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Experimental determination of the transient transport and of fluctuations relevant to transport in ASDEX

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dc.contributor.authorNiedermeyer, H.
dc.contributor.authorDodel, G.
dc.contributor.authorHendler, M.
dc.contributor.authorFussmann, G.
dc.contributor.authorGehre, O.
dc.contributor.authorGentile, K.W.
dc.contributor.authorGiannone, L.
dc.contributor.authorHolzhauer, E.
dc.contributor.authorKrieger, K.
dc.contributor.authorRudyj, A.
dc.contributor.authorTheimer, G.
dc.contributor.authorBengtson, R.D.
dc.contributor.authorCarlson, A.
dc.contributor.authorEberhagen, A.
dc.contributor.authorEngelhardt, W.
dc.contributor.authorGernhardt, J.
dc.contributor.authorGruber, O.
dc.contributor.authorHofmann, J.V.
dc.contributor.authorKarger, F.
dc.contributor.authorKluber, O.
dc.contributor.authorKramer, M
dc.contributor.authorManso, M.E.
dc.contributor.authorMatias, José
dc.date.accessioned2013-12-19T12:34:16Z
dc.date.available2013-12-19T12:34:16Z
dc.date.issued1990
dc.description.abstractParticle transport was studied in ASDEZ with modulated puffing of the discharge gas and of impurities. The energy transport is investigated by numerical simulation of the heat pulse after the swatooth crash. Small scale density fluctuations are investigated in the confinement region with far infrared scattering and reflectometry and in the edge plasma with langmuir probes and Ha diagnostic. In addition to a diffuse component of the particle transport, a strong inward drift is observed in all discharges. In ohmic discharges the transport coefficients decrease and saturate like 1/TE with increasing density. They are smaller in deuterium that in hydrogen. In the improved ohmic confinement (IOC)regime mainly D in the outer region is reduced. D increases proportionally to the heating power in L-mode discharges. The improvement of particle confinement in the H-mode is explained by a increase of the inward drift at the edge rather than a decrease of D. The impurity diffusion coefficient is independent of the impurity mass and charge. In ohmic discharges, it varies with ne like the bulk diffusion coefficient, is independent of B or increases weakly with B and increases with Ip. In L-mode discharges, Dimp increases linearly with the heating power. The electron thermal condustivity determined by heat pulse propagation exceeds the stationary value by a factor of 3-4, assuming merely diffusive heat transport. Convection does not significantly reduce this factor. however, non-diagonal terms.por
dc.identifier.citationNiedermeyer, H.; Dodel, G.; Hendler, M.; Fussmann, G.; Gehre, O.; Gentile, K.W.; Giannone, L.; Holzhauer, E.; Krieger, K.; Rudyj, A.; Theimer, G.; Bengtson, R.D.; Carlson, A.; Eberhagen, A.; Engelhardt, W.; Gernhardt, J.; Gruber, O.; Hofmann, J.V.; Karger, F.; Kluber, O.; Kramer, M; Manso, M.E.; Matias, José (1990). Experimental determination of the transient transport and of fluctuations relevant to transport in ASDEX. In 13th International Conference on Plasma Physics and Controlled Nuclear Fusion. Washington D.C, Estados Unidos da Américapor
dc.identifier.urihttp://hdl.handle.net/10198/9034
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherInternational Atomic Energy Agencypor
dc.titleExperimental determination of the transient transport and of fluctuations relevant to transport in ASDEXpor
dc.typeconference object
dspace.entity.typePublication
oaire.citation.conferencePlaceWashington D.C, Estados Unidos da Américapor
oaire.citation.endPage151por
oaire.citation.startPage141por
oaire.citation.title13th International Conference on Plasma Physics and Controlled Nuclear Fusionpor
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor

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