Particularities of ignition of the non-self-sustained discharge with a thermoemission cathode in crossed fields

Ermilov, A. N.; Eroshenkov, V. F.; Kovalenko, Yu. A.; Korolev, S. V.; Chernyshov, T. V.; Shumilin, A. P.

doi:10.1134/s0018151x13040081

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…However, few experimental data [14,63] demonstrate very intense light emission as well as the high current peak. We observed the same phenomena in our preview experiments [15] as well as a strong diamagnetic effect [16]. Thus, the results of the simulation appear to be legitimate.…”

Section: Discharge Ignitionsupporting

confidence: 81%

“…Electron emission current was constant during the whole simulation, I em = 20 A. This value was selected to maintain maximum emission current measured before in the experiments [15,16]. Relevant emission current for low-temperature ions was I em m/M ≈ 40 mA.…”

Section: Conditions and Assumptionsmentioning

confidence: 99%

“…However, there are few processes where the diamagnetic effect can be significant. For instance, ignition of discharge is accompanied by a high current that is an order of magnitude greater than steady-state value [14][15][16]. Other examples are regimes with a very high level of current oscillations.…”

Section: Introductionmentioning

confidence: 99%

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2D3V kinetic simulation of Hall effect thruster, including azimuthal waves and diamagnetic effect

Chernyshev

Сон

Gorshkov

2019

J. Phys. D: Appl. Phys.

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Axial-azimuthal (2D3V) full-kinetic PiC+MCC-model was built to simulate dynamics of Hall effect thruster discharge plasma taking into account azimuthal waves and diamagnetic effect. The transition from ignition to the steady-state regime was simulated. Calculation of discharge ignition shows a significant distortion in the shape of the magnetic field caused by high azimuthal-drift current. This effect and intensive ionization lead to the fact that full potential drop localizes in a thin non-magnetized cathode layer. In the steady-state regime, the distortion of the magnetic field is small. Plasma divides into three regions: dense anode plasma where ionization occurs; magnetic layer where ions accelerate and quasineutral cathodeside plasma (plume). The steady-state regime is subject to auto-oscillations at a gas-transit frequency (20 kHz 'breathing modes'). Also, two types of azimuthal instabilities have been observed: gradient drift instability and electron cyclotron instability. All these instabilities lead to collisionless 'anomalous' electron transport across the magnetic field. Kinetic effects also were considered. It was found that the electron distribution function evolves from initial isotropic (Maxwellian) to essentially anisotropic due to electric field heating. Isotropy is partially restored inside anode plasma due to collisions.

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Section: Discharge Ignitionsupporting

confidence: 81%

Section: Conditions and Assumptionsmentioning

confidence: 99%

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2D3V kinetic simulation of Hall effect thruster, including azimuthal waves and diamagnetic effect

Chernyshev

Сон

Gorshkov

2019

J. Phys. D: Appl. Phys.

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“…This is because they have longevity, are efficient and offer high current density. Sometimes, however, simple planar thermionic cathodes (TCs) or even hot filaments are used in on-ground experiments [44][45][46][47]. These devices were selected because they generate little or no internal noise TCs are also widely used when HET-like devices are operated as a technological source of ions.…”

Section: Local Structure Of Discharge and Violation Of Quasi-neutralitymentioning

confidence: 99%

On a force balance and role of cathode plasma in Hall effect thrusters

Chernyshev¹,

Krivoruchko²

2022

Plasma Sources Sci. Technol.

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The cathode plasma is a specific transition region in the Hall Effect Thruster (HET) discharge that localizes between the strongly magnetized acceleration layer (magnetic layer or B-layer) and non-magnetized exhaust plume. Cathode plasma provides a flow of electron current that supplies losses in the magnetic layer (due to ionization, excitation, electron-wall interactions, etc.). The electrons' transport in this region occurs in collisionless mode through the excitation of plasma instabilities. This effect is also known as "anomalous transport/conductivity". In this work, we present the results of a 2d (drift-plane) kinetic simulation of the HET discharge, including the outside region that contains cathode plasma. We discuss the process of cathode plasma formation and the mechanisms of "anomalous transport" inside it. We also analyze how fluid force balance emerges from collisionless kinetic approach. The acceleration mechanism in Hall Effect Thrusters (HETs) is commonly described in terms of force balance. Namely, the reactive force produced by accelerated ions has the same value as Ampère's force acting on a drift current loop. This balance written in integral form provides the basis for quantitative estimations of HETs' parameters and scaling models.

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Jumping the anode layer in the zone of the E × B discharge

et al. 2019

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New features and peculiarities of anomalous self-sustained Hall E × B discharge have been discovered. The presence of a minimum density of ions n upon the magnetic field induction B is confirmed for a wide range of discharge parameters. Likewise, the operation mode for a maximum density at the optimal values of the radial and longitudinal components of magnetic induction was discovered. Both effects are accompanied by the changes in the position of the combustion zone E × B of the discharge in the anode-cathode interval and the transformation of the distribution function of the ion energy. The threshold nature of the processes in the plasma E × B of the discharge can be manifested on the curves n = f(B) as an abrupt 3 to 4 times decrease in density upon the increase in B by not more than 10%. An abrupt increase in the density of ions (up to 16 times), occurring with a slight increase in the density of neutrals (∼1.2 times), is recorded when there are jumps of the anode layer from the anode region to the cathode one and vice versa. A thin structure of ion energy spectra explained by the isomagnetic potential jumps, which generate ion density jumps in a narrow energy range, was found. In the search for the reasons for the restructuring of the discharge and generation of isomagnetic jumps, the possible effect of nonlocal gradient-drift and electron-cyclotron drift instabilities on electron mobility and ion acceleration is briefly discussed.

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Particularities of ignition of the non-self-sustained discharge with a thermoemission cathode in crossed fields

Cited by 7 publications

References 3 publications

2D3V kinetic simulation of Hall effect thruster, including azimuthal waves and diamagnetic effect

2D3V kinetic simulation of Hall effect thruster, including azimuthal waves and diamagnetic effect

On a force balance and role of cathode plasma in Hall effect thrusters

Jumping the anode layer in the zone of the E × B discharge

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