|Title||Overview of experiments with radiation cooling at high confinement and high density in limited and diverted discharges|
|Publication Type||Journal Article|
|Year of Publication||1999|
|Authors||J. Ongena, A.M Messiaen, B. Unterberg, R.V Budny, C.E Bush, K. Hill, G.T Hoang, G. Jackson, A. Kallenbach, P. Monier-Garbet, D. Mueller, M. Murakami, G. Staebler, F. Ryter, M. Wade, M. Bell, J. Boedo, G. Bonheure, P. Dumortier, F. Durodie, K.H. Finken, G. Fuchs, B. Giesen, P. Hutteman, R. Jaspers, R. Koch, A. Kramer-Flecken, P. Mertens, R. Moyer, A. Pospieszczyk, A. Ramsey, U. Samm, M. Sauer, B. Schweer, R. Uhlemann, P.E Vandenplas, G. Van Oost, M. Vervier, G. van Wassenhove, G. Waidmann, R.R Weynants, G.H Wolf, ASDEX Upgrade Team, DIII-D Team, TEXTOR team, Tftr Team, TTore Supra|
|Journal||Plasma Physics and Controlled Fusion|
An overview is presented of recent experiments with radiating mantles on limiter and divertor machines, realizing simultaneously high confinement and high density at high-radiation levels. A variety of operational regimes has been observed and the characteristics of each are documented. High-performance plasmas (i.e. edge localized mode (ELM)-free H-mode confinement quality f(H93) greater than or equal to 1 and normalized beta values beta(n) greater than or equal to 2 simultaneously) with radiating mantles have been demonstrated under quasistationary conditions during the maximum flattop time of the machine (equal to tens of confinement times) on DIII-D and TEXTOR-94. Maximum values for beta(n) up to 4 and for the advanced tokamak confinement-stability product beta(n) x f(L89) up to 13, have been obtained in very high confinement mode (VH-mode) like discharges with radiating mantles in DIII-D. There is a striking similarity between improved ohmic confinement discharges (with or without Ne seeding) and radiating mantle discharges, indicating a possible common origin for the confinement improvement observed. Possible scenarios for the application of radiating mantles on larger machines such as JET and JT-60U are indicated.
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