Diagnosis of Electron, Vibrational and Rotational Temperatures in an Ar/N <sub>2</sub> Shock Plasma Jet Produced by a Low Pressure DC Cascade Arc Discharge

LI Cong (李聪); ZHANG Jialiang (张家良); YAO Zhi (姚志); WU Xingwei (吴兴伟); et al.

doi:10.1088/1009-0630/15/9/08

Plasma Science and Technology > 2013 > 15(9): 875-880. > DOI: 10.1088/1009-0630/15/9/08

LI Cong (李聪), ZHANG Jialiang (张家良), YAO Zhi (姚志), WU Xingwei (吴兴伟), et al.. Diagnosis of Electron, Vibrational and Rotational Temperatures in an Ar/N ₂ Shock Plasma Jet Produced by a Low Pressure DC Cascade Arc Discharge[J]. Plasma Science and Technology, 2013, 15(9): 875-880. DOI: 10.1088/1009-0630/15/9/08

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Diagnosis of Electron, Vibrational and Rotational Temperatures in an Ar/N ₂ Shock Plasma Jet Produced by a Low Pressure DC Cascade Arc Discharge

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Chinese Ministry of Education, School of Physics and Optical Electronic Technology, Dalian University of Technology, Dalian 116024, China

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (Nos.2013GB109005, 2009GB106004), National Natural Science Foundation of China (Nos.11175035, 10875023), the Fundamental Research Funds for the Central Universities of China (DUT 12ZD(G)01, DUT 11ZD(G)06)

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Received Date: May 02, 2012

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Abstract

Abstract

In this paper, a low pressure Ar/N ₂ shock plasma jet with clearly multicycle al- ternating zones produced by a DC cascade arc discharge has been investigated by an emission spectral method combined with Abel inversion analysis. Plasma emission intensity, electron, vi- brational and rotational temperatures of the shock plasma have been measured in the expansion and compression zones. The results indicate that the ranges of the measured electron temperature, vibrational temperature and rotational temperature are 1.1 eV to 1.6 eV, 0.2 eV to 0.7 eV and 0.19 eV to 0.22 eV, respectively, and it is found for the first time that the vibrational and rota- tional temperatures increase while the electron temperature decreases in the compression zones. The electron temperature departs from the vibrational and the rotational temperatures due to non-equilibrium plasma effects. Electrons and heavy particles could not completely exchange energy via collisions in the shock plasma jet under the low pressure of 620 Pa or so.
- DC arc torch,
- plasma jet,
- shock wave,
- electron temperature,
- vibrational temperature,
- rotational temperature,
- emission spectral diagnosis

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