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Statements

Subject Item
n2:RIV%2F61389021%3A_____%2F05%3A00029733%21RIV06-AV0-61389021
rdf:type
skos:Concept n15:Vysledek
dcterms:description
Přenos energie mezi toky v plazmatu, kolmými k siločarám magnetického pole, a turbulencí byl zkoumán v okrajovém plazmatu tokamaku JET. Získaná turbulentní viskozita dává hodnoty obdobné anamální difuzivitě, rychlost přenosu energie je srovnatelná se střední kinetickou energií normalizovanou na korelační dobu turbulence. Výsledek poprvé ukazuje na duální roli turbulence jako prostředku tlumení turbulence i jako jejího buzení. The energy transfer between perpendicular flows and turbulence has been investigated in the JET plasma boundary region. The energy transfer from DC flows to turbulence, directly related with the momentum flux (e.g. <vq vr>) and the radial gradient in the flow, can be both positive and negative in the proximity of sheared flows. The direct computation of the turbulent viscosity gives values comparable to the anomalous particle diffusivity (in the order of 1m2/s). Furthermore, this energy transfer rate is comparable with the mean flow kinetic energy normalized to the correlation time of turbulence, implying that this energy transfer is significant. These results show, for the first time, the dual role of turbulence as a damping (eddy viscosity) and driving of flows in fusion plasmas emphasizing the important role of turbulence to understand perpendicular dynamics in the plasma boundary region of fusion plasmas. The energy transfer between perpendicular flows and turbulence has been investigated in the JET plasma boundary region. The energy transfer from DC flows to turbulence, directly related with the momentum flux (e.g. <vq vr>) and the radial gradient in the flow, can be both positive and negative in the proximity of sheared flows. The direct computation of the turbulent viscosity gives values comparable to the anomalous particle diffusivity (in the order of 1m2/s). Furthermore, this energy transfer rate is comparable with the mean flow kinetic energy normalized to the correlation time of turbulence, implying that this energy transfer is significant. These results show, for the first time, the dual role of turbulence as a damping (eddy viscosity) and driving of flows in fusion plasmas emphasizing the important role of turbulence to understand perpendicular dynamics in the plasma boundary region of fusion plasmas.
dcterms:title
On the energy transfer between flows and turbulence in the plasma boundary of fusion devices On the energy transfer between flows and turbulence in the plasma boundary of fusion devices Přenos energie mezi toky v plazmatu a turbulencí na okraji fúzních zařízení
skos:prefLabel
Přenos energie mezi toky v plazmatu a turbulencí na okraji fúzních zařízení On the energy transfer between flows and turbulence in the plasma boundary of fusion devices On the energy transfer between flows and turbulence in the plasma boundary of fusion devices
skos:notation
RIV/61389021:_____/05:00029733!RIV06-AV0-61389021
n4:strany
296;300
n4:aktivita
n5:Z
n4:aktivity
Z(AV0Z20430508)
n4:cisloPeriodika
-
n4:dodaniDat
n10:2006
n4:domaciTvurceVysledku
n14:7403984
n4:druhVysledku
n16:J
n4:duvernostUdaju
n8:S
n4:entitaPredkladatele
n13:predkladatel
n4:idSjednocenehoVysledku
534466
n4:idVysledku
RIV/61389021:_____/05:00029733
n4:jazykVysledku
n17:eng
n4:klicovaSlova
radial electric fields; turbulence; fluctuations; Langmuir probe; JET
n4:klicoveSlovo
n9:JET n9:fluctuations n9:Langmuir%20probe n9:radial%20electric%20fields n9:turbulence
n4:kodStatuVydavatele
NL - Nizozemsko
n4:kontrolniKodProRIV
[6ECC30E5E859]
n4:nazevZdroje
Journal of Nuclear Materials
n4:obor
n12:BL
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
7
n4:rokUplatneniVysledku
n10:2005
n4:svazekPeriodika
337-339
n4:tvurceVysledku
Sánchez, E. Goncalves, B. Hidalgo, C. Silva, C. Erents, K. Hron, Martin Pedrosa, M. A.
n4:zamer
n7:AV0Z20430508
s:issn
0022-3115
s:numberOfPages
5