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Ph. Ghendrih, M. Becoulet, P. Beyer*,
X. Garbet, A. Grosman, S. Feron, F. Laugier,
J. Gunn, B. Meslin, P. Monier-Garbet, C. Grisolia,
T. Loarer, R. Guirlet
Association Euratom-CEA, DRFC, CEA Cadarache, 13108 St Paul
lez Durance, France
* present address: Equipe Turbulence Plasma, LPIIM, Centre
Universitaire de Saint-Jérôme, Marseille, France
Abstract. Ergodic divertor experiments on Tore Supra provide evidence of
significant control of plasma-wall interaction. Theoretical investigation of
the laminar region (i.e. governed by parallel transport) indicates that
control of the plasma state at the target plate can be achieved with plasma
states similar to that observed with the axisymmetric divertor. Analysis of
the temperature field with a 2-D test particle code allows one to recover the
observed spatial modulation and shows that an intrinsic barrier appears to
develop at the separatrix. Energy deposition peaking, analysed with a 3-D
code, is strongly reduced when moderate transverse transport is
considered. Possible control of upstream parameters can thus be achieved in
the ergodic region, for instance a lowering of the parallel energy flux by
cross field transport.
IAEA 2001
