Research on Two-dimensional Simulation Model of Discharge Instability of Hollow Cathode Plume Plasma

doi:10.12382/bgxb.2022.0946

Abstract

Abstract:

In the process of hollow cathode discharge, the space potential oscillation affects its working performance, and the high-energy ions generated in the oscillation process cause sputtering corrosion to the cathode orifice, which seriously affect the lifetime of hollow cathode. In this paper, an integrated coupling model consisting of prticle-in-cell (PIC) model, oscillation amplitude model and equivalent circuit model is established to calculate the potential oscillation characteristics of hollow cathode. Firstly, PIC model is used to calculate the discharge characteristics of plume plasma under the conditions of different discharge currents, discharge voltages and gas flow rates, and the spatial plasma distribution of time-averaged parameters such as plume potential, plasma number density, electric field strength and electron temperature is obtained. Secondly, based on the plasma aggregation and dissipation theory, the potential oscillation amplitude model is established, and the spatial potential oscillation amplitude is estimated according to the calculated time-averaged parameters. Finally, the plasma time-averaged parameters and potential amplitude oscillation parameters are taken as input parameters and brought into the hollow cathode discharge equivalent circuit model to obtain the potential oscillation waveform under the corresponding working conditions. By comparing with the experimental results, it is found that the integrated coupling model established in this paper can predict the plasma potential oscillation of hollow cathode plume, and the research results can be used to guide the stable discharge of hollow cathode, thus improving its service lifetime.

Key words: hollow cathode, prticle-in-cell model, potential oscillation, equivalent circuit model, plasma aggregation and dissipation

CLC Number:

TIAN Feng, MIAO Long, LIANG Fuwen, SONG Jiahui, HE Zihao, WU Zhiwen, WANG Ningfei. Research on Two-dimensional Simulation Model of Discharge Instability of Hollow Cathode Plume Plasma[J]. Acta Armamentarii, 2024, 45(4): 1208-1218.

Figures/Tables 18

Fig.1 Schematic diagram of hollow cathode ground test

Fig.2 Schematic diagram of diagnostic measuring device for hollow cathode discharge oscillation experiment

Fig.3 Flow chart of PIC simulation

Fig.4 RC equivalent circuit for hollow cathode

Fig.5 Flow chart of hollow cathode discharge oscillation prediction

Fig.6 Simulation calculation domain

Fig.7 Electron temperature near the outlet of hollow cathode (3A)

Fig.8 Electron temperature near the outlet of hollow cathode (5A)

Fig.9 Potential pulse near the outlet of hollow cathode

Table 1 Simulation input parameters

工况	工质流量/sccm	电流/A
1	2.5	9
2	7.5	3
3	7.5	9

Fig.10 PIC simulated results of space potential

Fig.11 Maximum space potential under different discharge conditions

Fig.12 PIC simulated results of electric field strength

Fig.13 PIC simulated results of ion density

Fig.14 PIC simulated results of electronic density

Fig.15 PIC simulated results of electron temperature

Fig.16 Potential oscillation amplitude of hollow cathode plume under Condition 1

Fig.17 Hollow cathode plume under Condition 1

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