Plasmas generated by ultra-violet light rather than electron impact
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.13/4546 |
Resumo: | We analyze, in both plane and cylindrical geometries, a collisionless plasma consisting of an inner region where generation occurs by UV illumination, and an un-illuminated outer region with no generation. Ions generated in the inner region flow outwards through the outer region and into a wall. We solve for this system's steady state, first in the quasi-neutral regime (where the Debye length ${\lambda}_D$ vanishes and analytic solutions exist) and then in the general case, which we solve numerically. In the general case a double layer forms where the illuminated and un-illuminated regions meet, and an approximately quasi-neutral plasma connects the double layer to the wall sheath; in plane geometry the ions coast through the quasi-neutral section at slightly more than the Bohm speed $c_s$. The system, although simple, therefore has two novel features: a double layer that does not require counter-streaming ions and electrons, and a quasi-neutral plasma where ions travel in straight lines with at least the Bohm speed. We close with a pr\'{e}cis of our asymptotic solutions of this system, and suggest how our theoretical conclusions might be extended and tested in the laboratory. |
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Plasmas generated by ultra-violet light rather than electron impactPlasmasUltra-violet lightElectron impact.Faculdade de Ciências Exatas e da EngenhariaWe analyze, in both plane and cylindrical geometries, a collisionless plasma consisting of an inner region where generation occurs by UV illumination, and an un-illuminated outer region with no generation. Ions generated in the inner region flow outwards through the outer region and into a wall. We solve for this system's steady state, first in the quasi-neutral regime (where the Debye length ${\lambda}_D$ vanishes and analytic solutions exist) and then in the general case, which we solve numerically. In the general case a double layer forms where the illuminated and un-illuminated regions meet, and an approximately quasi-neutral plasma connects the double layer to the wall sheath; in plane geometry the ions coast through the quasi-neutral section at slightly more than the Bohm speed $c_s$. The system, although simple, therefore has two novel features: a double layer that does not require counter-streaming ions and electrons, and a quasi-neutral plasma where ions travel in straight lines with at least the Bohm speed. We close with a pr\'{e}cis of our asymptotic solutions of this system, and suggest how our theoretical conclusions might be extended and tested in the laboratory.American Institute of PhysicsDigitUMaFranklin, R. N.Allen, J. E.Thomas, D. M.Benilov, M. S.2022-09-01T13:35:45Z2013-12-02T00:00:00Z2013-12-02T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/4546engFranklin, R. N., Allen, J. E., Thomas, D. M., & Benilov, M. S. (2013). Plasmas generated by ultra-violet light rather than electron impact. Physics of Plasmas, 20(12), 123508. DOI: 10.1063/1.484871510.1063/1.4848715info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-09-05T12:57:53Zoai:digituma.uma.pt:10400.13/4546Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:08:40.441162Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Plasmas generated by ultra-violet light rather than electron impact |
title |
Plasmas generated by ultra-violet light rather than electron impact |
spellingShingle |
Plasmas generated by ultra-violet light rather than electron impact Franklin, R. N. Plasmas Ultra-violet light Electron impact . Faculdade de Ciências Exatas e da Engenharia |
title_short |
Plasmas generated by ultra-violet light rather than electron impact |
title_full |
Plasmas generated by ultra-violet light rather than electron impact |
title_fullStr |
Plasmas generated by ultra-violet light rather than electron impact |
title_full_unstemmed |
Plasmas generated by ultra-violet light rather than electron impact |
title_sort |
Plasmas generated by ultra-violet light rather than electron impact |
author |
Franklin, R. N. |
author_facet |
Franklin, R. N. Allen, J. E. Thomas, D. M. Benilov, M. S. |
author_role |
author |
author2 |
Allen, J. E. Thomas, D. M. Benilov, M. S. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
DigitUMa |
dc.contributor.author.fl_str_mv |
Franklin, R. N. Allen, J. E. Thomas, D. M. Benilov, M. S. |
dc.subject.por.fl_str_mv |
Plasmas Ultra-violet light Electron impact . Faculdade de Ciências Exatas e da Engenharia |
topic |
Plasmas Ultra-violet light Electron impact . Faculdade de Ciências Exatas e da Engenharia |
description |
We analyze, in both plane and cylindrical geometries, a collisionless plasma consisting of an inner region where generation occurs by UV illumination, and an un-illuminated outer region with no generation. Ions generated in the inner region flow outwards through the outer region and into a wall. We solve for this system's steady state, first in the quasi-neutral regime (where the Debye length ${\lambda}_D$ vanishes and analytic solutions exist) and then in the general case, which we solve numerically. In the general case a double layer forms where the illuminated and un-illuminated regions meet, and an approximately quasi-neutral plasma connects the double layer to the wall sheath; in plane geometry the ions coast through the quasi-neutral section at slightly more than the Bohm speed $c_s$. The system, although simple, therefore has two novel features: a double layer that does not require counter-streaming ions and electrons, and a quasi-neutral plasma where ions travel in straight lines with at least the Bohm speed. We close with a pr\'{e}cis of our asymptotic solutions of this system, and suggest how our theoretical conclusions might be extended and tested in the laboratory. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-12-02T00:00:00Z 2013-12-02T00:00:00Z 2022-09-01T13:35:45Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.13/4546 |
url |
http://hdl.handle.net/10400.13/4546 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Franklin, R. N., Allen, J. E., Thomas, D. M., & Benilov, M. S. (2013). Plasmas generated by ultra-violet light rather than electron impact. Physics of Plasmas, 20(12), 123508. DOI: 10.1063/1.4848715 10.1063/1.4848715 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
American Institute of Physics |
publisher.none.fl_str_mv |
American Institute of Physics |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799129954774941696 |