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Abstract

The international Tokamak Physics Activity (ITPA) L-mode database has been augmented with several new contributions since the previous release of an L-mode scaling expression. Among the issues that this database allows us to address, the scaling of the energy confinement time with dimensionless parameters (roh*, beta, v*) is of physical importance and of some interest for extrapolation to Next Step machines. Recently, this scaling has been revisited for the H-mode regime, following dimensionless scaling experiments on JET and DIII-D which showed a weak impact of beta on the confinement, in contrast to the strong beta degradation featured by the IPB98(y, 2) scaling expression. It has been found that including the errors on the experimental measurement in the analysis could change the beta-dependence of the scaling expression: the exponent of the beta-dependence can be reduced down to a negligible value, while at the same time a degradation with the effective collisionality v* appears. In this work, the same statistical methods are applied to the new version of the L-mode database, in order to investigate the possible changes on the beta-dependence of the L-mode scaling expression.

Additional information

Authors: ELBEZE D, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);IMBEAUX F, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ANIEL T, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);HOANG G T, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ONGENA J, Association EURATOM-Belgian State, LPP-ERM/KMS (BE);CORDEY G, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);MCDONALD D, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);VALOVIC M, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);AKERS R, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB)
Bibliographic Reference: An oral paper given at: 32nd EPS Conference on Controlled Fusion and Plasma Physics Organised by: Asociación EURATOM-CIEMAT para Fusión Held at: Congress Palace of Tarragona, Tarragona (ES)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, FranceL%Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
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