Collisional effects in non-stationary plasma expansions along convergent-divergent magnetic nozzles

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Show simple item record Zhou, Jiewei Sánchez Arriaga, Gonzalo Ahedo Galilea, Eduardo Antonio Martinez-Sánchez, M. Ramos, Jesús José 2019-01-08T13:14:55Z 2019-01-08T13:14:55Z 2018-05
dc.identifier.bibliographicCitation Space Propulsion Conference 2018 (SP 2018)
dc.description Proceeding of: Space Propulsion Conference, SP 2018,14-18 mayo, Sevilla
dc.description.abstract The electron-electron collisional effect on the nonstationary expansion of a plasma in a convergentdivergent magnetic nozzle is studied. Under paraxial and fully magnetized plasmas approximations, an Eulerian code has been adapted to solve Poisson's equation coupled with the kinetic transport equations for plasma species, i.e. a Vlasov equation for singly-charged ions and a Boltzmann equation with a Bhatnagar-Gross-Kook operator for electrons. The study is focused on weakly collisional plasma plumes, which have a collisional time scale larger than the transit time in the nozzle of typical electrons. A kinetic analysis shows that phasespace regions of isolated, doubly-trapped electrons that are nearly empty in the collisionless case are progressively populated due to the electron-electron collisions. Such a higher density of trapped electrons modifies the profile of the electrostatic potential, which keeps almost unaltered the density of free electrons and decreases the density of the reflected ones. As compared with the collisionless case, the collisions decrease the length of the downstream sheath and the parallel electron temperature while increasing the normal one. Therefore the steady plasma state is more isotropic. The simulations show that collisions erase the time history of the system and, unlike the collisionless case, the steady state is unique.
dc.description.sponsorship J.Z. was supported by Airbus DS (Grant CW240050). G.S-A was supported by the Ministerio de Economíıa y Competitividad of Spain (Grant RYC-2014-15357). E.A. was supported by the MINOTOR project, that received funding from the European Union’s Horizon2020 research and innovation programme,under grant agreement 730028. J.R. and M.M-S stays at UC3M for this research were supported by a UC3M-SantanderChair of Excellence and by National R&D Plan (Grant ESP2016-75887), respectively.
dc.format.extent 7
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject.other Magnetic nozzles
dc.subject.other Boltzmann equation
dc.subject.other Weakly collisional plasmas
dc.title Collisional effects in non-stationary plasma expansions along convergent-divergent magnetic nozzles
dc.type conferenceObject
dc.subject.eciencia Aeronáutica
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.eventdate 2018-05-14
dc.relation.eventplace Sevilla
dc.relation.eventtitle Space Propulsion Conference 2018 (SP 2018)
dc.relation.eventtype proceeding
dc.identifier.uxxi CC/0000028382
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