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(CT/P-02) A Two-term Model of the Confinement in ELMy H-modes Using the Global Confinement and Pedestal Databases

J.G. Cordey1), J.A. Snipes2), M. Greenwald2), A. Hubbard2), F. Ryter3), O.J.W.F. Kardaun3), J. Stober3), W. Suttrop3), L.D. Horton3), M. Valovic1), S.J. Fielding1), A. Sykes1), A. Dnestrovskij1), M. Walsh1, J.C. DeBoo4), T.N. Carlstrom4), T.H. Osborne4), G. Bracco5), E. Righi6), K. Thomsen6), D. McDonald6), Y. Miura7), T. Takizuka7), T. Fukuda7), Y. Kamada7), K. Shinohara7), K. Tsuzuki7), H. Urano7), T. Hatae7), S.M. Kaye8), C. Bush9), Y. Martin10), A. Cote11), G. Pacher11), J. Ongena12), S. Lebedev13), A. Chudnovskiy14), M. Sugihara15), G. Janeschitz16)
1) UKAEA Association Euratom, Culham, UK
2) MIT Plasma Science and Fusion Center, Cambridge, MA, USA.
3) Max-Planck Inst. für Plasmaphysik, Garching
4) General Atomics, San Diego, CA, USA
5) Associazione Euratom-ENEA sulla fusione, Frascati, Italy
6) EFDA-JET, Culham, UK or Garching, Germany
7) Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, Japan
8) Princeton Plasma Physics Laboratory, Princeton, NJ, USA
9) Oak Ridge National Laboratory, Oak Ridge, TN, USA
10) EPFL/CRPP Association Euratom, Lausanne, Switzerland
11) Centre Canadien de Fusion Magnetique, Varennes, Quebec, Canada
12) LPP/ERM-KMS, Association EURATOM-Belgian State, Brussels, Belgium
13) A F Ioffe Institute, Russian Academy of Sciences, St Petersburg, Russia
14) Nuclear Fusion Institute, Russian Research Centre Kurchatov Institute, Moscow, Russia
15) ITER Joint Work Site, Naka, Japan.
16) FZK-PL-Fusion, Karlsruhe, Germany

Abstract.  The ITPA Confinement and Pedestal Database groups have joined forces to assemble a common database of pulses containing both pedestal and core energy data. The scaling of the pedestal energy with respect to both the engineering parameters current, power, major radius etc. and the dimensionless physics parameters, normalised Larmor radius, collisionality etc. has been determined. The large ELMy H-mode database is then used to determine the scaling of the core plasma which is found to be approximately pure gyro-Bohm. A two term model consisting of both a core and pedestal contribution is developed, which is found to fit the data as well as the conventional one term model. Predictions for the energy content of the pedestal and core in ITER are presented.

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IAEA 2003