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(EX/P5-07) Parameter Similarity Studies in JET, ASDEX Upgrade and ALCATOR C-Mod

W.A. Suttrop1), L.D. Horton2), A.E. Hubbard2), D. McDonald3), R. Barnsley3), M. Beurskens4), P. Bonoli2), J.-M. Chareau5), J.G. Cordey3), J.W. Hughes2), P.J. Lomas3), G. Maddison3), A. Meigs3), F. Meo1), D. Mossessian2), R. Neu1), J.-M. Noterdaeme1), V.V. Parail3), F. Ryter1), J. Schweinzer1), M. Stamp3), J.D. Strachan6), J. Stober1), S. Wukitch2), ASDEX Upgrade Team, ALCATOR C-Mod Team, JET EFDA Contributors7)
1) Max Planck Institut für Plasmaphysik, Garching, Germany
2) Plasma Science and Fusion Center, M.I.T., Cambridge, Mass., U.S.A.
3) UKAEA Fusion, Culham Laboratory, Euratom Association, Abingdon, U.K.
4) FOM Instituut voor Plasmafysica ``Rijnhuizen'', EURATOM Association, Trilateral Euregio Cluster, Nieuwegein, The Netherlands
5) Association EURATOM/CEA Cadarache, DRFC, Saint-Paul-Lez-Durance, France
6) Princeton Plasma Physics Laboratory, Princeton University, New Jersey, U.S.A.
7) see Annex, J. Pamela, Proc. IAEA Conf. on Fusion Energy, Lyon 2002, OV/1-4

Abstract.  Similarity plasmas are studied in JET, ASDEX Upgrade and ALCATOR C-Mod to test the validity of dimensional constraints for core profiles and profiles at the plasma edge in H-modes with and without large dge Localised Modes and at the H-mode transition. Core and H-mode edge profiles in the studied comparison pairs of pulses match within uncertainties. Identical scaled H-mode threshold and edge MHD behaviour is obtained in JET and ASDEX Upgrade for same edge $ \rho^{\ast}$, $ \nu^{\ast}$ and $ \beta$. In contrast, constant edge temperature, required for identity of atomic cross sections, does not describe operational regime boundaries in the two machines. First attempts have been made to reproduce ALCATOR C-Mod EDA-mode plasmas in ASDEX Upgrade; the results of the best matches obtained are reported.

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IAEA 2003