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          Institute: MPI für Plasmaphysik     Collection: Conference Papers     Display Documents

ID: 56156.0, MPI für Plasmaphysik / Conference Papers
Characteristics of the H-mode pedestal and extrapolation to ITER
Authors:Osborne, T. H.; Cordey, J. G.; Groebner, R. J.; Hatae, T.; Hubbard, A.; Horton, L. D.; Kamada, Y.; Kritz, A.; Lao, L. L.; Leonard, A. W.; Loarte, A.; Mahdavi, M. A.; Mossessian, D.; Onjun, T.; Ossenpenko, M.; Rognlien, T. D.; Saibene, G.; Snyder, P. B.; Sugihara, M.; Shurygin, R.; Thomsen, K.; Wade, M. R.; Wilson, H. R.; Xu, X. Q.; Yatsu, K.; International Tokamak Physics Activity H Mode Pedestal Working Group
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:CT-3
Physical Description:CD-ROM
Name of Conference/Meeting:19th Fusion Energy Conference
Place of Conference/Meeting:Lyon (FR)
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description:The development of a predictive capability for the characteristics of the H-mode pedestal and ELMs is important in predicting tokamak reactor performance. The H-mode pedestal effects core confinement through temperature profile stiffness. The ELM power flux can significantly impact divertor design. We discuss progress in these areas through inter-machine comparison under the venue of the International Tokamak Physics Activity, ITPA. The pressure in the H-mode transport barrier region is typically set by the ELM cycle rather than transport. Several features of the ELM onset conditions are consistent with an ideal peeling-ballooning mode instability: 1) strong shape dependence, 2) mode structure, 3) reduced p' at high collisionality, 4) p' dependence on transport barrier width. Type I ELM energy loss is found to be proportional to the energy in the H-mode pedestal. There is some consistency between the peeling-ballooning mode radial width and the ELM size. Type I ELM energy loss is reduced at high density to levels that would be tolerable in a reactor scale device through reduced conductive loss and possibly shift to a more radially localized instability.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E1
External Affiliations:General Atomics, San Diego, CA, USA; EURATOM/UKAEA Fusion Association, Culham Science Center, Abingdon, United Kingdom ; Japan Atomic Energy Research Institute, Naka-machi, Ibaraki-ken, Japan ; Massachusetts Institute of Technology, Cambridge, Massachusetts USA; Lehigh University, Bethlehem, Pennsylvania USA; EFDA-JET, Culham, United Kingdom; Institute of Nuclear Fusion, Kurchatov Institute, Russia; Lawrence Livermore National Laboratory, Livermore, California, USA; ITER Joint Work Site, Naka, Japan; Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA; Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, Japan
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