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Your search keyword '"Van Oost, G."' showing total 7 results
Start Over Author "Van Oost, G." Journal physical review letters
7 results on '"Van Oost, G."'

1. Experimental Evidence for the Intimate Interaction among Sheared Flows, Eddy Structures, Reynolds Stress, and Zonal Flows across a Transition to Improved Confinement

Author

Shesterikov, I, Xu, Y, Tynan, GR, Diamond, PH, Jachmich, S, Dumortier, P, Vergote, M, Van Schoor, M, Van Oost, G, and Team, TEXTOR

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

Dedicated experiments have been carried out at the TEXTOR tokamak in biasing-induced improved confinement regimes using Langmuir probe and GPI measurements. The results show the first evidence for the intimate interaction among sheared flows, eddy structures, Reynolds stress, zonal flows, and ambient fluctuations during a transition to an improved confinement. The sheared flows impose dynamic effects on turbulence structures, resulting in generation of Reynolds stress and zonal flows and eventually the suppression of background fluctuation levels via nonlinear energy transfer processes. The latter may therefore trigger a transition to the H mode. © 2013 American Physical Society.

Published
2013

2. High Confinement and High Density with Stationary Plasma Energy and Strong Edge Radiation in the TEXTOR-94 Tokamak

Author

Giuseppe Telesca, R. J. E. Jaspers, P. E. Vandenplas, F. Durodié, Juergen Rapp, C. Königs, B. Unterberg, R. Uhlemann, J. Ongena, A.I. Lyssoivan, H. Euringer, G.H. Wolf, G. Mank, M. Z. Tokar, H. R. Koslowski, G. Fuchs, U. Samm, A. Krämer-Flecken, B. Giesen, van Wassenhove G, G. Waidmann, Pierre Dumortier, G. Bonheure, G. Bertschinger, M. Vervier, J. Winter, N. Schoon, K.H. Finken, L. Könen, A. M. Messiaen, R.R. Weynants, Van Oost G, and R. Koch

Subjects
Physics, Tokamak, Radiative cooling, General Physics and Astronomy, Effective radiated power, Fusion power, Radiation, law.invention, Physics::Plasma Physics, law, Impurity, Atomic physics, Transformer, Scaling
Abstract

Stationary high energy confinement is observed on TEXTOR-94 for times limited only by the flux swing of the transformer using strong edge radiation cooling. Necessary tools are the feedback control of the radiated power and of the plasma energy content. At the highest densities obtained (up to 1.2 times the Greenwald limit), energy confinement exceeds the edge-localized-mode-free H-mode scaling ITERH93-P by more than 20%. beta limits of TEXTOR-94 are reached with f(H89)/q(a) approximate to 0.6 No detrimental effect of the seeded impurity is seen. These high confinement discharges meet many conditions necessary for a fusion reactor regime.

Published
1996
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3. Poloidal Rotation Dynamics, Radial Electric Field, and Neoclassical Theory in the Jet Internal-Transport-Barrier Region

Author

Crombé, K., primary, Andrew, Y., additional, Brix, M., additional, Giroud, C., additional, Hacquin, S., additional, Hawkes, N. C., additional, Murari, A., additional, Nave, M. F. F., additional, Ongena, J., additional, Parail, V., additional, Van Oost, G., additional, Voitsekhovitch, I., additional, and Zastrow, K.-D., additional

Published
2005
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4. Toroidal Plasma Rotation Induced by the Dynamic Ergodic Divertor in the TEXTOR Tokamak

Author

Finken, K. H., primary, Abdullaev, S. S., additional, de Bock, M. F. M., additional, von Hellermann, M., additional, Jakubowski, M., additional, Jaspers, R., additional, Koslowski, H. R., additional, Krämer-Flecken, A., additional, Lehnen, M., additional, Liang, Y., additional, Nicolai, A., additional, Wolf, R. C., additional, Zimmermann, O., additional, de Baar, M., additional, Bertschinger, G., additional, Biel, W., additional, Brezinsek, S., additional, Busch, C., additional, Donné, A. J. H., additional, Esser, H. G., additional, Farshi, E., additional, Gerhauser, H., additional, Giesen, B., additional, Harting, D., additional, Hoekzema, J. A., additional, Hogeweij, G. M. D., additional, Hüttemann, P. W., additional, Jachmich, S., additional, Jakubowska, K., additional, Kalupin, D., additional, Kelly, F., additional, Kikuchi, Y., additional, Kirschner, A., additional, Koch, R., additional, Korten, M., additional, Kreter, A., additional, Krom, J., additional, Kruezi, U., additional, Lazaros, A., additional, Litnovsky, A., additional, Loozen, X., additional, Lopes Cardozo, N. J., additional, Lyssoivan, A., additional, Marchuk, O., additional, Matsunaga, G., additional, Mertens, Ph., additional, Messiaen, A., additional, Neubauer, O., additional, Noda, N., additional, Philipps, V., additional, Pospieszczyk, A., additional, Reiser, D., additional, Reiter, D., additional, Rogister, A. L., additional, Sakamoto, M., additional, Savtchkov, A., additional, Samm, U., additional, Schmitz, O., additional, Schorn, R. P., additional, Schweer, B., additional, Schüller, F. C., additional, Sergienko, G., additional, Spatschek, K. H., additional, Telesca, G., additional, Tokar, M., additional, Uhlemann, R., additional, Unterberg, B., additional, Van Oost, G., additional, Van Rompuy, T., additional, Van Wassenhove, G., additional, Westerhof, E., additional, Weynants, R., additional, Wiesen, S., additional, and Xu, Y. H., additional

Published
2005
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5. High Confinement and High Density with Stationary Plasma Energy and Strong Edge Radiation in the TEXTOR-94 Tokamak

Author

Messiaen, A. M., primary, Ongena, J., additional, Samm, U., additional, Unterberg, B., additional, Van Wassenhove, G., additional, Durodie, F., additional, Jaspers, R., additional, Tokaŕ, M. Z., additional, Vandenplas, P. E., additional, Van Oost, G., additional, Winter, J., additional, Wolf, G. H., additional, Bertschinger, G., additional, Bonheure, G., additional, Dumortier, P., additional, Euringer, H., additional, Finken, K. H., additional, Fuchs, G., additional, Giesen, B., additional, Koch, R., additional, Könen, L., additional, Königs, C., additional, Koslowski, H. R., additional, Krämer-Flecken, A., additional, Lyssoivan, A., additional, Mank, G., additional, Rapp, J., additional, Schoon, N., additional, Telesca, G., additional, Uhlemann, R., additional, Vervier, M., additional, Waidmann, G., additional, and Weynants, R. R., additional

Published
1996
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6. Resonant coupling of ion-cyclotron waves to energetic helium ions

Author

Finken, K. H., primary, Koch, R., additional, Euringer, H., additional, Van Wassenhove, G., additional, Boedo, J. A., additional, Gray, D. S., additional, Hillis, D. L., additional, Huet, P., additional, Mank, G., additional, Van Eester, D., additional, Van Nieuwenhoven, R., additional, Van Oost, G., additional, and Tammen, H. F., additional

Published
1994
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7. Suppression of temperature fluctuations and energy barrier generation by velocity shear

Author

Boedo JA, Terry PW, Gray D, Ivanov RS, Conn RW, Jachmich S, and Van Oost G

Abstract

First measurements of temperature fluctuations in a region of high velocity shear show that absolute and normalized fluctuation levels are reduced across the shear layer, a result that is consistent with weak parallel electron thermal conduction in the electron temperature dynamics. The concomitant reduction of temperature, density, and electric field fluctuations reduces the anomalous conducted and convected heat fluxes.

Published
2000
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