Effects of cathode operating parameters on the ignition voltage threshold of Hall thrusters

Li, Wenbo; Li, Hong; Ding, Yongjie; Wei, Liqiu; Yang, Xinyong; Cai, Haikuo; Sun, Jianfei; Yu, Daren

doi:10.1016/j.vacuum.2020.109169

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…When the thruster operated at a volume flow rate of 50 sccm, the vacuum pressure was below 5×10 −3 Pa. The uncertainty of the facility pressure was below 10% [26,27]. The uncertainty of the gas flow controller was approximately 1%, and the purity of the propellant was 99.9995%.…”

Section: Experimental Equipmentmentioning

confidence: 98%

Matching characteristics of magnetic field configuration and chamfered channel wall in a magnetically shielded Hall thruster

Wang

Zhong

et al. 2021

Plasma Sci. Technol.

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To date, the selection of the magnetic field line used to match the chamfered inner and outer channel walls in a magnetically shielded Hall thruster has not been quantitatively studied. Hence, an experimental study was conducted on a 1.35 kW magnetically shielded Hall thruster with a xenon propellant. Different magnetic field lines were chosen, and corresponding tangentially matched channel walls were manufactured and utilized. The results demonstrate that high performance and a qualified anti-sputtering effect cannot be achieved simultaneously. When the magnetic field lines that match the chamfered wall have a strength at the channel centerline of less than 12% of the maximum field strength, the channel wall can be adequately protected from ion sputtering. When the magnetic field lines have a strength ratio of 12%-20%, the thruster performance is high. These findings provide the first significant quantitative design reference for the match between the magnetic field line and chamfered channel wall in magnetically shielded Hall thrusters.

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Section: Experimental Equipmentmentioning

confidence: 98%

Matching characteristics of magnetic field configuration and chamfered channel wall in a magnetically shielded Hall thruster

Wang

Zhong

et al. 2021

Plasma Sci. Technol.

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“…Through the experimental and simulation analysis of the cathode-independent working process by Domonkos et al [30], Mikellides et al [31], combined with test results under coupled cathode and thruster conditions by Li et al [32], Albarède et al [10], Goebel et al [14], Manzella et al [19,20], Mazouffre et al [33] and others, showed that as the cathode flow rate decreases, ∆V c increases and the CEES deteriorates. Therefore, in this study, the method of changing the cathode working gas flow rate was used to simulate the working conditions under which the CEES was deteriorated.…”

Section: Experimental Setup and Measurementmentioning

confidence: 99%

Indicator of abnormal cathode electron emission state with gas flow in Hall thrusters

Li,

Zhou,

et al. 2024

J. Phys. D: Appl. Phys.

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The accurate diagnosis of abnormal electron emission state in hollow cathodes is crucial for the stable operation of Hall electric propulsion systems. In this study, a method of reducing the cathode working gas flow rate was used to simulate abnormal working conditions in which the cathode electron emission state (CEES) was deteriorating. By analyzing and comparing the oscillation signals under abnormal and steady-state working conditions, it was found that as the CEES deteriorated, the power content of the breathing oscillation decreased in the 1–40 kHz frequency band, and the main frequency decreased; in contrast, the power content of the transit-time oscillation increased in the 100–500 kHz range, and the main frequency was on the rise. Combined with the current growth rate analysis of breathing and transit-time oscillations, when the cathode gas flow rate decreases, the CEES deteriorates, the coupling voltage drop increases, and the potential drop in the channel decreases. The electron temperature and nonlinear power absorption of the electrons decrease, leading to a decrease in the growth rate of breathing oscillations and the breathing oscillation weakens; however, the time-averaged ion velocity and ion sound velocity in the channel decrease simultaneously, but the ion velocity decreases significantly faster than the ion sound velocity, leading to an increase in the growth rate of the transit-time oscillation, and the transit-time oscillation strengthen. Through comparison of the oscillation signals under different working conditions, such as varied anode flow rate, anode voltage, magnetic induction, it was proven to be a unique feature of CEES deteriorates, and can be used as an indicator of CEES deteriorates during the on-orbit operation of the Hall-effect thrusters.

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Effect of catalytic bed porosity and mass flow rate on decomposition and combustion processes of a HAN-Based monopropellant thruster

Guan

et al. 2021

Vacuum

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Effects of cathode operating parameters on the ignition voltage threshold of Hall thrusters

Cited by 7 publications

References 33 publications

Matching characteristics of magnetic field configuration and chamfered channel wall in a magnetically shielded Hall thruster

Matching characteristics of magnetic field configuration and chamfered channel wall in a magnetically shielded Hall thruster

Indicator of abnormal cathode electron emission state with gas flow in Hall thrusters

Effect of catalytic bed porosity and mass flow rate on decomposition and combustion processes of a HAN-Based monopropellant thruster

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