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Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster

Most of the artificial low-pressure plasmas contact with physical walls in laboratories; the plasma loss at the wall significantly affects the plasma device performance, e.g., an electric propulsion device. Near the surface of the wall, ions are spontaneously accelerated by a sheath and deliver thei...

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Detalles Bibliográficos
Autores principales: Takahashi, Kazunori, Sugawara, Takeharu, Ando, Akira
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6978413/
https://www.ncbi.nlm.nih.gov/pubmed/31974470
http://dx.doi.org/10.1038/s41598-020-58022-6
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author Takahashi, Kazunori
Sugawara, Takeharu
Ando, Akira
author_facet Takahashi, Kazunori
Sugawara, Takeharu
Ando, Akira
author_sort Takahashi, Kazunori
collection PubMed
description Most of the artificial low-pressure plasmas contact with physical walls in laboratories; the plasma loss at the wall significantly affects the plasma device performance, e.g., an electric propulsion device. Near the surface of the wall, ions are spontaneously accelerated by a sheath and deliver their momentum and energy to the wall, while most of the electrons are reflected there. The momentum flux of the ions is a vector field, i.e., having both the radial and axial components even if the azimuthal components are neglected in a cylindrical system. Here the spatially- and vector-resolved measurement of the momentum flux near the cylindrical source wall of a magnetic nozzle radiofrequency (rf) plasma thruster configuration is successfully demonstrated by using a momentum vector measurement instrument. The results experimentally identify the spatial profile of a non-negligible axial momentum flux to the wall, while the radially accelerated ions seem to be responsible for the energy loss to the wall. The spatial profiles of the radial and axial momentum fluxes and the energy lost to the wall are significantly affected by the magnetic field strength. The results contribute to understand how and where the momentum and energy in the artificial plasma devices are lost, in addition to the presently tested thruster.
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spelling pubmed-69784132020-01-30 Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster Takahashi, Kazunori Sugawara, Takeharu Ando, Akira Sci Rep Article Most of the artificial low-pressure plasmas contact with physical walls in laboratories; the plasma loss at the wall significantly affects the plasma device performance, e.g., an electric propulsion device. Near the surface of the wall, ions are spontaneously accelerated by a sheath and deliver their momentum and energy to the wall, while most of the electrons are reflected there. The momentum flux of the ions is a vector field, i.e., having both the radial and axial components even if the azimuthal components are neglected in a cylindrical system. Here the spatially- and vector-resolved measurement of the momentum flux near the cylindrical source wall of a magnetic nozzle radiofrequency (rf) plasma thruster configuration is successfully demonstrated by using a momentum vector measurement instrument. The results experimentally identify the spatial profile of a non-negligible axial momentum flux to the wall, while the radially accelerated ions seem to be responsible for the energy loss to the wall. The spatial profiles of the radial and axial momentum fluxes and the energy lost to the wall are significantly affected by the magnetic field strength. The results contribute to understand how and where the momentum and energy in the artificial plasma devices are lost, in addition to the presently tested thruster. Nature Publishing Group UK 2020-01-23 /pmc/articles/PMC6978413/ /pubmed/31974470 http://dx.doi.org/10.1038/s41598-020-58022-6 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Takahashi, Kazunori
Sugawara, Takeharu
Ando, Akira
Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
title Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
title_full Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
title_fullStr Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
title_full_unstemmed Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
title_short Spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
title_sort spatially- and vector-resolved momentum flux lost to a wall in a magnetic nozzle rf plasma thruster
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6978413/
https://www.ncbi.nlm.nih.gov/pubmed/31974470
http://dx.doi.org/10.1038/s41598-020-58022-6
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