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Abstract

Impurities are injected into JET and Tore Supra by the laser blow-off ablation technique for a variety of experimental situations. The impurity confinement times tau(p), which reflect the impurity transport, have been measured by fitting exponential curves to the decays of the central brightnesses. Two data-bases are built up including ohmic and L-mode discharges with the aim of determining a tau(p) scaling law common to both devices. The best monomial scaling law is chosen on the basis of minimisation of the standard deviation of the individual regressions. Impurity confinement times are compared to the energy confinement times tau(E) for the same data. The energy confinement times are larger than the impurity confinement times, the average ratio tau(E)/tau(p) being approximately 2.5.

Additional information

Authors: MATTIOLI M ET AL., CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);GIANNELLA R ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);MYRNÄS R, University of Lund, Department of Physics (SE);MYRNAS R, University of Lund, Department of Physics (SE)
Bibliographic Reference: Report: EUR-CEA-FC-1535 EN (1995) 23 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
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