intensities of optical emission spectra, and plasma vibrational and rotational temperatures are investigated. By analyzing the evolution of vibrational and rotational temperatures in space and time dimensions, the energy distribution and energy transfer process in plasma are also discussed. It is found that a diffuse structure with high density plasma concentrated in the region near the needle tip can be presented in nanosecond pulsed discharge, and an obvious energy transfer from electronic energy to vibration energy can be observed in each discharge pulse.
- nanosecond pulsed discharge,
- spatiotemporal emission spectrum,
- reduced electric field,
- breakdown mechanism

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