Kinetic features and non-stationary electron trapping in paraxial magnetic nozzles

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dc.contributor.author Sánchez Arriaga, Gonzalo
dc.contributor.author Zhou, Jiewei
dc.contributor.author Ahedo Galilea, Eduardo Antonio
dc.contributor.author Martínez Sánchez, Manuel
dc.contributor.author Ramos, Jesús José
dc.date.accessioned 2018-10-25T10:45:10Z
dc.date.accessioned 2018-10-26T07:51:57Z
dc.date.available 2019-03-01T23:00:05Z
dc.date.issued 2018-03
dc.identifier.bibliographicCitation Plasma sources science and technology, 27(3, 035002), pp. 1-13
dc.identifier.issn 0963-0252
dc.identifier.issn 1361-6595
dc.identifier.uri http://hdl.handle.net/10016/27636
dc.description.abstract The paraxial expansion of a collisionless plasma jet into vacuum, guided by a magnetic nozzle, is studied with an Eulerian and non-stationary Vlasov&-Poisson solver. Parametric analyzes varying the magnetic field expansion rate, the size of the simulation box, and the electrostatic potential fall are presented. After choosing the potential fall leading to a zero net current beam, the steady states of the simulations exhibit a quasi-neutral region followed by a downstream sheath. The latter, an unavoidable consequence of the finite size of the computational domain, does not affect the quasineutral region if the box size is chosen appropriately. The steady state presents a strong decay of the perpendicular temperature of the electrons, whose profile versus the inverse of the magnetic field does not depend on the expansion rate within the quasi-neutral region. As a consequence, the electron distribution function is highly anisotropic downstream. The simulations revealed that the ions reach a higher velocity during the transient than in the steady state and their distribution functions are not far from mono-energetic. The density percentage of the population of electrons trapped during the transient, which is computed self-consistently by the code, is up to 25% of the total electron density in the quasi-neutral region. It is demonstrated that the exact amount depends on the history of the system and the steady state is not unique. Nevertheless, the amount of trapped electrons is smaller than the one assumed heuristically by kinetic stationary theories.
dc.description.sponsorship G.S-A was supported by the Ministerio de Economía y Competitividad of Spain (Grant RYC-2014-15357). J.Z. was supported by Airbus DS (Grant CW240050). J.R. and M.M-S stays at UC3M for this research were supported by a UC3M-Santander Chair of Excellence and by National R&D Plan (Grant ESP2016-75887), respectively. E.A. was supported by the MINOTOR project, that received funding from the European Unions Horizon 2020 research and innovation programme, under grant agreement 730028.
dc.format.extent 13
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher IOP
dc.rights © 2018 IOP Publishing Ltd.
dc.subject.other Electric propulsion
dc.subject.other Magnetic nozzles
dc.subject.other Electron trapping
dc.title Kinetic features and non-stationary electron trapping in paraxial magnetic nozzles
dc.type article
dc.subject.eciencia Aeronáutica
dc.subject.eciencia Electrónica
dc.identifier.doi https://doi.org/10.1088/1361-6595/aaad7f
dc.rights.accessRights openAccess
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/730028
dc.relation.projectID Gobierno de España. RYC-2014-15357
dc.relation.projectID Gobierno de España. ESP2016-75887
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationissue 3 (035002)
dc.identifier.publicationlastpage 13
dc.identifier.publicationtitle Plasma sources science and technology
dc.identifier.publicationvolume 27
dc.identifier.uxxi AR/0000021328
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