1. Modeling of interaction between arc and macroparticle in vacuum trigatron.
- Author
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Wang, Lijun, Yang, Ze, Zhang, Xiao, Jia, Shenli, Zhong, Wei, and Xu, Ao
- Subjects
VACUUM arcs ,PLASMA magnetohydrodynamics ,HEAT transfer ,MATHEMATICAL models of thermodynamics ,ELECTRODES ,VACUUM technology equipment ,PLASMA gas research - Abstract
This work investigates the interaction between high current vacuum arc (HCVA) and the macroparticle (MP) generated from the cathode spots in the small-size vacuum trigatron. Magnetohydrodynamic (MHD) model is used to describe the arc column. MPs are added into the MHD model, which are described by discrete phase model. The control equations of MPs include charging equation, motion equation, and heat transfer equation, in which the evaporation of MPs is also considered. Based on the above model, the effects of the diameter and initial velocity of MPs on the characteristics of them are studied. Simulation results show that MPs leave the interelectrode gap with a deflection angle larger than the initial angle under the influence of plasma. The motion of MPs is similar to that of projectiles. MPs with smaller diameter or slower velocity are influenced by the arc plasma more significantly. MPs can act as a source of the plasma, but these influences are not obvious in HCVA. What may be more harmful to the trigatron is the charging process of MPs during post-arc process. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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