About: Mach probe interpretation in the presence of supra-thermal electrons

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Teorie Machových sond bez srážek mezi částicemi je rozšířena na případ isotropních elektronů s dvěma Maxwellovskými distribucemi o různých teplotách. Kinetické rovnice pro elektrony a iony jsou řešeny kvasi-neutrálním částicovým kódem, jehož výsledky jsou srovnatelné se známými výsledky fluidní teorie a numerických výpočtů. Hlavním výsledkem je pozorovaná vysoká citlivost sondy na přítomnost supra-termálních elektronů. (cs) The collisionless theory of Mach probes assuming isothermal, Maxwellian electrons, is extended to include an isotropic, two-temperature electron distribution function. The kinetic equations for ion and electron motion in the probe wake are solved using a quasineutral particle-in-cell method, which compares qualitatively well with the results of a simple fluid model. We find that the measured Mach number decreases slightly with increasing hot electron concentration, but the main effect is on the measured electron temperature. Due to the fact that the probe is sensitive to even a tiny population of hot electrons, the resulting ion sound speed can be overestimated by up to a factor of two, leading to measurements of absolute flow speed that are too large. The collisionless theory of Mach probes assuming isothermal, Maxwellian electrons, is extended to include an isotropic, two-temperature electron distribution function. The kinetic equations for ion and electron motion in the probe wake are solved using a quasineutral particle-in-cell method, which compares qualitatively well with the results of a simple fluid model. We find that the measured Mach number decreases slightly with increasing hot electron concentration, but the main effect is on the measured electron temperature. Due to the fact that the probe is sensitive to even a tiny population of hot electrons, the resulting ion sound speed can be overestimated by up to a factor of two, leading to measurements of absolute flow speed that are too large. (en)
Title	Mach probe interpretation in the presence of supra-thermal electrons Interpretace Machových sond v přítomnosti supra-termálních elektronů (cs) Mach probe interpretation in the presence of supra-thermal electrons (en)
skos:prefLabel	Mach probe interpretation in the presence of supra-thermal electrons Interpretace Machových sond v přítomnosti supra-termálních elektronů (cs) Mach probe interpretation in the presence of supra-thermal electrons (en)
skos:notation	RIV/61389021:_____/07:00089346!RIV08-AV0-61389021
http://linked.open.../vavai/riv/strany	032501;1
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA202/04/0360), Z(AV0Z20430508)
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2008
http://linked.open...aciTvurceVysledku	Fuchs, Vladimír
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyziky plazmatu AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	431597
http://linked.open...ai/riv/idVysledku	RIV/61389021:_____/07:00089346
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Mach probes; supra-thermal electrons; quasi-neutral PIC codes (en)
http://linked.open.../riv/klicoveSlovo	Mach probes quasi-neutral PIC codes supra-thermal electrons
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[C2FC93D3215E]
http://linked.open...i/riv/nazevZdroje	Physics of Plasmas
http://linked.open...in/vavai/riv/obor	BL
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Dissipation of strong electromagnetic waves and its consequences near antennas
http://linked.open...UplatneniVysledku	2007
http://linked.open...v/svazekPeriodika	14
http://linked.open...iv/tvurceVysledku	Fuchs, Vladimír Gunn, J. P.
http://linked.open...n/vavai/riv/zamer	Physical and chemical processes in plasmas and theis applications
issn	1070-664X
number of pages	17 (xsd:int)
is http://linked.open...avai/riv/vysledek of	Mach probe interpretation in the presence of supra-thermal electrons Mach probe interpretation in the presence of supra-thermal electrons Mach probe interpretation in the presence of supra-thermal electrons

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