Radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters

The subject matter of the article is the radial distribution of electrons movement parameters inside electric propulsion thrusters with closed electrons drift. The radial magnetic field in Hall effect thrusters is the limits the axial flow of electrons because of interaction with azimuth electron cu...

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Autor principal:	Zongshuai Guo
Formato:	article
Lenguaje:	EN RU UK
Publicado:	National Aerospace University «Kharkiv Aviation Institute» 2021
Materias:	hall effect thruster electrons rotation moment velocity distribution function kinetic equation langmuir layer Motor vehicles. Aeronautics. Astronautics TL1-4050
Acceso en línea:	https://doaj.org/article/e23db6a46b024f0aa27082f40a3e20b0
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spelling	oai:doaj.org-article:e23db6a46b024f0aa27082f40a3e20b02021-11-09T07:52:42ZRadial distribution of electrons rotation moment in hall effect and plasma-ion thrusters1727-73372663-221710.32620/aktt.2021.4.04https://doaj.org/article/e23db6a46b024f0aa27082f40a3e20b02021-08-01T00:00:00Zhttp://nti.khai.edu/ojs/index.php/aktt/article/view/1437https://doaj.org/toc/1727-7337https://doaj.org/toc/2663-2217The subject matter of the article is the radial distribution of electrons movement parameters inside electric propulsion thrusters with closed electrons drift. The radial magnetic field in Hall effect thrusters is the limits the axial flow of electrons because of interaction with azimuth electron current. In turn, this azimuth current exists as a result of rivalry between the attempt of the magnetic field to transform electrons current completely closed one and the loss of electrons rotation moment in collisions. Similar processes take place in the ionization chamber of plasma-ion thrusters with the radial magnetic field. The attempts to estimate electrons parameters through only collisions with ions and atoms inside volume have given the value of axial electrons current much lower than really being. This phenomenon is called anomalous electrons conductivity, which was tried to be explained as a consequence of various effects including "near-the-wall-conductivity", which was explained as a result of non-mirror reflection of electrons from the Langmuir layer near the walls of the thruster channel. The disadvantage of this name is the fact that the reflection of the electron occurs before reaching the surface from the potential barrier at the plasma boundary with any environment: the wall, but also with the environment vacuum. The potential distribution in the Langmuir layer is non-stationary and inhomogeneous due to the presence of so-called plasma oscillations. The definition of "conductivity" is just as unfortunate in this name, because the collisions are always not a factor of conductivity, but on the contrary – of resistance. The goal is to solve the task of electrons rotation moment distribution in the thruster channel. The methods used are the formulation of the kinetic equation for electrons distribution function over the velocities, radius, and projections of the coordinates of the instantaneous center of cyclotron rotation; solution of this equation and finding with its use the distribution of the gas-dynamic parameters of electrons along the cross-section of the channel. Conclusions. A mathematical model of electrons rotation moment dynamics is proposed, which allows using plasma-dynamics equations to analyze its distribution along the cross-section of thruster channel and to estimate the effect of "near-the-wall-conductivity" using appropriate boundary conditions.Zongshuai GuoNational Aerospace University «Kharkiv Aviation Institute»articlehall effect thrusterelectrons rotation momentvelocity distribution functionkinetic equationlangmuir layerMotor vehicles. Aeronautics. AstronauticsTL1-4050ENRUUKАвіаційно-космічна техніка та технологія, Vol 0, Iss 4, Pp 28-34 (2021)
institution	DOAJ
collection	DOAJ
language	EN RU UK
topic	hall effect thruster electrons rotation moment velocity distribution function kinetic equation langmuir layer Motor vehicles. Aeronautics. Astronautics TL1-4050
spellingShingle	hall effect thruster electrons rotation moment velocity distribution function kinetic equation langmuir layer Motor vehicles. Aeronautics. Astronautics TL1-4050 Zongshuai Guo Radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters
description	The subject matter of the article is the radial distribution of electrons movement parameters inside electric propulsion thrusters with closed electrons drift. The radial magnetic field in Hall effect thrusters is the limits the axial flow of electrons because of interaction with azimuth electron current. In turn, this azimuth current exists as a result of rivalry between the attempt of the magnetic field to transform electrons current completely closed one and the loss of electrons rotation moment in collisions. Similar processes take place in the ionization chamber of plasma-ion thrusters with the radial magnetic field. The attempts to estimate electrons parameters through only collisions with ions and atoms inside volume have given the value of axial electrons current much lower than really being. This phenomenon is called anomalous electrons conductivity, which was tried to be explained as a consequence of various effects including "near-the-wall-conductivity", which was explained as a result of non-mirror reflection of electrons from the Langmuir layer near the walls of the thruster channel. The disadvantage of this name is the fact that the reflection of the electron occurs before reaching the surface from the potential barrier at the plasma boundary with any environment: the wall, but also with the environment vacuum. The potential distribution in the Langmuir layer is non-stationary and inhomogeneous due to the presence of so-called plasma oscillations. The definition of "conductivity" is just as unfortunate in this name, because the collisions are always not a factor of conductivity, but on the contrary – of resistance. The goal is to solve the task of electrons rotation moment distribution in the thruster channel. The methods used are the formulation of the kinetic equation for electrons distribution function over the velocities, radius, and projections of the coordinates of the instantaneous center of cyclotron rotation; solution of this equation and finding with its use the distribution of the gas-dynamic parameters of electrons along the cross-section of the channel. Conclusions. A mathematical model of electrons rotation moment dynamics is proposed, which allows using plasma-dynamics equations to analyze its distribution along the cross-section of thruster channel and to estimate the effect of "near-the-wall-conductivity" using appropriate boundary conditions.
format	article
author	Zongshuai Guo
author_facet	Zongshuai Guo
author_sort	Zongshuai Guo
title	Radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters
title_short	Radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters
title_full	Radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters
title_fullStr	Radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters
title_full_unstemmed	Radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters
title_sort	radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters
publisher	National Aerospace University «Kharkiv Aviation Institute»
publishDate	2021
url	https://doaj.org/article/e23db6a46b024f0aa27082f40a3e20b0
work_keys_str_mv	AT zongshuaiguo radialdistributionofelectronsrotationmomentinhalleffectandplasmaionthrusters
_version_	1718441253701419008

Radial distribution of electrons rotation moment in hall effect and plasma-ion thrusters

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