Influence of Xe2+ ions on the micro-hollow cathode discharge driven by thermionic emission

Levko, Dmitry; Bliokh, Yu. P.; Krasik, Ya. E.

doi:10.1063/1.4871487

Cited by 9 publications

(13 citation statements)

References 20 publications

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“…The experimental setup enabled continuous arc discharge in the hollow cathode with specified inlet mass flow rate (17) and anode and keeper current (10). In these experiments, anode voltage and gas pressure inside the cathode tube were measured.…”

Section: Resultsmentioning

confidence: 99%

“…In [9] and [10], it was noted that the main disadvantages of fluid models [3]- [8] were assumption about non-Maxwellian electron energy distribution function (EEDF) and simplified plasma-chemical model of discharge in xenon that did not account for processes with molecular xenon ions. The results of the simulations in [9] and [10] were compared with the results of 2-D fluid models [3]- [8]. It was shown that EEDF significantly deviates from the Maxwellian one, and the presence of the second ion specie increases plasma density.…”

Section: Introductionmentioning

confidence: 99%

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2-D Modeling of Orificed Hollow Cathodes of Stationary Plasma Thrusters SPT-100

Liu

Ning

et al. 2015

IEEE Trans. Plasma Sci.

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In this paper, 2-D extended fluid model for the simulation of orificed hollow cathode (OHC) discharge in xenon flow of SPT-100 thruster was built using Comsol Multiphysics. Self-consistent discharge model is based on fluid description of ions and excited neutral species and uses drift-diffusion approximation for the particle fluxes. Electron transport and rates of electron-induced plasma-chemical reactions are calculated using Boltzmann equation for electron energy distribution function and corresponding collision cross sections. A reasonable set of plasma-chemical processes with electrons, ions, and excited and neutral particles were considered. The model accounts for gas flow and heating. Self-consistent electric field is calculated from the Poisson equation. The model geometry reproduces that of the experimental OHC for stationary plasma thruster SPT-100, which was studied in Harbin Institute of Technology. Simulations were carried out for different operational modes of the OHC. Distributions of key discharge parameters were obtained. A comparison between the simulation results and experimental data was conducted and showed good agreement.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

2-D Modeling of Orificed Hollow Cathodes of Stationary Plasma Thrusters SPT-100

Liu

Ning

et al. 2015

IEEE Trans. Plasma Sci.

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“…The PIC-MCC is based on first principles and minimizes the number of assumptions made on the calculation [38]. This method has been widely employed in the analysis of various kinds of plasma discharge such as direct-current driven microdischarges [39,40], dielectric barrier discharge [41], micro-hollow cathode discharges [35,[42][43][44] etc. The PIC-MCC method proceeds as follows: first, the distributions of some 'macro particles' that represent a large number of real charged particles determines the charge-current density in the computational domain; second, we can accumulate the particle charge or current to grids, thus electromagnetic field in the plasma can be obtained by solving Maxwell equations; then the velocities and positions of all particles are updated based on the electric field and magnet field using the leap-frog algorithm [45], during which the collisions between particles and boundary conditions are dealt with; finally, plasma parameters such as particle number densities and plasma potential can be obtained, and the overall motion of the plasma is obtained by the sum of all particle orbits.…”

Section: Pic-mcc Modelmentioning

confidence: 99%

Numerical investigation of plasma behavior in a micro DC ion thruster using the particle-in-cell/Monte Carlo collision (PIC/MCC) method

Liu¹,

Cai²,

Zhang³

et al. 2021

J. Phys. D: Appl. Phys.

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Micro direct current (DC) ion thruster has advantages of small volume, light weight and significantly improved specific impulse performance compared to conventional chemical propulsion systems, thus having a wide application prospect in the tasks of cube-satellites and micro satellite networking systems. In this paper, a two-dimensional axisymmetric particle-in-cell/Monte Carlo collision model for the discharge chamber is developed for a micro DC ion thruster, which adopt the real configuration of original MiXI thruster with ring-cusp magnetic field. This model takes the thermal electron emission including the Schottky effect, various collision processes and the uneven background gas density distribution in the cathode-anode gap into account. The transient discharge process and the influence of operating conditions on the discharge process in the ionization chamber are presented for the first time so as to provide a detailed understanding of transport characteristics of plasma associated with the DC discharge process. Our calculated properties are compared with literature experimental data under similar conditions and qualitative and quantitative agreements are reached. The leak widths for charged species are obtained and closely related to charge separation. The simulations indicate that low neutral flow rate may lead to a discharge instability accompanied with oscillation of plasma quantities. These results lay a foundation for further optimization of thruster discharge chamber design in the future.

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“…Both of these also agree with the expectations of the theory. Other PIC simulations in mixtures have been conducted at conditions where two-stream instabilities are not predicted to occur in the presheath [37,38] (see [9] for an analysis of the stability conditions). In both of these cases, the ion speeds were observed to be the individual sound speed at the sheath edge, which is also consistent with the theory.…”

Section: Transport Effectsmentioning

confidence: 99%

Influence of ion streaming instabilities on transport near plasma boundaries

Baalrud

2016

Plasma Sources Sci. Technol.

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Plasma boundary layers are susceptible to electrostatic instabilities driven by ion flows in presheaths and, when present, these instabilities can influence transport. In plasmas with a single species of positive ion, ion-acoustic instabilities are expected under conditions of low pressure and large electron-to-ion temperature ratio (T e /T i 1). In plasmas with two species of positive ions, ion-ion two-stream instabilities can also be excited. The stability phase-space is characterized using the Penrose criterion and approximate linear dispersion relations. Predictions for how these instabilities affect ion and electron transport in presheaths, including rapid thermalization due to instability-enhanced collisions and an instability-enhanced ion-ion friction force, are also briefly reviewed. Recent experimental tests of these predictions are discussed along with research needs required for further validation. The calculated stability boundaries provide a guide to determine the experimental conditions at which these effects can be expected.

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Influence of Xe2+ ions on the micro-hollow cathode discharge driven by thermionic emission

Cited by 9 publications

References 20 publications

2-D Modeling of Orificed Hollow Cathodes of Stationary Plasma Thrusters SPT-100

2-D Modeling of Orificed Hollow Cathodes of Stationary Plasma Thrusters SPT-100

Numerical investigation of plasma behavior in a micro DC ion thruster using the particle-in-cell/Monte Carlo collision (PIC/MCC) method

Influence of ion streaming instabilities on transport near plasma boundaries

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