About: Direct plasma potential measurements by a novel probe

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	V článku je navržena metoda pro přímé měření potenciálu plazmatu pomocí nové sondy. Princip měření je založen na zredukování elektronového nasyceného proudu na sondu, tak aby byl přibližně roven iontovému nasycenému proudu. V takovém případě je podle Langmuirovy teorie plovoucí potenciál sondy roven potenciálu plazmatu. První systematická měření byla provedena na tokamku CASTOR. (cs) For the determination of the plasma potential in tokamaks emissive probes and heavy ion beam probes have been used, but these diagnostics are still not used as a routine technique. In practice the floating potential Vfl is usually measured by Langmuir probes. The plasma potential Fpl is then derived from the simple formula of the Langmuir probe theory (without magnetic field): Vfl = Fpl - Te ln(Ri), where Te is the electron temperature in eV. The quantity Ri represents the ratio of the electron and ion saturation currents: Ri = . The theoretical value of ln(Ri) in hydrogen plasma is about 2.5. The basic idea of the direct plasma potential measurements is to adjust Ri equal to one. If this can be achieved, the floating potential of the probe is equal to the plasma potential. This contribution presents the design as well as the first experimental results of a novel probe, by which the value of Ri can be modified. The probe head, shown in the figure, consists of a conically shaped col... For the determination of the plasma potential in tokamaks emissive probes and heavy ion beam probes have been used, but these diagnostics are still not used as a routine technique. In practice the floating potential Vfl is usually measured by Langmuir probes. The plasma potential Fpl is then derived from the simple formula of the Langmuir probe theory (without magnetic field): Vfl = Fpl - Te ln(Ri), where Te is the electron temperature in eV. The quantity Ri represents the ratio of the electron and ion saturation currents: Ri = . The theoretical value of ln(Ri) in hydrogen plasma is about 2.5. The basic idea of the direct plasma potential measurements is to adjust Ri equal to one. If this can be achieved, the floating potential of the probe is equal to the plasma potential. This contribution presents the design as well as the first experimental results of a novel probe, by which the value of Ri can be modified. The probe head, shown in the figure, consists of a conically shaped col... (en)
Title	Direct plasma potential measurements by a novel probe Přímé měření potenciálu plazmatu pomocí nové sondy (cs) Direct plasma potential measurements by a novel probe (en)
skos:prefLabel	Direct plasma potential measurements by a novel probe Přímé měření potenciálu plazmatu pomocí nové sondy (cs) Direct plasma potential measurements by a novel probe (en)
skos:notation	RIV/61389021:_____/04:00103225!RIV/2005/AV0/A52005/N
http://linked.open.../vavai/riv/strany	514;515
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA202/03/0786), Z(AV0Z2043910)
http://linked.open...vai/riv/dodaniDat	2005
http://linked.open...aciTvurceVysledku	Stöckel, Jan Hron, Martin Adámek, Jiří Ryszawy, Jiří
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
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	560722
http://linked.open...ai/riv/idVysledku	RIV/61389021:_____/04:00103225
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	tokamak, probe (en)
http://linked.open.../riv/klicoveSlovo	tokamak probe
http://linked.open...ontrolniKodProRIV	[D8735E8A02A9]
http://linked.open...v/mistoKonaniAkce	London
http://linked.open...i/riv/mistoVydani	London
http://linked.open...i/riv/nazevZdroje	Proceedings of the 31th EPS Conference on Controlled Fusion and Plasma Physics
http://linked.open...in/vavai/riv/obor	BL
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	10 (xsd:int)
http://linked.open...vavai/riv/projekt	3D structure of the edge turbulence and its control on the Castor tokamak
http://linked.open...UplatneniVysledku	2004
http://linked.open...iv/tvurceVysledku	Adámek, Jiří Stöckel, Jan Hron, Martin Schrittwieser, R. Tichý, M. Ionita, C. Martines, E. Van Oost, G. Ryszawy, Jiří Balan, P.
http://linked.open...vavai/riv/typAkce	WRD - Světová
http://linked.open.../riv/zahajeniAkce	2004-06-28 (xsd:date)
http://linked.open...n/vavai/riv/zamer	Generování a diagnostika různých typů plazmatu a jejich interakce s ostatními skupenstvími hmoty
number of pages	2 (xsd:int)
http://purl.org/ne...btex#hasPublisher	Neuveden

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