A novel optical emission spectroscopy method for diagnostics of contribution of different ionization mechanisms and flux of ions in different valences in discharge channel of a Hall thruster

WANG, Yanfei; ZHU, Ximing; ZOU, Renqiu; YAN, Shilin; JIA, Junwei; NING, Zhongxi; YU, Daren

doi:10.1016/j.cja.2024.01.005

Cited by 3 publications

(1 citation statement)

References 63 publications

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“…Finally, since there are currently no relevant papers describing the results of analyzing oscillation power, it is a lack of relevant parameters for comparison. Meanwhile, other noninvasive measurement methods such as spectroscopy [56], images [57] and thermal imaging [58], etc. are limited by their measurement methods and principles, and it is difficult to collect the continuously oscillating discharge voltage and discharge current simultaneously.…”

Section: Discussion and Analysismentioning

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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Section: Discussion and Analysismentioning

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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Analysis and control of Hall effect thruster using optical emission spectroscopy and artificial neural network

Ben Slimane,

Leduc,

Schiesko

et al. 2024

Journal of Applied Physics

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This study presents a proof-of-principle for using optical emission spectroscopy and artificial neural networks for real-time monitoring and control of the operational parameters of a Hall effect thruster: the anode voltage, the anode xenon injection, the discharge current, and the coil current. In that regard, we build an optical database of 26 spectral lines across 6469 operating conditions to train and test the neural network. We then reduced the learning lines from 26 to 15 based on their statistical correlation with the target parameters. After tuning the hyperparameters of the network, the network predicted the thruster’s parameters with notable accuracies: 95% for the anode voltage, 84% for the coil current, and 99% for both the anode flow rate and the discharge current. The estimated uncertainty of predictions, at 3σ, is ±51V for voltage, ±1A for coil current, ±0.15A for discharge current, and ±0.15mgs−1 for anode flow rate. The prediction calculations were within milliseconds and enabled real-time monitoring of the thruster parameters. Therefore, a proportional-integrator-derivative controller (PID) controller was implemented to regulate the anode voltage and flow rate based on the optical emission of the plume. The PID showcased short settling times from 0.1 to 0.4 s and overshoot levels up to 3% of the target value for the voltage and 10% of the target value for the flow rate. These results were for a fixed coil current at 4A. The study showed that changing the coil current may necessitate more sophisticated prediction models and control strategies. Future work will expand the model’s generalizability to different thruster types, propellants, and magnetic field configurations.

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Brief Review on Measurement Devices for the Plasma Diagnosis of Satellite Electric Propulsion Systems

Kim,

Guk,

Lee

2024

KSS

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A novel optical emission spectroscopy method for diagnostics of contribution of different ionization mechanisms and flux of ions in different valences in discharge channel of a Hall thruster

Cited by 3 publications

References 63 publications

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

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

Analysis and control of Hall effect thruster using optical emission spectroscopy and artificial neural network

Brief Review on Measurement Devices for the Plasma Diagnosis of Satellite Electric Propulsion Systems

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