Kinetics Characteristics and Bremsstrahlung of Argon DC Discharge Under Atmospheric Pressure

An improved self-consistent, multi-component, and one-dimensional plasma model for simulating atmospheric pressure argon glow discharge is presented. In the model, both the plasma hydrodynamics model and chemical model are considered. The numerical simulation is carried out for parallel-plate geomet...

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Bibliographic Details
Published in:Plasma science & technology 2013-04, Vol.15 (4), p.335-342
Main Authors: He, Wei, Liu, Xinghua, Xian, Richang, Chen, Suhong, Liao, Ruijin, Yang, Fan, Xiao, Hanguang
Format: Article
Language:English
Subjects:
Argon
Barometric pressure
Bremsstrahlung
Density
Electric potential
Glow discharges
Ground state
Ionization
Mathematical models
动力学
常压
氩气
特征和
直流放电
轫致辐射
辉光放电
辐射功率密度
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Summary:An improved self-consistent, multi-component, and one-dimensional plasma model for simulating atmospheric pressure argon glow discharge is presented. In the model, both the plasma hydrodynamics model and chemical model are considered. The numerical simulation is carried out for parallel-plate geometry with a separation of 0.06 cm. The results show that Ar＊ plays a major role in the discharge, which is mainly produced by ground state excitation reaction. The electron temperature reaches its maximum in the cathode sheath but maintains a low value （0.23 eV） in bulk plasma. Elastic collision is the dominant volumetric electron energy loss in atmosphere argon glow discharge, which is negligible in low pressure argon glow discharge. The metastable step-wise ionization is the main mechanism for electron production to sustain the discharge. However, the highest contribution to electron production rate is ground state ionization reaction. The bremsstrahlung power density is related to electric voltage. With the increase of the electric voltage, the bremsstrahlung power density increases, namely, the strength of ultraviolet radiation spectrum enhances in the cathode sheath.
ISSN:1009-0630
DOI:10.1088/1009-0630/15/4/06