Two-dimensional effects on electrostatic instabilities in Hall thrusters. II. Comparison of particle-in-cell simulation results with linear theory dispersion relations

Petronio, Federico; Charoy, Thomas; Laguna, Alejandro Alvarez; Bourdon, Anne; Chabert, Pascal

doi:10.1063/5.0119255

Cited by 4 publications

(1 citation statement)

References 59 publications

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“…Therefore, one important area of research to focus on is how discharge voltage affects the Hall propulsion system's performance. [6] B. Magnetic Field Strength: Hall thrusters create magnetic field through electromagnetic coils.…”

Section: ) Secondary Electron Emissionmentioning

confidence: 99%

Designing of Light Weight Hall Thrusters with Key Discharge Parameters

Kanagaraj

2024

IJRASET

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A study was conducted to design and fabricate a light-weight Hall thruster with all key discharge parameters. Hall thrusters are firmly used as the primary electric propulsion in the current field of space propulsion. The concepts of electric and magnetic fields are studied to improve the thrust and specific impulse of the light-weight Hall thruster. This model is intended to work within a range for certain near-Earth missions. The Hall thruster is designed in CAD software with all the required parts, dimensions and the materials that had to be used for its light weight consideration. The compact Hall thruster’s key discharge parameters are discussed and designed accordingly in order to produce a higher thrust-to-power ratio.

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Section: ) Secondary Electron Emissionmentioning

confidence: 99%

Designing of Light Weight Hall Thrusters with Key Discharge Parameters

Kanagaraj

2024

IJRASET

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Two-dimensional effects on electrostatic instabilities in Hall thrusters. I. Insights from particle-in-cell simulations and two-point power spectral density reconstruction techniques

et al. 2023

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Using 2D particle-in-cell (PIC) simulations coupled to a fluid description of the gas dynamics, we study the electrostatic instabilities developing in the axial–azimuthal plane of a Hall thruster, during several periods of a low-frequency oscillation (the so-called breathing mode at [Formula: see text]). As done in experiments, the 2D PIC-MCC (Monte Carlo collision) code is coupled to an electrical circuit in order to partially damp the (otherwise large) discharge current fluctuations at the breathing mode frequency. The different electrostatic higher frequency modes that develop in the plasma are analyzed using a two-point power spectral density reconstruction method, which allows us to generate the dispersion diagrams (in the frequency-wavenumber space) along the axial and azimuthal directions and at different times during the low-frequency breathing mode oscillations. This technique allows us to distinguish between different well-identified instabilities: the electron cyclotron drift instability and its evolution toward an ion acoustic wave and the ion transit time instability. These instabilities are usually considered unidirectional (either axial or azimuthal); however, it is shown here that they exist in both directions. This two-dimensional character is instrumental in understanding where these instabilities grow and how they propagate in the thruster channel and plume. A theoretical discussion of this aspect is proposed in Paper II. The effects of (i) the azimuthal length of the simulation box and (ii) the electron temperature injection at the cathode are also discussed.

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Study of the breathing mode development in Hall thrusters using hybrid simulations

Petronio,

Alvarez Laguna,

Bourdon

et al. 2024

Journal of Applied Physics

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We use a 2.5D hybrid simulation to study the breathing mode (BM) dynamics in Hall thrusters (HTs). This involves a 1D Euler fluid simulation for neutral dynamics in the axial direction, coupled with a 2D axial–azimuthal Particle-in-Cell (PIC) simulation for charged species. The simulation also includes an out-of-plane virtual dimension for wall losses. This setup allows us to replicate the BM’s macroscopic features observed in experiments. A comprehensive analysis of plasma parameters in BM’s phases divides it into two growth and two decay sub-phases. Examining 1D axial profiles of electron temperature, gas and plasma densities, and particle creation rate shows that an increase in electron temperature alone cannot sustain ionization. Ionization seems to be influenced by the spatial correlation between electron and gas densities and the ionization rate coefficient. Investigating ion back-flow reveals its impact on modulating neutral flux entering the ionization region. The hybrid simulation’s outcomes let us assess the usual 0D predator–prey model’s validity and identify its limitations. The ionization and ion convection term approximations hold, but the gas convective term approximation does not. Introducing an alternative gas convective term approximation involving constant density ejection from the ionization region constructs an unstable BM model consistent with simulation results. In addition, this paper explores how varying the imposed voltage and mass flow rate impacts the BM. The BM frequency increases with imposed voltage, aligning with theoretical predictions. The mass flow rate variation has a limited effect on BM frequency, following the theoretical model’s trend.

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Two-dimensional effects on electrostatic instabilities in Hall thrusters. II. Comparison of particle-in-cell simulation results with linear theory dispersion relations

Cited by 4 publications

References 59 publications

Designing of Light Weight Hall Thrusters with Key Discharge Parameters

Designing of Light Weight Hall Thrusters with Key Discharge Parameters

Two-dimensional effects on electrostatic instabilities in Hall thrusters. I. Insights from particle-in-cell simulations and two-point power spectral density reconstruction techniques

Study of the breathing mode development in Hall thrusters using hybrid simulations

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