Impact of the Insulator on the Electric Field and Generation Characteristics of Vacuum Arc Metal Plasmas

LIU Wenzheng(刘文正); WANG Hao(王浩); DOU Zhijun(窦志军)

doi:10.1088/1009-0630/16/2/09

Plasma Science and Technology > 2014 > 16(2): 134-141. > DOI: 10.1088/1009-0630/16/2/09

LIU Wenzheng(刘文正), WANG Hao(王浩), DOU Zhijun(窦志军). Impact of the Insulator on the Electric Field and Generation Characteristics of Vacuum Arc Metal Plasmas[J]. Plasma Science and Technology, 2014, 16(2): 134-141. DOI: 10.1088/1009-0630/16/2/09

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Impact of the Insulator on the Electric Field and Generation Characteristics of Vacuum Arc Metal Plasmas

School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Funds: supported by the Scientific Research Starting Foundation for Returned Overseas Chinese Scholars, Ministry of Education, China (Nos.E07C30010 and EJ06014)

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Received Date: August 21, 2013

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Abstract

Abstract

The field electron emission plays a vital role in the process of vacuum discharge breakdown. The electric field strength at the cathode tip is significant to the generation char- acteristics of vacuum arc metal plasmas. To increase the field strength at the cathode tip, a coaxial electrode plasma source was employed with an insulator settled between the electrodes. The math expression of the field strength is derived based on the Gauss theory. The impact of the insulator on the electric field and parameters of plasmas were investigated by MAXWELL 3D^® simulation software and the Langmuir probe. In addition, a composite insulator was adopted to further strengthen the field strength. A series of experiments were performed to focus on the role of the composite insulator in detail. The experimental and simulation results indicate that, a reasonable layout of the insulator, especially the composite insulator, can effectively increase the field strength at the cathode tip and the plasma density.
- vacuum,
- metal plasmas,
- insulator,
- electric field,
- generation characteristics

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References (17)

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