Two-dimensional simulation research of secondary electron emission avalanche discharge on vacuum insulator surface

Based on the secondary electron emission avalanche (SEEA) model, the SEEA discharge on the vacuum insulator surface is simulated by using a 2D PIC-MCC code developed by ourselves. The evolutions of the number of discharge electrons, insulator surface charge, current, and 2D particle distribution are...

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Bibliographic Details
Published in:Physics of plasmas 2015-01, Vol.22 (1)
Main Authors: Cai, Libing, Wang, Jianguo, Zhu, Xiangqin, Wang, Yue, Zhang, Dianhui
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Computer simulation
COMPUTERIZED SIMULATION
Current distribution
CURRENTS
DEGASSING
Dependence
DISTRIBUTION
ELECTRIC DISCHARGES
Electric field strength
ELECTRIC FIELDS
Electron avalanche
ELECTRON EMISSION
ELECTRONS
Outgassing
Plasma physics
PULSE RISE TIME
Simulation
Surface charge
TWO-DIMENSIONAL CALCULATIONS
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Summary:Based on the secondary electron emission avalanche (SEEA) model, the SEEA discharge on the vacuum insulator surface is simulated by using a 2D PIC-MCC code developed by ourselves. The evolutions of the number of discharge electrons, insulator surface charge, current, and 2D particle distribution are obtained. The effects of the strength of the applied electric field, secondary electron yield coefficient, rise time of the pulse, length of the insulator on the discharge are investigated. The results show that the number of the SEEA electrons presents a quadratic dependence upon the applied field strength. The SEEA current, which is on the order of Ampere, is directly proportional to the field strength and secondary electron yield coefficient. Finally, the electron-stimulated outgassing is included in the simulation code, and a three-phase discharge curve is presented by the simulation, which agrees with the experimental data.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4905640