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Ohmic plasma particle confinement times are controlled during magnetic perturbation and stochastic boundary layer experiments in Tore Supra with small currents in the ergodic divertor coils. Particle confinement may be improved or degraded, depending on the plasma configuration and base parameters used. The magnitude of these steady state confinement changes is controlled by changing I(ed) and the base plasma parameters. Plasma confinement changes manifest either density increase with a reduction in the wall fuelling flux, or density decrease with an increase in the fuelling flux, depending on the geometric configuration. In addition, the effective thermal insulation of the boundary layer is controlled. T(e) and deltaT(e) are decreased as expected, and notable reductions in the ratio of deltan(e) to n(e) are observed in the improved performance configurations. Impurity and radiated power profiles are readily modified in the boundary layer.

Additional information

Authors: GUILHEM D ET AL., CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR);EVANS T E ET AL., General Atomics, San Diego (US);MIODUSZEWSKI P K ET AL., Oak Ridge National Laboratory, Oak Ridge (US)
Bibliographic Reference: Report: EUR-CEA-FC-1419 EN (1991) 88 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199110890 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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