Measurements of relative erosion rate of ceramic insulators in Hall thruster with external layer using low-temperature plasma spectral analysis

A specific operating mode was observed for Hall thrusters in the power range up to 5 kW when at least one of the following changes occurred: a decrease in gas flow rate, an increase in magnetic field magnitude, an extension of ceramics or a change in ceramics properties. The thruster operating in th...

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Bibliographic Details
Main Authors: Kravchenko, Dmitrii, Kriviruchko, Dariya, Shashkov, Andrey, Khmelevskoi, Ivan
Format: Conference Proceeding
Language:English
Subjects:
Acceleration
Boron nitride
Ceramics
Diameters
Erosion rates
Flow velocity
Gas flow
Hall thrusters
Insulators
Low temperature
Maximum power
Spectrum analysis
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Summary:A specific operating mode was observed for Hall thrusters in the power range up to 5 kW when at least one of the following changes occurred: a decrease in gas flow rate, an increase in magnetic field magnitude, an extension of ceramics or a change in ceramics properties. The thruster operating in the observed mode has total efficiency from 5 to 20% lower than in the design mode. In this paper, relative erosion rate of boron nitride (BN) ceramics was measured for a Hall thruster with external ionization and acceleration region for both operating modes using passive spectral analysis. The Hall thruster has middle line diameter of 77mm and maximum power up to 2.5 kW. Estimations of the relative erosion rate were based on boron doublet linewith wavelengths of 249.677 and 249.773 nm. During the study, discharge voltage range was from 400 to 1000 V, mas flow rate range was from 2 to 6 mg/s. It was shown that the relative erosion rate for all operating conditions is lower for the operating mode with lower efficiency for chosen thruster.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5135486